bug 259768: "Use optimal jobs number" highly misleading.

Encode "optimal" as negative number and "unlimited" as Integer.MAX_VALUE
Based on patch by Mohamed Hussein <mohamed_hussein@mentor.com>

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/core/IBuilder.java

@@ -76,12 +76,15 @@ public interface IBuilder extends IHoldsOptions, IMakeBuilderInfo {
 	static final String ATTRIBUTE_CUSTOMIZED_ERROR_PARSERS = "customizedErrorParsers"; //$NON-NLS-1$
 	static final String ATTRIBUTE_CUSTOM_PROPS = "customBuilderProperties"; //$NON-NLS-1$
 
-//	static final String ATTRIBUTE_CUSTOMIZED_ERROR_PARSERS = "customizedErrorParsers"; //$NON-NLS-1$
-
 	static final String ATTRIBUTE_IGNORE_ERR_CMD = "ignoreErrCmd"; //$NON-NLS-1$
 	static final String ATTRIBUTE_STOP_ON_ERR = "stopOnErr"; //$NON-NLS-1$
+	
 	static final String ATTRIBUTE_PARALLEL_BUILD_CMD = "parallelBuildCmd"; //$NON-NLS-1$
 	static final String ATTRIBUTE_PARALLELIZATION_NUMBER = "parallelizationNumber"; //$NON-NLS-1$
+	/** @since 8.1 */
+	static final String VALUE_OPTIMAL = "optimal"; //$NON-NLS-1$
+	/** @since 8.1 */
+	static final String VALUE_UNLIMITED = "unlimited"; //$NON-NLS-1$
 	static final String ATTRIBUTE_PARALLEL_BUILD_ON = "parallelBuildOn"; //$NON-NLS-1$
 	static final String PARALLEL_PATTERN_NUM = "*"; //$NON-NLS-1$
 	static final String PARALLEL_PATTERN_NUM_START = "["; //$NON-NLS-1$
@@ -92,15 +95,9 @@ public interface IBuilder extends IHoldsOptions, IMakeBuilderInfo {
 	static final String DEFAULT_TARGET_INCREMENTAL = "all";  //$NON-NLS-1$
 	static final String DEFAULT_TARGET_CLEAN = "clean";  //$NON-NLS-1$
 	static final String DEFAULT_TARGET_AUTO = "all"; //$NON-NLS-1$
-	
+	/** @since 6.0 */
-	/**
-	 * @since 6.0
-	 */
 	static final String ATTRIBUTE_COMMAND_LAUNCHER = "commandLauncher"; //$NON-NLS-1$
-
+	/** @since 8.0 */
-	/**
-	 * @since 8.0
-	 */
 	static final String ATTRIBUTE_BUILD_RUNNER = "buildRunner"; //$NON-NLS-1$
 	
 	/**

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/core/IMultiConfiguration.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2007, 2010 Intel Corporation and others.
+ * Copyright (c) 2007, 2011 Intel Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -13,19 +13,62 @@ package org.eclipse.cdt.managedbuilder.core;
 import org.eclipse.cdt.core.settings.model.ICMultiItemsHolder;
 import org.eclipse.cdt.managedbuilder.buildproperties.IBuildProperty;
 import org.eclipse.cdt.managedbuilder.buildproperties.IBuildPropertyValue;
+import org.eclipse.cdt.managedbuilder.internal.core.Builder;
+import org.eclipse.cdt.newmake.core.IMakeCommonBuildInfo;
 
 /**
+ * This class is to combine multiple configurations to one to support
+ * selection of multiple configurations on property pages.
+ * 
  * @noextend This class is not intended to be subclassed by clients.
  * @noimplement This interface is not intended to be implemented by clients.
  */
 public interface IMultiConfiguration extends IConfiguration, ICMultiItemsHolder {
 	
+	/**
+	 * Check if the configuration's builder is operating in parallel mode.
+	 * @return {@code true} if parallel mode is enabled, {@code false} otherwise.
+	 */
 	boolean getParallelDef();
-	void    setParallelDef(boolean def);
+	/**
+	 * Set parallel execution mode for the configuration's builder.
+	 * @see Builder#setParallelBuildOn(boolean)
+	 * 
+	 * @param parallel - the flag to enable or disable parallel mode.
+	 */
+	void setParallelDef(boolean parallel);
 
+	/**
+	 * Returns maximum number of parallel threads/jobs used by the configuration's builder.
+	 * Note that this function can return negative value to indicate  "optimal" number.
+	 * 
+	 * @see #setParallelDef(boolean)
+	 * @see Builder#getParallelizationNum()
+	 * 
+	 * @return - maximum number of parallel threads or jobs used by the builder or negative number.
+	 *    For exact interpretation see table in {@link IMakeCommonBuildInfo#getParallelizationNum()}
+	 */
 	int getParallelNumber();
-	void    setParallelNumber(int num);
+	/**
+	 * Sets maximum number of parallel threads/jobs to be used by builder.
+	 * Note that the number will be set only if the builder is in "parallel"
+	 * mode.
+	 * 
+	 * @param jobs - maximum number of jobs or threads. If the number is 0
+	 *    or negative, negative "optimal" number will be set, see
+	 *    {@link Builder#getOptimalParallelJobNum()}.
+	 */
+	void setParallelNumber(int jobs);
 	
+	/**
+	 * returns the Internal Builder parallel mode
+	 * if true, internal builder will work in parallel mode 
+	 * otherwise it will use only one thread
+	 * @return boolean
+	 * 
+	 * @deprecated since CDT 9.0. Use {@link #getParallelDef()}
+	 */
+	@Deprecated
 	boolean getInternalBuilderParallel();
 
 	boolean isInternalBuilderEnabled();

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/core/InternalBuildRunner.java

@@ -65,7 +65,7 @@ public class InternalBuildRunner extends AbstractBuildRunner {
 	public boolean invokeBuild(int kind, IProject project, IConfiguration configuration,
 			IBuilder builder, IConsole console, IMarkerGenerator markerGenerator,
 			IncrementalProjectBuilder projectBuilder, IProgressMonitor monitor) throws CoreException {
-		boolean isParallel = builder.isParallelBuildOn() && builder.getParallelizationNum() > 1;
+		boolean isParallel = Math.abs(builder.getParallelizationNum()) > 1;
 //		boolean buildIncrementaly = true;
 		boolean resumeOnErr = !builder.isStopOnError();
 

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/buildmodel/BuildProcessManager.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2006, 2007 Intel Corporation and others.
+ * Copyright (c) 2006, 2011 Intel Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -11,10 +11,6 @@
 
 package org.eclipse.cdt.managedbuilder.internal.buildmodel;
 
-import java.io.BufferedReader;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;
@@ -23,9 +19,6 @@ import java.util.Map.Entry;
 import java.util.Set;
 
 import org.eclipse.cdt.managedbuilder.buildmodel.IBuildCommand;
-import org.eclipse.cdt.managedbuilder.core.ManagedBuildManager;
-import org.eclipse.cdt.managedbuilder.envvar.IBuildEnvironmentVariable;
-import org.eclipse.cdt.managedbuilder.envvar.IEnvironmentVariableProvider;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
 
@@ -42,11 +35,6 @@ public class BuildProcessManager {
 	protected ProcessLauncher[] processes;
 	protected int maxProcesses;  
 	
-//	 Number of CPUs is not dependent of object instance.
-//   But user can change UI settings for processes number.
-//   So we cannot set procNumber directly to maxProcesses. 	
-	static int procNumber = 0;
-	
 	/**
 	 * Initializes process manager
 	 * 
@@ -152,40 +140,10 @@ public class BuildProcessManager {
 	
 	/**
 	 * @return Number of processors detected
+	 * @deprecated since CDT 9.0 - just use Runtime.getRuntime().availableProcessors()
 	 */
+	@Deprecated
 	static public int checkCPUNumber() {
-		if (procNumber > 0) return procNumber;
+		return Runtime.getRuntime().availableProcessors();
-		
-		procNumber = 1;
-		int x = 0;
-		String os = System.getProperty("os.name"); //$NON-NLS-1$
-		if (os != null) {
-			if (os.startsWith("Win")) { //$NON-NLS-1$
-				IEnvironmentVariableProvider evp = ManagedBuildManager.getEnvironmentVariableProvider();
-				if (evp != null) {
-					IBuildEnvironmentVariable var = evp.getVariable("NUMBER_OF_PROCESSORS", null, false, false); //$NON-NLS-1$
-					if (var != null) {
-						try {
-							x = new Integer(var.getValue()).intValue();
-							if (x > 0) { procNumber = x; }
-						} catch (NumberFormatException e) {} // fallthrough and return default
-					}
-				}
-			} else { // linux
-				String p = "/proc/cpuinfo"; //$NON-NLS-1$
-				try {
-					BufferedReader r = new BufferedReader(new InputStreamReader(new FileInputStream(p)));
-					String s;
-					while ((s = r.readLine() ) != null ) 
-					   { if (s.startsWith("processor\t:")) x++; } //$NON-NLS-1$
-					r.close();
-					if (x > 0) { procNumber = x; }
-				} 
-				catch (IOException e) {} // fallthrough and return default
-			}
-		}
-		if(DbgUtil.DEBUG)
-			DbgUtil.trace("Number of processors detected: " + procNumber);	//$NON-NLS-1$
-		return procNumber;
 	}
 }

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/buildmodel/ParallelBuilder.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2006 Intel Corporation and others.
+ * Copyright (c) 2006, 2011 Intel Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -91,6 +91,7 @@ public class ParallelBuilder {
 			return step.hashCode();
 		}
 		
+		@Override
 		public int compareTo(BuildQueueElement elem) {
 			if (elem == null)
 				throw new NullPointerException();
@@ -205,10 +206,7 @@ public class ParallelBuilder {
 		if(cwd == null)  cwd = des.getDefaultBuildDirLocation();
 		int threads = 1;
 		if (cfg instanceof Configuration) {
-			if (((Configuration)cfg).getParallelDef())
+			threads = Math.abs(((Configuration)cfg).getParallelNumber());
-				threads = BuildProcessManager.checkCPUNumber();
-			else
-				threads = ((Configuration)cfg).getParallelNumber();  
 		}
 		ParallelBuilder builder = new ParallelBuilder(cwd, dirs, out, err, monitor, resumeOnErrors, buildIncrementally);
 		builder.enqueueAll(des);

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Builder.java

@@ -40,10 +40,10 @@ import org.eclipse.cdt.core.settings.model.extension.CBuildData;
 import org.eclipse.cdt.core.settings.model.util.CDataUtil;
 import org.eclipse.cdt.core.settings.model.util.LanguageSettingEntriesSerializer;
 import org.eclipse.cdt.internal.core.SafeStringInterner;
+import org.eclipse.cdt.managedbuilder.core.AbstractBuildRunner;
 import org.eclipse.cdt.managedbuilder.core.BuildException;
 import org.eclipse.cdt.managedbuilder.core.ExternalBuildRunner;
 import org.eclipse.cdt.managedbuilder.core.IBuildObject;
-import org.eclipse.cdt.managedbuilder.core.AbstractBuildRunner;
 import org.eclipse.cdt.managedbuilder.core.IBuilder;
 import org.eclipse.cdt.managedbuilder.core.IConfiguration;
 import org.eclipse.cdt.managedbuilder.core.IManagedConfigElement;
@@ -64,6 +64,7 @@ import org.eclipse.cdt.managedbuilder.macros.IReservedMacroNameSupplier;
 import org.eclipse.cdt.managedbuilder.makegen.IManagedBuilderMakefileGenerator;
 import org.eclipse.cdt.managedbuilder.makegen.IManagedBuilderMakefileGenerator2;
 import org.eclipse.cdt.managedbuilder.makegen.gnu.GnuMakefileGenerator;
+import org.eclipse.cdt.newmake.core.IMakeCommonBuildInfo;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IncrementalProjectBuilder;
 import org.eclipse.core.runtime.CoreException;
@@ -79,7 +80,6 @@ import org.eclipse.core.variables.VariablesPlugin;
 import org.osgi.framework.Version;
 
 public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider<Builder>, IRealBuildObjectAssociation  {
-
 	private static final String EMPTY_STRING = ""; //$NON-NLS-1$
 
 	//  Superclass
@@ -119,10 +119,12 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 	private HashMap<String, String> customBuildProperties;
 //	private Boolean isWorkspaceBuildPath;
 	private String ignoreErrCmd;
-	private String parallelBuildCmd;
 	private Boolean stopOnErr;
-	private Integer parallelNum;
+	// parallelization
-	private Boolean parallelBuildOn;
+	private String parallelBuildCmd;
+	private Boolean isParallelBuildEnabled;
+	private Integer parallelJobsNumber; // negative number denotes "optimal" value, see getOptimalParallelJobNum()
+
 	private boolean isTest;
 	
 	//  Miscellaneous
@@ -327,9 +329,10 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		
 		stopOnErr = builder.stopOnErr;
 		ignoreErrCmd = builder.ignoreErrCmd;
+
+		isParallelBuildEnabled = builder.isParallelBuildEnabled;
+		parallelJobsNumber = builder.parallelJobsNumber;
 		parallelBuildCmd = builder.parallelBuildCmd;
-		parallelNum = builder.parallelNum;
-		parallelBuildOn = builder.parallelBuildOn;
 
 		if(builder.outputEntries != null){
 			outputEntries = builder.outputEntries.clone();
@@ -372,17 +375,15 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 			} catch (CoreException e) {
 			}
 		}
-		if(getParallelizationNum() != builder.getParallelizationNum()
+		if (isParallelBuildOn() != builder.isParallelBuildOn() && supportsParallelBuild()) {
-				&& supportsParallelBuild()){
 			try {
-				setParallelizationNum(builder.getParallelizationNum());
+				setParallelBuildOn(builder.isParallelBuildOn());
 			} catch (CoreException e) {
 			}
 		}
-		if(isParallelBuildOn() != builder.isParallelBuildOn()
+		if (getParallelizationNum() != builder.getParallelizationNum() && supportsParallelBuild()) {
-				&& supportsParallelBuild()){
 			try {
-				setParallelBuildOn(builder.isParallelBuildOn());
+				setParallelizationNum(builder.getParallelizationNum());
 			} catch (CoreException e) {
 			}
 		}
@@ -556,18 +557,18 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		if (tmp != null)
 			stopOnErr = Boolean.valueOf(tmp);
 
-        parallelBuildCmd = SafeStringInterner.safeIntern(element.getAttribute(ATTRIBUTE_PARALLEL_BUILD_CMD));
+		tmp = element.getAttribute(ATTRIBUTE_PARALLEL_BUILD_CMD);
-        
-        tmp = element.getAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER);
-        if(tmp != null){
-        	try {
-        		parallelNum = Integer.decode(tmp);
-        	} catch (NumberFormatException e){
-        	}
-        }
-        tmp = element.getAttribute(ATTRIBUTE_PARALLEL_BUILD_ON);
 		if (tmp != null)
-        	parallelBuildOn = Boolean.valueOf(tmp);
+			parallelBuildCmd = SafeStringInterner.safeIntern(tmp);
+
+		tmp = element.getAttribute(ATTRIBUTE_PARALLEL_BUILD_ON);
+		if (tmp != null) {
+			isParallelBuildEnabled = Boolean.valueOf(tmp);
+			if (isParallelBuildEnabled) {
+				tmp = element.getAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER);
+				decodeParallelizationNumber(element.getAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER));
+			}
+		}
 
 		// Get the semicolon separated list of IDs of the error parsers
 		errorParserIds = SafeStringInterner.safeIntern(element.getAttribute(IToolChain.ERROR_PARSERS));
@@ -618,6 +619,46 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 			fBuildRunnerElement = ((DefaultManagedConfigElement)element).getConfigurationElement();
 	}
 	
+	private String encodeParallelizationNumber(Integer jobsNumber) {
+		if (jobsNumber <= 0)
+			return VALUE_OPTIMAL;
+		
+		if (jobsNumber.equals(Integer.MAX_VALUE))
+			return VALUE_UNLIMITED;
+		
+		return jobsNumber.toString();
+	}
+
+	private void decodeParallelizationNumber(String value) {
+		if (VALUE_OPTIMAL.equals(value)) {
+			parallelJobsNumber = -getOptimalParallelJobNum();
+		} else if (VALUE_UNLIMITED.equals(value)) {
+			if (!isInternalBuilder()) {
+				parallelJobsNumber = Integer.MAX_VALUE;
+			} else {
+				ManagedBuilderCorePlugin.error("'unlimited' number of jobs is not allowed for Internal Builder, switching to 'optimal'");
+				parallelJobsNumber = -getOptimalParallelJobNum();
+			}
+		} else {
+			try {
+				parallelJobsNumber = Integer.decode(value);
+			} catch (NumberFormatException e) {
+				ManagedBuilderCorePlugin.log(e);
+				parallelJobsNumber = getOptimalParallelJobNum();
+			}
+			if (parallelJobsNumber <= 0) {
+				// compatibility with legacy representation - it was that inconsistent
+				if (isInternalBuilder()) {
+					// "optimal" for Internal Builder
+					parallelJobsNumber = -getOptimalParallelJobNum();
+				} else {
+					// unlimited for External Builder
+					parallelJobsNumber = Integer.MAX_VALUE;
+				}
+			}
+		}
+	}
+
 	/**
 	 * Initialize the builder information from the XML element 
 	 * specified in the argument
@@ -752,20 +793,18 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		if (tmp != null)
 			stopOnErr = Boolean.valueOf(tmp);
 
-        if(element.getAttribute(ATTRIBUTE_PARALLEL_BUILD_CMD) != null)
+		tmp = element.getAttribute(ATTRIBUTE_PARALLEL_BUILD_CMD);
-        	parallelBuildCmd = SafeStringInterner.safeIntern(element.getAttribute(ATTRIBUTE_PARALLEL_BUILD_CMD));
+		if (tmp != null)
-        
+			parallelBuildCmd = SafeStringInterner.safeIntern(tmp);
-        tmp = element.getAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER);
-        if(tmp != null){
-        	try {
-        		parallelNum = Integer.decode(tmp);
-        	} catch (NumberFormatException e){
-        	}
-        }
 
 		tmp = element.getAttribute(ATTRIBUTE_PARALLEL_BUILD_ON);
-        if(tmp != null)
+		if (tmp != null) {
-        	parallelBuildOn = Boolean.valueOf(tmp);
+			isParallelBuildEnabled = Boolean.valueOf(tmp);
+			if (isParallelBuildEnabled) {
+				tmp = element.getAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER);
+				decodeParallelizationNumber(element.getAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER));
+			}
+		}
 
         ICStorageElement[] children = element.getChildren();
         for(int i = 0; i < children.length; i++){
@@ -873,12 +912,15 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 			element.setAttribute(ATTRIBUTE_IGNORE_ERR_CMD, ignoreErrCmd);
 		if (stopOnErr != null)
 			element.setAttribute(ATTRIBUTE_STOP_ON_ERR, stopOnErr.toString());
+
 		if (parallelBuildCmd != null)
 			element.setAttribute(ATTRIBUTE_PARALLEL_BUILD_CMD, parallelBuildCmd);
-        if(parallelNum != null)
+
-        	element.setAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER, parallelNum.toString());
+		if (isParallelBuildEnabled != null)
-        if(parallelBuildOn != null)
+			element.setAttribute(ATTRIBUTE_PARALLEL_BUILD_ON, isParallelBuildEnabled.toString());
-        	element.setAttribute(ATTRIBUTE_PARALLEL_BUILD_ON, parallelBuildOn.toString());
+		if (isParallelBuildOn() && parallelJobsNumber != null)
+			element.setAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER, encodeParallelizationNumber(parallelJobsNumber));
+
 		// Note: build file generator cannot be specified in a project file because
 		//       an IConfigurationElement is needed to load it!
 		if (buildFileGeneratorElement != null) {
@@ -968,10 +1010,15 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		if (getIgnoreErrCmdAttribute() != null)
 			element.setAttribute(ATTRIBUTE_IGNORE_ERR_CMD, getIgnoreErrCmdAttribute());
 		element.setAttribute(ATTRIBUTE_STOP_ON_ERR, Boolean.valueOf(isStopOnError()).toString());
-        if(getParrallelBuildCmd() != null)
+
-        	element.setAttribute(ATTRIBUTE_PARALLEL_BUILD_CMD, getParrallelBuildCmd());
+		if (parallelBuildCmd != null)
-       	element.setAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER, new Integer(getParallelizationNumAttribute()).toString());
+			element.setAttribute(ATTRIBUTE_PARALLEL_BUILD_CMD, parallelBuildCmd);
-       	element.setAttribute(ATTRIBUTE_PARALLEL_BUILD_ON, Boolean.valueOf(isParallelBuildOn()).toString());
+
+		if (isParallelBuildEnabled != null)
+			element.setAttribute(ATTRIBUTE_PARALLEL_BUILD_ON, isParallelBuildEnabled.toString());
+		if (isParallelBuildOn() && parallelJobsNumber != null)
+			element.setAttribute(ATTRIBUTE_PARALLELIZATION_NUMBER, encodeParallelizationNumber(parallelJobsNumber));
+
 		// Note: build file generator cannot be specified in a project file because
 		//       an IConfigurationElement is needed to load it!
 		if (buildFileGeneratorElement != null) {
@@ -995,6 +1042,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 	 *  P A R E N T   A N D   C H I L D   H A N D L I N G
 	 */
 
+	@Override
 	public IToolChain getParent() {
 		return parent;
 	}
@@ -1003,6 +1051,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 	 *  M O D E L   A T T R I B U T E   A C C E S S O R S
 	 */
 
+	@Override
 	public IBuilder getSuperClass() {
 		return (IBuilder)superClass;
 	}
@@ -1012,6 +1061,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return (name == null && superClass != null) ? superClass.getName() : name;
 	}
 
+	@Override
 	public boolean isAbstract() {
 		if (isAbstract != null) {
 			return isAbstract.booleanValue();
@@ -1020,6 +1070,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		}
 	}
 
+	@Override
 	public String getUnusedChildren() {
 		if (unusedChildren != null) {
 			return unusedChildren;
@@ -1027,6 +1078,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 			return EMPTY_STRING;	// Note: no inheritance from superClass
 	}
 
+	@Override
 	public String getCommand() {
 		if (command == null) {
 			// If I have a superClass, ask it
@@ -1039,10 +1091,11 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return command;
 	}
 
+	@Override
 	public String getArguments() {
 		String args = getArgumentsAttribute(); 
 		String stopOnErrCmd = getStopOnErrCmd(isStopOnError());
-		String parallelBuildCmd = isParallelBuildOn() ? getParallelizationCmd(getParallelizationNum()) : EMPTY_STRING;
+		String parallelCmd = isParallelBuildOn() ? getParallelizationCmd(getParallelizationNum()) : EMPTY_STRING;
 		
 		String reversedStopOnErrCmd = getStopOnErrCmd(!isStopOnError());
 		String reversedParallelBuildCmd = !isParallelBuildOn() ? getParallelizationCmd(getParallelizationNum()) : EMPTY_STRING;
@@ -1051,7 +1104,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		args = removeCmd(args, reversedParallelBuildCmd);
 		
 		args = addCmd(args, stopOnErrCmd);
-		args = addCmd(args, parallelBuildCmd);
+		args = addCmd(args, parallelCmd);
 
 		return args != null ? args.trim() : null;
 	}
@@ -1121,10 +1174,19 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		}if(num == 0){
 			return EMPTY_STRING;
 		}
-		
+		// "unlimited" number of jobs results in not adding the number to parallelization cmd
-		return processParallelPattern(pattern, num < 0, num);
+		// that behavior corresponds that of "make" flag "-j".
+		return processParallelPattern(pattern, num == Integer.MAX_VALUE, Math.abs(num));
 	}
 	
+	/**
+	 * This method turns the supplied pattern to parallelization command
+	 * 
+	 * It supports 2 kinds of pattern where "*" is replaced with number of jobs:
+	 * <li>Pattern 1 (supports "<b>-j*</b>"): "text*text" -> "text#text"</li>
+	 * <li>Pattern 2 (supports "<b>-[j*]</b>"): "text[text*text]text" -> "texttext#texttext</li>
+	 * <br>Where # is num or empty if {@code empty} is {@code true})
+	 */
 	private String processParallelPattern(String pattern, boolean empty, int num){
 		int start = pattern.indexOf(PARALLEL_PATTERN_NUM_START);
 		int end = -1;
@@ -1190,6 +1252,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return args;
 	}
 
+	@Override
 	public String getErrorParserIds() {
 		String ids = errorParserIds;
 		if (ids == null) {
@@ -1201,6 +1264,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return ids;
 	}
 
+	@Override
 	public String[] getErrorParserList() {
 		String parserIDs = getErrorParserIds();
 		String[] errorParsers = null;
@@ -1223,6 +1287,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return errorParsers;
 	}
 
+	@Override
 	public void setCommand(String cmd) {
 		if(getCommand().equals(cmd)) return;
 		if (cmd == null && command == null) return;
@@ -1232,16 +1297,17 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		}
 	}
 
+	@Override
 	public void setArguments(String newArgs) {
 		if(getArguments().equals(newArgs))
 			return;
 		
 		if(newArgs != null){
 			String stopOnErrCmd = getStopOnErrCmd(isStopOnError());
-			String parallelBuildCmd = isParallelBuildOn() ? getParallelizationCmd(getParallelizationNum()) : EMPTY_STRING;
+			String parallelCmd = isParallelBuildOn() ? getParallelizationCmd(getParallelizationNum()) : EMPTY_STRING;
 
 			newArgs = removeCmd(newArgs, stopOnErrCmd);
-			newArgs = removeCmd(newArgs, parallelBuildCmd);
+			newArgs = removeCmd(newArgs, parallelCmd);
 		}
 		setArgumentsAttribute(newArgs);
 	}
@@ -1254,6 +1320,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		}
 	}
 
+	@Override
 	public void setErrorParserIds(String ids) {
 		String currentIds = getErrorParserIds();
 		if (ids == null && currentIds == null) return;
@@ -1263,11 +1330,13 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		}
 	}
 
+	@Override
 	public void setIsAbstract(boolean b) {
 		isAbstract = new Boolean(b);
 		setDirty(true);
 	}
 	
+	@Override
 	public IConfigurationElement getBuildFileGeneratorElement() {
 		if (buildFileGeneratorElement == null) {
 			if (superClass != null) {
@@ -1277,6 +1346,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return buildFileGeneratorElement;
 	}
 	
+	@Override
 	public IManagedBuilderMakefileGenerator getBuildFileGenerator(){
 		IConfigurationElement element = getBuildFileGeneratorElement();
 		if (element != null) {
@@ -1299,6 +1369,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 	}
 
 	
+	@Override
 	public void setBuildFileGeneratorElement(IConfigurationElement element) {
 		buildFileGeneratorElement = element;
 		setDirty(true);
@@ -1344,6 +1415,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		}
 	}
 
+	@Override
 	public String getConvertToId() {
 		if (convertToId == null) {
 			// If I have a superClass, ask it
@@ -1356,6 +1428,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return convertToId;
 	}
 
+	@Override
 	public void setConvertToId(String convertToId) {
 		if (convertToId == null && this.convertToId == null) return;
 		if (convertToId == null || this.convertToId == null || !convertToId.equals(this.convertToId)) {
@@ -1365,6 +1438,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return;
 	}
 
+	@Override
 	public String getVersionsSupported() {
 		if (versionsSupported == null) {
 			// If I have a superClass, ask it
@@ -1377,6 +1451,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return versionsSupported;
 	}
 
+	@Override
 	public void setVersionsSupported(String versionsSupported) {
 		if (versionsSupported == null && this.versionsSupported == null) return;
 		if (versionsSupported == null || this.versionsSupported == null || !versionsSupported.equals(this.versionsSupported)) {
@@ -1386,18 +1461,21 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return;
 	}
 	
+	@Override
 	public IFileContextBuildMacroValues getFileContextBuildMacroValues(){
 		if(fileContextBuildMacroValues == null && superClass != null)
 			return getSuperClass().getFileContextBuildMacroValues();
 		return fileContextBuildMacroValues;
 	}
 	
+	@Override
 	public String getBuilderVariablePattern(){
 		if(builderVariablePattern == null && superClass != null)
 			return getSuperClass().getBuilderVariablePattern();
 		return builderVariablePattern;
 	}
 	
+	@Override
 	public boolean isVariableCaseSensitive(){
 		if(isVariableCaseSensitive == null){
 			if(superClass != null)
@@ -1407,12 +1485,14 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return isVariableCaseSensitive.booleanValue();
 	}
 	
+	@Override
 	public String[] getReservedMacroNames(){
 		if(reservedMacroNames == null && superClass != null)
 			return getSuperClass().getReservedMacroNames();
 		return reservedMacroNames;
 	}
 	
+	@Override
 	public IReservedMacroNameSupplier getReservedMacroNameSupplier(){
 		if(reservedMacroNameSupplier == null && reservedMacroNameSupplierElement != null){
 			try{
@@ -1617,6 +1697,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return currentMbsVersionConversionElement;
 	}
 
+	@Override
 	public CBuildData getBuildData() {
 		return fBuildData;
 	}
@@ -1627,6 +1708,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 //		return null;
 //	}
 	
+	@Override
 	public String[] getErrorParsers() {
 		if(isCustomBuilder() && customizedErrorParserIds != null)
 			return customizedErrorParserIds.clone();
@@ -1646,6 +1728,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		customizedErrorParserIds = ids != null ? (String[])ids.clone() : ids;
 	}
 
+	@Override
 	public void setErrorParsers(String[] parsers) throws CoreException {
 		if(isCustomBuilder()){
 			customizedErrorParserIds = (parsers != null && parsers.length != 0) ? (String[])parsers.clone() : parsers;
@@ -1660,6 +1743,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return this;//!isExtensionBuilder ? (Object)this : (Object)getParent().getParent();
 	}
 
+	@Override
 	public String getBuildArguments() {
 		String args = getArguments();
 		IBuildMacroProvider provider = ManagedBuildManager.getBuildMacroProvider();
@@ -1672,6 +1756,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return args;
 	}
 
+	@Override
 	public IPath getBuildCommand() {
 		String command = getCommand();
 		IBuildMacroProvider provider = ManagedBuildManager.getBuildMacroProvider();
@@ -1697,6 +1782,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return buildPath;
 	}
 	
+	@Override
 	public void setBuildPath(String path){
 		setBuildPathAttribute(path);
 	}
@@ -1706,6 +1792,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		setDirty(true);
 	}
 	
+	@Override
 	public String getBuildPath(){
 		if(isManagedBuildOn())
 			return getDefaultBuildPath();
@@ -1791,6 +1878,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return isWorkspaceBuildPath.booleanValue();
 	}
 */
+	@Override
 	public IPath getBuildLocation() {
 		String path = getBuildPath();
 		
@@ -1804,10 +1892,12 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return new Path(path);
 	}
 
+	@Override
 	public boolean isDefaultBuildCmd() {
 		return isExtensionBuilder || (command == null && args == null /*&& stopOnErr == null && parallelBuildOn == null && parallelNum == null */ &&  superClass != null);
 	}
 
+	@Override
 	public boolean isStopOnError() {
 		if(stopOnErr == null){
 			if(superClass != null){
@@ -1818,20 +1908,24 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return stopOnErr.booleanValue();
 	}
 
+	@Override
 	public void setBuildArguments(String args) throws CoreException {
 		setArguments(args);
 	}
 
+	@Override
 	public void setBuildCommand(IPath command) throws CoreException {
 		String cmd = command != null ? command.toString() : null;
 		setCommand(cmd);
 	}
 
+	@Override
 	public void setBuildLocation(IPath location) throws CoreException {
 		String path = location != null ? location.toString() : null;
 		setBuildPath(path);
 	}
 
+	@Override
 	public void setStopOnError(boolean on) throws CoreException {
 		if(isStopOnError() == on)
 			return;
@@ -1847,6 +1941,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		setDirty(true);
 	}
 
+	@Override
 	public void setUseDefaultBuildCmd(boolean on) throws CoreException {
 		if(!isExtensionBuilder && superClass != null){
 			if(on){
@@ -1870,6 +1965,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return autoBuildTarget;
 	}
 	
+	@Override
 	public String getAutoBuildTarget() {
 		String attr = getAutoBuildTargetAttribute();
 		
@@ -1898,6 +1994,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return cleanBuildTarget;
 	}
 
+	@Override
 	public String getCleanBuildTarget() {
 		String attr = getCleanBuildTargetAttribute();
 		
@@ -1917,6 +2014,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 	}
 
 	
+	@Override
 	public String getFullBuildTarget() {
 		return getIncrementalBuildTarget();
 	}
@@ -1930,6 +2028,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return incrementalBuildTarget;
 	}
 
+	@Override
 	public String getIncrementalBuildTarget() {
 		String attr = getIncrementalBuildTargetAttribute();
 		
@@ -1948,6 +2047,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return attr;
 	}
 
+	@Override
 	public boolean isAutoBuildEnable() {
 		if(autoBuildEnabled == null){
 			if(superClass != null)
@@ -1957,6 +2057,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return autoBuildEnabled.booleanValue();
 	}
 
+	@Override
 	public boolean isCleanBuildEnabled() {
 		if(cleanBuildEnabled == null){
 			if(superClass != null)
@@ -1966,10 +2067,12 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return cleanBuildEnabled.booleanValue();
 	}
 
+	@Override
 	public boolean isFullBuildEnabled() {
 		return isIncrementalBuildEnabled();
 	}
 
+	@Override
 	public boolean isIncrementalBuildEnabled() {
 		if(incrementalBuildEnabled == null){
 			if(superClass != null)
@@ -1979,38 +2082,47 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return incrementalBuildEnabled.booleanValue();
 	}
 
+	@Override
 	public void setAutoBuildEnable(boolean enabled) throws CoreException {
 		autoBuildEnabled = Boolean.valueOf(enabled);
 	}
 
+	@Override
 	public void setAutoBuildTarget(String target) throws CoreException {
 		autoBuildTarget = target;
 	}
 
+	@Override
 	public void setCleanBuildEnable(boolean enabled) throws CoreException {
 		cleanBuildEnabled = Boolean.valueOf(enabled);
 	}
 
+	@Override
 	public void setCleanBuildTarget(String target) throws CoreException {
 		cleanBuildTarget = target;
 	}
 
+	@Override
 	public void setFullBuildEnable(boolean enabled) throws CoreException {
 		setIncrementalBuildEnable(enabled);
 	}
 
+	@Override
 	public void setFullBuildTarget(String target) throws CoreException {
 		setIncrementalBuildTarget(target);
 	}
 
+	@Override
 	public void setIncrementalBuildEnable(boolean enabled) throws CoreException {
 		incrementalBuildEnabled = Boolean.valueOf(enabled);
 	}
 
+	@Override
 	public void setIncrementalBuildTarget(String target) throws CoreException {
 		incrementalBuildTarget = target;
 	}
 
+	@Override
 	public boolean appendEnvironment() {
 		if(appendEnvironment == null){
 			if(superClass != null){
@@ -2021,6 +2133,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return appendEnvironment.booleanValue();
 	}
 
+	@Override
 	public String getBuildAttribute(String name, String defaultValue) {
 		String result = null;
 		if(BUILD_TARGET_INCREMENTAL.equals(name)){
@@ -2156,12 +2269,14 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 	}
 	
 
+	@Override
 	public Map<String, String> getEnvironment() {
 		if(customizedEnvironment != null)
 			return cloneMap(customizedEnvironment);
 		return null;
 	}
 
+	@Override
 	public Map<String, String> getExpandedEnvironment() throws CoreException {
 		if(customizedEnvironment != null){
 			Map<String, String> expanded = cloneMap(customizedEnvironment);
@@ -2183,10 +2298,12 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return null;
 	}
 
+	@Override
 	public void setAppendEnvironment(boolean append) throws CoreException {
 		appendEnvironment = Boolean.valueOf(append);
 	}
 
+	@Override
 	public void setBuildAttribute(String name, String value)
 			throws CoreException {
 		if(BUILD_TARGET_INCREMENTAL.equals(name)){
@@ -2255,10 +2372,12 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return customBuildProperties;
 	}
 
+	@Override
 	public void setEnvironment(Map<String, String> env) throws CoreException {
 		customizedEnvironment = new HashMap<String, String>(env);
 	}
 
+	@Override
 	public boolean isCustomBuilder() {
 		if(!isExtensionBuilder && getParent().getBuilder() != this)
 			return true;
@@ -2271,6 +2390,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return null;
 	}
 
+	@Override
 	public boolean isManagedBuildOn() {
 		IConfiguration cfg = getConfguration();
 		if(cfg != null){
@@ -2295,14 +2415,17 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return managedBuildOn;
 	}
 
+	@Override
 	public void setManagedBuildOn(boolean on) throws CoreException {
 		managedBuildOn = Boolean.valueOf(on);
 	}
 
+	@Override
 	public boolean canKeepEnvironmentVariablesInBuildfile() {
 		return BuildMacroProvider.canKeepMacrosInBuildfile(this);
 	}
 
+	@Override
 	public boolean keepEnvironmentVariablesInBuildfile() {
 		if(keepEnvVarInBuildfile == null){
 			if(superClass != null)
@@ -2312,10 +2435,12 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return keepEnvVarInBuildfile.booleanValue();
 	}
 
+	@Override
 	public void setKeepEnvironmentVariablesInBuildfile(boolean keep) {
 		keepEnvVarInBuildfile = Boolean.valueOf(keep);
 	}
 
+	@Override
 	public boolean supportsCustomizedBuild() {
 		if(fSupportsCustomizedBuild == null){
 			IManagedBuilderMakefileGenerator makeGen = getBuildFileGenerator();
@@ -2327,6 +2452,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return fSupportsCustomizedBuild.booleanValue();
 	}
 	
+	@Override
 	public boolean supportsBuild(boolean managed) {
 		if(supportsManagedBuild == null){
 			if(superClass != null)
@@ -2340,6 +2466,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		parent = toolChain;
 	}
 
+	@Override
 	public boolean matches(IBuilder builder){
 		if(builder == this)
 			return true;
@@ -2351,6 +2478,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return rBld == ManagedBuildManager.getRealBuilder(builder);
 	}
 
+	@Override
 	public MatchKey<Builder> getMatchKey() {
 		if(isAbstract())
 			return null;
@@ -2359,6 +2487,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return new MatchKey<Builder>(this);
 	}
 
+	@Override
 	public void setIdenticalList(List<Builder> list) {
 		identicalList = list;
 	}
@@ -2372,10 +2501,12 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return name;
 	}
 
+	@Override
 	public List<Builder> getIdenticalList() {
 		return identicalList;
 	}
 
+	@Override
 	public boolean isInternalBuilder() {
 		IBuilder internalBuilder = ManagedBuildManager.getInternalBuilder();
 		for(IBuilder builder = this; builder != null; builder = builder.getSuperClass()){
@@ -2385,42 +2516,86 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return false;
 	}
 
+	/**
+	 * Returns the optimal number of parallel jobs.
+	 * The number is the number of available processors on the machine.
+	 * 
+	 * The function never returns number smaller than 1.
+	 */
+	public int getOptimalParallelJobNum() {
+		return Runtime.getRuntime().availableProcessors();
+	}
+	
+	/**
+	 * {@inheritDoc}
+	 * 
+	 * Returns the number of parallel jobs to be used for a build.
+	 * Note that "optimal" value is represented by negative number.
+	 * See the table at {@link IMakeCommonBuildInfo#getParallelizationNum()}. 
+	 */
+	@Override
 	public int getParallelizationNum() {
-		if(supportsParallelBuild())
+		if (!isParallelBuildOn())
-			return getParallelizationNumAttribute();
 			return 1;
+
+		if(parallelJobsNumber == null){
+			if(superClass != null){
+				return ((Builder)superClass).getParallelizationNum();
+			}
+			return 1;
+		}
+		return parallelJobsNumber.intValue();
 	}
 
 	public int getParallelizationNumAttribute(){
-		if(parallelNum == null){
+		if(parallelJobsNumber == null){
 			if(superClass != null){
 				return ((Builder)superClass).getParallelizationNumAttribute();
 			}
 			return 1;
 		}
-		return parallelNum.intValue();
+		return parallelJobsNumber.intValue();
 	}
 
-	public void setParallelizationNum(int num) throws CoreException {
+	/**
-//		if(num == 0 || supportsParallelBuild()){
+	 * {@inheritDoc}
-			Integer newParallelNum = new Integer(num);
+	 * 
+	 * @param jobs - maximum number of jobs or threads. If the number is 0
+	 *    or negative, negative "optimal" number will be set, see
+	 *    {@link #getOptimalParallelJobNum()}.
+	 */
+	@Override
+	public void setParallelizationNum(int jobs) throws CoreException {
+		if (isParallelBuildOn() && (parallelJobsNumber == null || parallelJobsNumber != jobs)) {
 			String curCmd = getParallelizationCmd(getParallelizationNum());
 			String args = getArgumentsAttribute();
 			String updatedArgs = removeCmd(args, curCmd);
 			if (!updatedArgs.equals(args)) {
 				setArgumentsAttribute(updatedArgs);
 			}
-			parallelNum = newParallelNum;
+
+			if (jobs == Integer.MAX_VALUE && isInternalBuilder()) {
+				// Internal Builder does not support "unlimited" jobs, switching to "optimal"
+				jobs = -1;
+			}
+			if (jobs > 0) {
+				parallelJobsNumber = jobs;
+			} else {
+				// "optimal"
+				parallelJobsNumber = -getOptimalParallelJobNum();
+			}
 			setDirty(true);
-//		}
+		}
 	}
 
+	@Override
 	public boolean supportsParallelBuild() {
 		if(isInternalBuilder())
 			return true;
 		return getParrallelBuildCmd().length() != 0;
 	}
 
+	@Override
 	public boolean supportsStopOnError(boolean on) {
 		if(isInternalBuilder())
 			return true;
@@ -2456,16 +2631,26 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return parallelBuildCmd;
 	}
 
+	@Override
 	public boolean isParallelBuildOn() {
-		if(parallelBuildOn == null){
+		if (isParallelBuildEnabled == null) {
 			if (superClass != null) {
 				return getSuperClass().isParallelBuildOn();
 			}
 			return false;
 		}
-		return parallelBuildOn.booleanValue();
+		return isParallelBuildEnabled.booleanValue();
 	}
 
+	/**
+	 * {@inheritDoc}
+	 * 
+	 * @param on - the flag to enable or disable parallel mode.
+	 *    <br>{@code true} to enable, in this case the maximum number of jobs
+	 *      will be set to negative "optimal" number, see {@link #getOptimalParallelJobNum()}.
+	 *    <br>{@code false} to disable, the number of jobs will be set to 1.
+	 */
+	@Override
 	public void setParallelBuildOn(boolean on) throws CoreException {
 		if (isParallelBuildOn() == on)
 			return;
@@ -2478,7 +2663,15 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		if (!updatedArgs.equals(args)) {
 			setArgumentsAttribute(updatedArgs);
 		}
-		parallelBuildOn = Boolean.valueOf(on);
+
+		isParallelBuildEnabled = on;
+
+		if (isParallelBuildEnabled) {
+			// "optimal"
+			parallelJobsNumber = -getOptimalParallelJobNum();
+		} else {
+			parallelJobsNumber = 1;
+		}
 		setDirty(true);
 	}
 
@@ -2521,6 +2714,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		}
 	}
 	
+	@Override
 	public boolean isSystemObject() {
 		if(isTest)
 			return true;
@@ -2533,6 +2727,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return false;
 	}
 
+	@Override
 	public String getUniqueRealName() {
 		String name = getName();
 		if(name == null){
@@ -2604,6 +2799,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return num;
 	}
 
+	@Override
 	public int compareTo(Builder other) {
 		if(other.isSystemObject() != isSystemObject())
 			return isSystemObject() ? 1 : -1;
@@ -2611,30 +2807,37 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return getSuperClassNum() - other.getSuperClassNum();
 	}
 
+	@Override
 	public IRealBuildObjectAssociation getExtensionObject() {
 		return (Builder)ManagedBuildManager.getExtensionBuilder(this);
 	}
 
+	@Override
 	public IRealBuildObjectAssociation[] getIdenticBuildObjects() {
 		return (IRealBuildObjectAssociation[])ManagedBuildManager.findIdenticalBuilders(this);
 	}
 
+	@Override
 	public IRealBuildObjectAssociation getRealBuildObject() {
 		return (Builder)ManagedBuildManager.getRealBuilder(this);
 	}
 
+	@Override
 	public IRealBuildObjectAssociation getSuperClassObject() {
 		return (Builder)getSuperClass();
 	}
 
+	@Override
 	public final int getType() {
 		return OBJECT_BUILDER;
 	}
 
+	@Override
 	public boolean isRealBuildObject() {
 		return ManagedBuildManager.getRealBuilder(this) == this;
 	}
 
+	@Override
 	public boolean isExtensionBuildObject() {
 		return isExtensionElement();
 	}
@@ -2643,6 +2846,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return getUniqueRealName();
 	}
 
+	@Override
 	public ICommandLauncher getCommandLauncher() {
 		if(fCommandLauncher != null)
 			return fCommandLauncher;
@@ -2664,6 +2868,7 @@ public class Builder extends HoldsOptions implements IBuilder, IMatchKeyProvider
 		return fCommandLauncher;
 	}
 
+	@Override
 	public AbstractBuildRunner getBuildRunner() throws CoreException {
 		// Already defined
 		if (fBuildRunner != null)

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Configuration.java

@@ -81,6 +81,7 @@ import org.eclipse.cdt.managedbuilder.internal.macros.OptionContextData;
 import org.eclipse.cdt.managedbuilder.macros.BuildMacroException;
 import org.eclipse.cdt.managedbuilder.macros.IBuildMacroProvider;
 import org.eclipse.cdt.managedbuilder.macros.IConfigurationBuildMacroSupplier;
+import org.eclipse.cdt.newmake.core.IMakeCommonBuildInfo;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.IResourceDelta;
@@ -752,7 +753,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	 *  E L E M E N T   A T T R I B U T E   R E A D E R S   A N D   W R I T E R S
 	 */
 	
-	/* (non-Javadoc)
+	/**
 	 * Initialize the configuration information from an element in the 
 	 * manifest file or provided by a dynamicElementProvider
 	 * 
@@ -803,7 +804,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
         	isTest = Boolean.valueOf(tmp).booleanValue();
 	}
 	
-	/* (non-Javadoc)
+	/**
 	 * Initialize the configuration information from the XML element 
 	 * specified in the argument
 	 * 
@@ -970,6 +971,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getParent()
 	 */
+	@Override
 	public IConfiguration getParent() {
 		return parent;
 	}
@@ -977,6 +979,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getOwner()
 	 */
+	@Override
 	public IResource getOwner() {
 		if (managedProject != null)
 			return managedProject.getOwner();
@@ -988,6 +991,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getProjectType()
 	 */
+	@Override
 	public IProjectType getProjectType() {
 		return projectType;
 	}
@@ -995,6 +999,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getManagedProject()
 	 */
+	@Override
 	public IManagedProject getManagedProject() {
 		return managedProject;
 	}
@@ -1002,6 +1007,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getToolChain(IToolChain, String, String, boolean)
 	 */
+	@Override
 	public IToolChain createToolChain(IToolChain superClass, String Id, String name, boolean isExtensionElement) {
 		if(rootFolderInfo == null){
 			createRootFolderInfo();
@@ -1030,6 +1036,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getToolChain()
 	 */
+	@Override
 	public IToolChain getToolChain() {
 		return rootFolderInfo.getToolChain();
 	}
@@ -1037,6 +1044,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getResourceConfigurations()
 	 */
+	@Override
 	public IResourceConfiguration[] getResourceConfigurations() {
 		return (IResourceConfiguration[])rcInfos.getResourceInfos(ICSettingBase.SETTING_FILE, IResourceConfiguration.class);
 	}
@@ -1044,6 +1052,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getResourceConfiguration(java.lang.String)
 	 */
+	@Override
 	public IResourceConfiguration getResourceConfiguration(String resPath) {
 		return rcInfos.getFileInfo(new Path(resPath).removeFirstSegments(1));
 	}
@@ -1051,6 +1060,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getFilteredTools()
 	 */
+	@Override
 	public ITool[] getFilteredTools() {
 		return rootFolderInfo.getFilteredTools();
 	}
@@ -1058,6 +1068,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getTools()
 	 */
+	@Override
 	public ITool[] getTools() {
 		return rootFolderInfo.getTools();
 	}
@@ -1065,6 +1076,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getTool(java.lang.String)
 	 */
+	@Override
 	public ITool getTool(String id) {
 		return rootFolderInfo.getTool(id);
 	}
@@ -1072,6 +1084,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getToolsBySuperClassId(java.lang.String) 
 	 */
+	@Override
 	public ITool[] getToolsBySuperClassId(String id) {
 		return rootFolderInfo.getToolsBySuperClassId(id);
 	}
@@ -1079,6 +1092,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getTargetTool()
 	 */
+	@Override
 	public ITool getTargetTool() {
 		String[] targetToolIds = rootFolderInfo.getToolChain().getTargetToolList();
 		if (targetToolIds == null || targetToolIds.length == 0) return null;
@@ -1106,6 +1120,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setToolCommand(org.eclipse.cdt.managedbuilder.core.ITool, java.lang.String)
 	 */
+	@Override
 	public String getToolCommand(ITool tool) {
 		// TODO:  Do we need to verify that the tool is part of the configuration?
 		return tool.getToolCommand();
@@ -1114,6 +1129,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setToolCommand(org.eclipse.cdt.managedbuilder.core.ITool, java.lang.String)
 	 */
+	@Override
 	public void setToolCommand(ITool tool, String command) {
 		// TODO:  Do we need to verify that the tool is part of the configuration?
 		tool.setToolCommand(command);
@@ -1122,6 +1138,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#setOption(org.eclipse.cdt.core.build.managed.IOption, boolean)
 	 */
+	@Override
 	public IOption setOption(IHoldsOptions holder, IOption option, boolean value) throws BuildException {
 		return getRootFolderInfo().setOption(holder, option, value);
 	}
@@ -1129,6 +1146,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#setOption(org.eclipse.cdt.core.build.managed.IOption, java.lang.String)
 	 */
+	@Override
 	public IOption setOption(IHoldsOptions holder, IOption option, String value) throws BuildException {
 		return getRootFolderInfo().setOption(holder, option, value);
 	}
@@ -1136,6 +1154,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#setOption(org.eclipse.cdt.core.build.managed.IOption, java.lang.String[])
 	 */
+	@Override
 	public IOption setOption(IHoldsOptions holder, IOption option, String[] value) throws BuildException {
 		return getRootFolderInfo().setOption(holder, option, value);
 	}
@@ -1153,6 +1172,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 //		rebuildNeeded = true;
 	}
 
+	@Override
 	public void removeResourceConfiguration(IResourceInfo resConfig) {
 		ManagedBuildManager.performValueHandlerEvent(resConfig, 
  					IManagedOptionValueHandler.EVENT_CLOSE);
@@ -1178,6 +1198,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getArtifactExtension()
 	 */
+	@Override
 	public String getArtifactExtension() {
 		String ext = getArtifactExtensionAttribute(true);
 		return ext != null ? ext : EMPTY_STRING;
@@ -1197,6 +1218,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getArtifactName()
 	 */
+	@Override
 	public String getArtifactName() {
 		if (artifactName == null) {
 			// If I have a parent, ask it
@@ -1214,6 +1236,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getBuildArguments()
 	 */
+	@Override
 	public String getBuildArguments() {
 		IToolChain tc = getToolChain();
 		IBuilder builder = tc.getBuilder();
@@ -1226,6 +1249,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getBuildCommand()
 	 */
+	@Override
 	public String getBuildCommand() {
 		IToolChain tc = getToolChain();
 		IBuilder builder = tc.getBuilder();
@@ -1240,6 +1264,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	 * 
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getPrebuildStep()
 	 */
+	@Override
 	public String getPrebuildStep() {
 		if (prebuildStep == null) {
 			// If I have a parent, ask it
@@ -1259,6 +1284,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	 * 
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getPostbuildStep()
 	 */
+	@Override
 	public String getPostbuildStep() {
 		if (postbuildStep == null) {
 			// If I have a parent, ask it
@@ -1278,6 +1304,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	 * 
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getPreannouncebuildStep()
 	 */
+	@Override
 	public String getPreannouncebuildStep() {
 		if (preannouncebuildStep == null) {
 			// If I have a parent, ask it
@@ -1297,6 +1324,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	 * 
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getPostannouncebuildStep()
 	 */
+	@Override
 	public String getPostannouncebuildStep() {
 		if (postannouncebuildStep == null) {
 			// If I have a parent, ask it
@@ -1316,6 +1344,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	 * 
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getCleanCommand()
 	 */
+	@Override
 	public String getCleanCommand() {
 		// Return the command used to remove files
 		if (cleanCommand == null) {
@@ -1338,6 +1367,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#getDescription()
 	 */
+	@Override
 	public String getDescription() {
 		if (description == null) {
 			// If I have a parent, ask it
@@ -1357,6 +1387,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	 * 
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getErrorParserIds()
 	 */
+	@Override
 	public String getErrorParserIds() {
 		if (errorParserIds != null) {
 			return errorParserIds;
@@ -1392,6 +1423,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getErrorParserList()
 	 */
+	@Override
 	public String[] getErrorParserList() {
 		Set<String> set = contributeErrorParsers(null, true);
 		if(set != null){
@@ -1428,6 +1460,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setArtifactExtension(java.lang.String)
 	 */
+	@Override
 	public void setArtifactExtension(String extension) {
 		if (extension == null && artifactExtension == null) return;
 		if (artifactExtension == null || extension == null || !artifactExtension.equals(extension)) {
@@ -1449,6 +1482,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#setArtifactName(java.lang.String)
 	 */
+	@Override
 	public void setArtifactName(String name) {
 		if (name == null && artifactName == null) return;
 		if (artifactName == null || name == null || !artifactName.equals(name)) {
@@ -1490,6 +1524,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setErrorParserIds()
 	 */
+	@Override
 	public void setErrorParserIds(String ids) {
 		String currentIds = getErrorParserIds();
 		if (ids == null && currentIds == null) return;
@@ -1502,6 +1537,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setCleanCommand()
 	 */
+	@Override
 	public void setCleanCommand(String command) {
 		if (command == null && cleanCommand == null) return;
 		if (cleanCommand == null || command == null || !cleanCommand.equals(command)) {
@@ -1513,6 +1549,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.build.managed.IConfiguration#setDescription(java.lang.String)
 	 */
+	@Override
 	public void setDescription(String description) {
 		 if (description == null && this.description == null) return; 
 	        if (this.description == null || description == null || !description.equals(this.description)) { 
@@ -1524,6 +1561,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setBuildArguments()
 	 */
+	@Override
 	public void setBuildArguments(String makeArgs) {
 		IToolChain tc = getToolChain();
 		IBuilder builder = tc.getBuilder();
@@ -1546,6 +1584,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setBuildCommand()
 	 */
+	@Override
 	public void setBuildCommand(String command) {
 		IToolChain tc = getToolChain();
 		IBuilder builder = tc.getBuilder();
@@ -1568,6 +1607,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
     /* (non-Javadoc) 
      * @see org.eclipse.cdt.core.build.managed.IConfiguration#setPrebuildStep(java.lang.String) 
      */ 
+    @Override
 	public void setPrebuildStep(String step) { 
         if (step == null && prebuildStep == null) return; 
         if (prebuildStep == null || step == null || !prebuildStep.equals(step)) { 
@@ -1581,6 +1621,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
     /* (non-Javadoc) 
      * @see org.eclipse.cdt.core.build.managed.IConfiguration#setPostbuildStep(java.lang.String) 
      */ 
+    @Override
 	public void setPostbuildStep(String step) { 
         if (step == null && postbuildStep == null) return; 
         if (postbuildStep == null || step == null || !postbuildStep.equals(step)) { 
@@ -1593,6 +1634,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
     /* (non-Javadoc) 
      * @see org.eclipse.cdt.core.build.managed.IConfiguration#setPreannouncebuildStep(java.lang.String) 
      */ 
+    @Override
 	public void setPreannouncebuildStep(String announceStep) { 
         if (announceStep == null && preannouncebuildStep == null) return; 
         if (preannouncebuildStep == null || announceStep == null || !preannouncebuildStep.equals(announceStep)) {
@@ -1605,6 +1647,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
     /* (non-Javadoc) 
      * @see org.eclipse.cdt.core.build.managed.IConfiguration#setPostannouncebuildStep(java.lang.String) 
      */ 
+    @Override
 	public void setPostannouncebuildStep(String announceStep) { 
         if (announceStep == null && postannouncebuildStep == null) return; 
         if (postannouncebuildStep == null || announceStep == null || !postannouncebuildStep.equals(announceStep)) {
@@ -1617,6 +1660,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isSupported()
 	 */
+	@Override
 	public boolean isSupported(){
 		IFolderInfo foInfo = getRootFolderInfo();
 		if(foInfo != null)
@@ -1627,6 +1671,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isHeaderFile(java.lang.String)
 	 */
+	@Override
 	public boolean isHeaderFile(String ext) {
 		return getRootFolderInfo().isHeaderFile(ext);
 	}
@@ -1638,6 +1683,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isExtensionElement()
 	 */
+	@Override
 	public boolean isExtensionElement() {
 		return isExtensionConfig;
 	}
@@ -1645,6 +1691,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isDirty()
 	 */
+	@Override
 	public boolean isDirty() {
 		// This shouldn't be called for an extension configuration
  		if (isExtensionConfig) return false;
@@ -1665,10 +1712,12 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#needsRebuild()
 	 */
+	@Override
 	public boolean needsRebuild() {
 		return needsRebuild(true);
 	}
 	
+	@Override
 	public boolean needsFullRebuild() {
 		return needsRebuild(false);
 	}
@@ -1692,6 +1741,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setDirty(boolean)
 	 */
+	@Override
 	public void setDirty(boolean isDirty) {
 		// Override the dirty flag
 		this.isDirty = isDirty;
@@ -1708,6 +1758,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setRebuildState(boolean)
 	 */
+	@Override
 	public void setRebuildState(boolean rebuild) {
 		if(isExtensionElement() && rebuild)
 			return;
@@ -1731,6 +1782,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#hasOverriddenBuildCommand()
 	 */
+	@Override
 	public boolean hasOverriddenBuildCommand() {
 		IBuilder builder = getToolChain().getBuilder();
 		if (builder != null) {
@@ -1785,21 +1837,24 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		((FolderInfo)getRootFolderInfo()).resetOptionSettings();
 	}
 
-	/*
+	/**
 	 *  Create a resource configuration object for the passed-in file
 	 */
+	@Override
 	public IResourceConfiguration createResourceConfiguration(IFile file)
 	{
 		return createFileInfo(file.getFullPath().removeFirstSegments(1));
 		 
 	}
 
+	@Override
 	public IFileInfo createFileInfo(IPath path){
 		String resourceName = path.lastSegment();
 		String id = ManagedBuildManager.calculateChildId(getId(), path.toString());
 		return createFileInfo(path, id, resourceName);
 	}
 
+	@Override
 	public IFileInfo createFileInfo(IPath path, String id, String name){
 		IResourceInfo info = getResourceInfo(path, false);
 		IFileInfo fileInfo = null;
@@ -1812,6 +1867,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return fileInfo;
 	}
 	
+	@Override
 	public IFileInfo createFileInfo(IPath path, IFolderInfo base, ITool baseTool, String id, String name){
 		if(base.getPath().equals(path))
 			return null;
@@ -1823,6 +1879,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return fileInfo;
 	}
 
+	@Override
 	public IFileInfo createFileInfo(IPath path, IFileInfo base, String id, String name){
 		if(base.getPath().equals(path))
 			return null;
@@ -1837,6 +1894,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getEnvironmentVariableSupplier()
 	 */
+	@Override
 	public IConfigurationEnvironmentVariableSupplier getEnvironmentVariableSupplier(){
 		IToolChain toolChain = getToolChain();
 		if(toolChain != null)
@@ -1865,6 +1923,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getBuildMacroSupplier()
 	 */
+	@Override
 	public IConfigurationBuildMacroSupplier getBuildMacroSupplier(){
 		IToolChain toolChain = getToolChain();
 		if(toolChain != null)
@@ -1876,6 +1935,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isTemporary()
 	 */
+	@Override
 	public boolean isTemporary(){
 		return isTemporary;
 	}
@@ -1902,6 +1962,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		}		
 	}
 	
+	@Override
 	public ITool calculateTargetTool(){
 		ITool tool = getTargetTool();
 		
@@ -1924,15 +1985,17 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return tool;
 	}
 	
+	@Override
 	public ITool getToolFromOutputExtension(String extension) {
 		return getRootFolderInfo().getToolFromOutputExtension(extension);
 	}
 	
+	@Override
 	public ITool getToolFromInputExtension(String sourceExtension) {
 		return getRootFolderInfo().getToolFromInputExtension(sourceExtension);
 	}
 
-	/*
+	/**
 	 * The resource delta passed to the builder is not always up-to-date
 	 * for the given configuration because between two builds of the same configuration
 	 * any number of other configuration builds may occur
@@ -2004,7 +2067,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 				prefs.getBoolean(pref, false) : defaultValue;
 	}
 */	
-	/*
+	/**
 	 * this method is used for enabling/disabling the internal builder
 	 * for the given configuration
 	 * 
@@ -2121,7 +2184,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return null;
 	}
 
-	/*
+	/**
 	 * returns whether the internal builder is enabled
 	 * @return boolean
 	 */
@@ -2129,7 +2192,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return getBuilder().isInternalBuilder(); 
 	}
 	
-	/*
+	/**
 	 * 
 	 * sets the Internal Builder mode
 	 * 
@@ -2144,7 +2207,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		}
 	}
 
-	/*
+	/**
 	 * returns the Internal Builder mode
 	 * if true, internal builder will ignore build errors while building,
 	 * otherwise it will stop at the first build error
@@ -2156,73 +2219,80 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 	}
 	
 	/**
-	 * 
 	 * sets the Internal Builder Parallel mode
-	 * 
 	 * @param parallel if true, internal builder will use parallel mode 
+	 * 
+	 * @deprecated since CDT 9.0. Use {@link #setParallelDef(boolean)}
 	 */
+	@Deprecated
 	public void setInternalBuilderParallel(boolean parallel){
-		if(getInternalBuilderParallel() == parallel)
+		setParallelDef(parallel);
-			return;
-		
-		try {
-			getEditableBuilder().setParallelBuildOn(parallel);
-		} catch (CoreException e) {
-		}
 	}
 	
 	/**
 	 * returns the Internal Builder parallel mode
 	 * if true, internal builder will work in parallel mode 
 	 * otherwise it will use only one thread
-	 * 
 	 * @return boolean
+	 * 
+	 * @deprecated since CDT 9.0. Use {@link #getParallelDef()}
 	 */
+	@Deprecated
 	public boolean getInternalBuilderParallel(){
-		return getBuilder().isParallelBuildOn();
+		return getParallelDef();
 	}
 	
 	/**
-	 * @param parallel if true, internal builder will use parallel mode 
+	 * Set parallel execution mode for the configuration's builder.
+	 * @see Builder#setParallelBuildOn(boolean)
+	 * 
+	 * @param parallel - the flag to enable or disable parallel mode.
 	 */
 	public void setParallelDef(boolean parallel){
 		if(getParallelDef() == parallel)
 			return;
 		
-		int num = getParallelNumber();
+		try {
-		if(num != 0){
+			getEditableBuilder().setParallelBuildOn(parallel);
-			setParallelNumber(-num);
+		} catch (CoreException e) {
-		} else {
+			ManagedBuilderCorePlugin.log(e);
-			if(parallel){
-				setParallelNumber(-1);
-			} else {
-				setParallelNumber(1);
-			}
 		}
 	}
 	
 	/**
-	 * @return boolean
+	 * Check if the configuration's builder is operating in parallel mode.
+	 * @return {@code true} if parallel mode is enabled, {@code false} otherwise.
 	 */
 	public boolean getParallelDef(){
-		int num = getBuilder().getParallelizationNum();
+		return getBuilder().isParallelBuildOn();
-		return num <= 0;
 	}
 	
 	/**
-	 * sets number of Parallel threads
+	 * Sets maximum number of parallel threads/jobs to be used by builder.
-	 */
+	 * Note that the number will be set only if the builder is in "parallel"
-	public void setParallelNumber(int n){
+	 * mode.
-		try {
-			getEditableBuilder().setParallelizationNum(n);
-		} catch (CoreException e) {
-		}
-	}
-	
-	/**
-	 * returns number of Parallel threads
 	 * 
-	 * @return int
+	 * @param jobs - maximum number of jobs or threads. If the number is 0
+	 *    or negative, negative "optimal" number will be set, see
+	 *    {@link Builder#getOptimalParallelJobNum()}.
+	 */
+	public void setParallelNumber(int jobs){
+		try {
+			getEditableBuilder().setParallelizationNum(jobs);
+		} catch (CoreException e) {
+			ManagedBuilderCorePlugin.log(e);
+		}
+	}
+	
+	/**
+	 * Returns maximum number of parallel threads/jobs used by the configuration's builder.
+	 * Note that this function can return negative value to indicate  "optimal" number.
+	 * 
+	 * @see #setParallelDef(boolean)
+	 * @see Builder#getParallelizationNum()
+	 * 
+	 * @return - maximum number of parallel threads or jobs used by the builder or negative number.
+	 *    For exact interpretation see table in {@link IMakeCommonBuildInfo#getParallelizationNum()}
 	 */
 	public int getParallelNumber(){
 		return getBuilder().getParallelizationNum();
@@ -2246,14 +2316,17 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 //		return prefs;
 //	}
 
+	@Override
 	public IResourceInfo[] getResourceInfos() {
 		return rcInfos.getResourceInfos();
 	}
 
+	@Override
 	public IResourceInfo getResourceInfo(IPath path, boolean exactPath) {
 		return rcInfos.getResourceInfo(path, exactPath);
 	}
 
+	@Override
 	public IResourceInfo getResourceInfoById(String id) {
 		IResourceInfo infos[] = rcInfos.getResourceInfos();
 		for(int i = 0; i < infos.length; i++){
@@ -2263,6 +2336,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return null;
 	}
 
+	@Override
 	public IFolderInfo getRootFolderInfo() {
 		return rootFolderInfo;
 	}
@@ -2272,22 +2346,26 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return new ResourceInfoContainer(cr, false);
 	}
 	
+	@Override
 	public CConfigurationData getConfigurationData(){
 		return fCfgData;
 	}
 
+	@Override
 	public void removeResourceInfo(IPath path) {
 		IResourceInfo info = getResourceInfo(path, true);
 		if(info != null)
 			removeResourceConfiguration(info);
 	}
 
+	@Override
 	public IFolderInfo createFolderInfo(IPath path) {
 		String resourceName = path.lastSegment();
 		String id = ManagedBuildManager.calculateChildId(getId(), path.toString());
 		return createFolderInfo(path, id, resourceName);
 	}
 
+	@Override
 	public IFolderInfo createFolderInfo(IPath path, String id, String name) {
 		IResourceInfo info = getResourceInfo(path, false);
 		IFolderInfo folderInfo = null;
@@ -2300,6 +2378,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return folderInfo;
 	}
 
+	@Override
 	public IFolderInfo createFolderInfo(IPath path, IFolderInfo base, String id, String name) {
 		if(base.getPath().equals(path))
 			return null;
@@ -2312,6 +2391,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return folderInfo;
 	}
 
+	@Override
 	public ICSourceEntry[] getSourceEntries() {
 		if(sourceEntries == null || sourceEntries.length == 0){
 			if(parent != null && sourceEntries == null)
@@ -2322,6 +2402,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return sourceEntries.clone();
 	}
 
+	@Override
 	public void setSourceEntries(ICSourceEntry[] entries) {
 		setSourceEntries(entries, true);
 	}
@@ -2355,6 +2436,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		}
 	}
 
+	@Override
 	public void setErrorParserList(String[] ids) {
 		if(ids == null){
 			//reset
@@ -2394,10 +2476,12 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		}
 	}
 
+	@Override
 	public CBuildData getBuildData() {
 		return getEditableBuilder().getBuildData();
 	}
 	
+	@Override
 	public IBuilder getEditableBuilder(){
 		IToolChain tc = getToolChain();
 		IBuilder builder = tc.getBuilder();
@@ -2409,10 +2493,12 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return builder;
 	}
 	
+	@Override
 	public IBuilder getBuilder(){
 		return getToolChain().getBuilder();
 	}
 	
+	@Override
 	public String getOutputPrefix(String outputExtension) {
 		// Treat null extensions as empty string
 		String ext = outputExtension == null ? new String() : outputExtension;
@@ -2437,6 +2523,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		fCfgDes = cfgDes;
 	}
 
+	@Override
 	public IBuildObjectProperties getBuildProperties() {
 		if(buildProperties == null){
 			BuildObjectProperties parentProps = findBuildProperties();
@@ -2467,6 +2554,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return supportsValue(type.getId(), value.getId());
 	}
 
+	@Override
 	public void propertiesChanged() {
 		if(isExtensionConfig)
 			return;
@@ -2490,6 +2578,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return booleanExpressionCalculator;
 	}
 
+	@Override
 	public boolean isSystemObject() {
 		if(isTest)
 			return true;
@@ -2500,10 +2589,12 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return false;
 	}
 
+	@Override
 	public String getOutputExtension(String resourceExtension) {
 		return getRootFolderInfo().getOutputExtension(resourceExtension);
 	}
 
+	@Override
 	public String getOutputFlag(String outputExt) {
 		// Treat null extension as an empty string
 		String ext = outputExt == null ? new String() : outputExt;
@@ -2521,6 +2612,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return flags;
 	}
 	
+	@Override
 	public IManagedCommandLineInfo generateToolCommandLineInfo( String sourceExtension, String[] flags, 
 			String outputFlag, String outputPrefix, String outputName, String[] inputResources, IPath inputLocation, IPath outputLocation ){
 		ITool[] tools = getFilteredTools();
@@ -2573,6 +2665,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return null;
 	}
 	
+	@Override
 	public String[] getUserObjects(String extension) {
 		Vector<String> objs = new Vector<String>();
 		ITool tool = calculateTargetTool();
@@ -2614,6 +2707,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return objs.toArray(new String[objs.size()]);
 	}
 	
+	@Override
 	public String[] getLibs(String extension) {
 		Vector<String> libs = new Vector<String>();
 		ITool tool = calculateTargetTool();
@@ -2668,6 +2762,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return libs.toArray(new String[libs.size()]);
 	}
 
+	@Override
 	public boolean buildsFileType(String srcExt) {
 		return getRootFolderInfo().buildsFileType(srcExt);
 	}
@@ -2735,6 +2830,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		}
 	}
 
+	@Override
 	public boolean supportsBuild(boolean managed) {
 		return supportsBuild(managed, true);
 	}
@@ -2755,6 +2851,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return true;
 	}
 
+	@Override
 	public boolean supportsType(String typeId) {
 		SupportedProperties props = findSupportedProperties();
 		boolean supports = false;
@@ -2768,6 +2865,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return supports;
 	}
 
+	@Override
 	public boolean supportsValue(String typeId, String valueId) {
 		SupportedProperties props = findSupportedProperties();
 		boolean supports = false;
@@ -2794,6 +2892,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		supportedProperties = new SupportedProperties(el);
 	}
 
+	@Override
 	public String[] getRequiredTypeIds() {
 		SupportedProperties props = findSupportedProperties();
 		List<String> list = new ArrayList<String>();
@@ -2806,6 +2905,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return list.toArray(new String[list.size()]);
 	}
 
+	@Override
 	public String[] getSupportedTypeIds() {
 		SupportedProperties props = findSupportedProperties();
 		List<String> list = new ArrayList<String>();
@@ -2818,6 +2918,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return list.toArray(new String[list.size()]);
 	}
 
+	@Override
 	public String[] getSupportedValueIds(String typeId) {
 		SupportedProperties props = findSupportedProperties();
 		List<String> list = new ArrayList<String>();
@@ -2830,6 +2931,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return list.toArray(new String[list.size()]);
 	}
 
+	@Override
 	public boolean requiresType(String typeId) {
 		SupportedProperties props = findSupportedProperties();
 		boolean requires = false;
@@ -2843,10 +2945,12 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return requires;
 	}
 
+	@Override
 	public boolean isManagedBuildOn() {
 		return getBuilder().isManagedBuildOn();
 	}
 
+	@Override
 	public void setManagedBuildOn(boolean on) throws BuildException {
 		try {
 			getEditableBuilder().setManagedBuildOn(on);
@@ -2855,6 +2959,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		}
 	}
 
+	@Override
 	public void changeBuilder(IBuilder newBuilder, String id, String name){
 		changeBuilder(newBuilder, id, name, false);
 	}
@@ -2884,6 +2989,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		}
 	}
 	
+	@Override
 	public boolean isBuilderCompatible(IBuilder builder){
 		return builder.supportsBuild(isManagedBuildOn());
 	}
@@ -2964,6 +3070,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return isPreferenceConfig;
 	}
 	
+	@Override
 	public IBuildPropertyValue getBuildArtefactType() {
 		IBuildObjectProperties props = findBuildProperties();
 		if(props != null){
@@ -2974,6 +3081,7 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		return null;
 	}
 	
+	@Override
 	public void setBuildArtefactType(String id) throws BuildException {
 		IBuildObjectProperties props = getBuildProperties();
 		try {
@@ -3026,34 +3134,42 @@ public class Configuration extends BuildObject implements IConfiguration, IBuild
 		}
 	}
 
+	@Override
 	public IRealBuildObjectAssociation getExtensionObject() {
 		return isExtensionConfig ? this : (Configuration)getParent();
 	}
 
+	@Override
 	public IRealBuildObjectAssociation[] getIdenticBuildObjects() {
 		return new Configuration[]{(Configuration)getExtensionObject()};
 	}
 
+	@Override
 	public IRealBuildObjectAssociation getRealBuildObject() {
 		return getExtensionObject();
 	}
 
+	@Override
 	public IRealBuildObjectAssociation getSuperClassObject() {
 		return (IRealBuildObjectAssociation)getParent();
 	}
 
+	@Override
 	public int getType() {
 		return OBJECT_CONFIGURATION;
 	}
 
+	@Override
 	public boolean isRealBuildObject() {
 		return getRealBuildObject() == this;
 	}
 
+	@Override
 	public String getUniqueRealName() {
 		return getName();
 	}
 
+	@Override
 	public boolean isExtensionBuildObject() {
 		return isExtensionElement();
 	}

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/GeneratedMakefileBuilder.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- *  Copyright (c) 2002, 2010 IBM Corporation and others.
+ *  Copyright (c) 2002, 2011 IBM Corporation and others.
  *  All rights reserved. This program and the accompanying materials
  *  are made available under the terms of the Eclipse Public License v1.0
  *  which accompanies this distribution, and is available at
@@ -151,6 +151,7 @@ public class GeneratedMakefileBuilder extends ACBuilder {
 			return fullBuildNeeded;
 		}
 
+		@Override
 		public boolean visit(IResourceDelta delta) throws CoreException {
 			IResource resource = delta.getResource();
 			// If the project has changed, then a build is needed and we can stop
@@ -231,6 +232,7 @@ public class GeneratedMakefileBuilder extends ACBuilder {
 			}
 		}
 		
+		@Override
 		public boolean visit(IResourceDelta delta) throws CoreException {
 			
 			IResource rc = delta.getResource();
@@ -906,7 +908,6 @@ public class GeneratedMakefileBuilder extends ACBuilder {
 			}
 
 			IPath makeCommand = new Path(makeCmd); 
-			if (makeCommand != null) {
 			String[] msgs = new String[2];
 			msgs[0] = makeCommand.toString();
 			msgs[1] = currentProject.getName();
@@ -1144,7 +1145,6 @@ public class GeneratedMakefileBuilder extends ACBuilder {
 				addBuilderMarkers(epm);
 				consoleOutStream.close();
 			}
-			}
 		} catch (Exception e) {
 			forgetLastBuiltState();
 		} finally {
@@ -1196,7 +1196,7 @@ public class GeneratedMakefileBuilder extends ACBuilder {
 			boolean resumeOnErr,
 			IProgressMonitor monitor) {
 		
-		boolean isParallel = ((Configuration)cfg).getInternalBuilderParallel();
+		boolean isParallel = ((Configuration)cfg).getParallelDef();
 		
 		// Get the project and make sure there's a monitor to cancel the build
 		IProject currentProject = cfg.getOwner().getProject();

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/MultiConfiguration.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2007, 2010 Intel Corporation and others.
+ * Copyright (c) 2007, 2011 Intel Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -44,6 +44,7 @@ import org.eclipse.cdt.managedbuilder.envvar.IConfigurationEnvironmentVariableSu
 import org.eclipse.cdt.managedbuilder.macros.IConfigurationBuildMacroSupplier;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IResource;
+import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.osgi.framework.Version;
@@ -91,6 +92,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#buildsFileType(java.lang.String)
 	 */
+	@Override
 	public boolean buildsFileType(String srcExt) {
 		return curr().buildsFileType(srcExt);
 	}
@@ -98,6 +100,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#calculateTargetTool()
 	 */
+	@Override
 	public ITool calculateTargetTool() {
 		return curr().calculateTargetTool();
 	}
@@ -105,6 +108,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#changeBuilder(org.eclipse.cdt.managedbuilder.core.IBuilder, java.lang.String, java.lang.String)
 	 */
+	@Override
 	public void changeBuilder(IBuilder newBuilder, String id, String name) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].changeBuilder(newBuilder, id, name);
@@ -113,6 +117,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createFileInfo(org.eclipse.core.runtime.IPath)
 	 */
+	@Override
 	public IFileInfo createFileInfo(IPath path) {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.createFileInfo(1)"); //$NON-NLS-1$
@@ -122,6 +127,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createFileInfo(org.eclipse.core.runtime.IPath, java.lang.String, java.lang.String)
 	 */
+	@Override
 	public IFileInfo createFileInfo(IPath path, String id, String name) {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.createFileInfo(3)"); //$NON-NLS-1$
@@ -131,6 +137,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createFileInfo(org.eclipse.core.runtime.IPath, org.eclipse.cdt.managedbuilder.core.IFolderInfo, org.eclipse.cdt.managedbuilder.core.ITool, java.lang.String, java.lang.String)
 	 */
+	@Override
 	public IFileInfo createFileInfo(IPath path, IFolderInfo base,
 			ITool baseTool, String id, String name) {
 		if (DEBUG)
@@ -141,6 +148,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createFileInfo(org.eclipse.core.runtime.IPath, org.eclipse.cdt.managedbuilder.core.IFileInfo, java.lang.String, java.lang.String)
 	 */
+	@Override
 	public IFileInfo createFileInfo(IPath path, IFileInfo base, String id, String name) {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.createFileInfo(4)"); //$NON-NLS-1$
@@ -150,6 +158,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createFolderInfo(org.eclipse.core.runtime.IPath)
 	 */
+	@Override
 	public IFolderInfo createFolderInfo(IPath path) {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.createFolderInfo()"); //$NON-NLS-1$
@@ -159,6 +168,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createFolderInfo(org.eclipse.core.runtime.IPath, java.lang.String, java.lang.String)
 	 */
+	@Override
 	public IFolderInfo createFolderInfo(IPath path, String id, String name) {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.createFolderInfo(3)"); //$NON-NLS-1$
@@ -168,6 +178,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createFolderInfo(org.eclipse.core.runtime.IPath, org.eclipse.cdt.managedbuilder.core.IFolderInfo, java.lang.String, java.lang.String)
 	 */
+	@Override
 	public IFolderInfo createFolderInfo(IPath path, IFolderInfo base, String id, String name) {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.createFolderInfo(4)"); //$NON-NLS-1$
@@ -177,6 +188,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createResourceConfiguration(org.eclipse.core.resources.IFile)
 	 */
+	@Override
 	public IResourceConfiguration createResourceConfiguration(IFile file) {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.createResourceConfiguration()"); //$NON-NLS-1$
@@ -186,6 +198,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#createToolChain(org.eclipse.cdt.managedbuilder.core.IToolChain, java.lang.String, java.lang.String, boolean)
 	 */
+	@Override
 	public IToolChain createToolChain(IToolChain superClass, String Id,
 			String name, boolean isExtensionElement) {
 		if (DEBUG)
@@ -196,6 +209,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#generateToolCommandLineInfo(java.lang.String, java.lang.String[], java.lang.String, java.lang.String, java.lang.String, java.lang.String[], org.eclipse.core.runtime.IPath, org.eclipse.core.runtime.IPath)
 	 */
+	@Override
 	public IManagedCommandLineInfo generateToolCommandLineInfo(
 			String sourceExtension, 
 			String[] flags, 
@@ -221,6 +235,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getArtifactExtension()
 	 */
+	@Override
 	public String getArtifactExtension() {
 		String s = fCfgs[0].getArtifactExtension();
 		for (int i=1; i<fCfgs.length; i++)
@@ -239,6 +254,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getArtifactName()
 	 */
+	@Override
 	public String getArtifactName() {
 		String s = fCfgs[0].getArtifactName();
 		for (int i=1; i<fCfgs.length; i++)
@@ -253,20 +269,30 @@ public class MultiConfiguration extends MultiItemsHolder implements
 		return s;
 	}
 
-	/* (non-Javadoc)
+	/**
-	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getBuildArguments()
+	 * @return build arguments if the arguments for all configurations match
+	 *    or {@code null} otherwise.
 	 */
+	@Override
 	public String getBuildArguments() {
-		String s = fCfgs[0].getBuildArguments();
+		String args0 = fCfgs[0].getBuildArguments();
-		for (int i=1; i<fCfgs.length; i++)
+		if (args0 == null)
-			if (! s.equals(fCfgs[i].getBuildArguments()))
+			args0 = EMPTY_STR;
-				return EMPTY_STR;
+		
-		return s;
+		for (IConfiguration cfg : fCfgs) {
+			String args = cfg.getBuildArguments();
+			if (args == null)
+				args = EMPTY_STR;
+			if (!args0.equals(args))
+				return null;
+		}
+		return args0;
 	}
 
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getBuildArtefactType()
 	 */
+	@Override
 	public IBuildPropertyValue getBuildArtefactType() {
 		IBuildPropertyValue b = fCfgs[0].getBuildArtefactType(); 
 		if (b == null)
@@ -280,6 +306,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getBuildCommand()
 	 */
+	@Override
 	public String getBuildCommand() {
 		String s = fCfgs[0].getBuildCommand();
 		if (s == null || s.length() == 0)
@@ -293,6 +320,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getBuildData()
 	 */
+	@Override
 	public CBuildData getBuildData() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getBuildData()"); //$NON-NLS-1$
@@ -302,6 +330,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getBuildMacroSupplier()
 	 */
+	@Override
 	public IConfigurationBuildMacroSupplier getBuildMacroSupplier() {
 		IConfigurationBuildMacroSupplier ms = fCfgs[0].getBuildMacroSupplier();
 		if (ms == null)
@@ -315,6 +344,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getBuilder()
 	 */
+	@Override
 	public IBuilder getBuilder() {
 		IBuilder b = fCfgs[0].getBuilder();
 		if (b == null)
@@ -328,6 +358,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getCleanCommand()
 	 */
+	@Override
 	public String getCleanCommand() {
 		String s = fCfgs[0].getCleanCommand();
 		for (int i=1; i<fCfgs.length; i++)
@@ -339,6 +370,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getConfigurationData()
 	 */
+	@Override
 	public CConfigurationData getConfigurationData() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getConfigurationData()"); //$NON-NLS-1$
@@ -348,6 +380,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getDescription()
 	 */
+	@Override
 	public String getDescription() {
 		String s = fCfgs[0].getDescription();
 		for (int i=1; i<fCfgs.length; i++)
@@ -359,6 +392,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getEditableBuilder()
 	 */
+	@Override
 	public IBuilder getEditableBuilder() {
 		return curr().getEditableBuilder();
 	}
@@ -366,6 +400,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getEnvironmentVariableSupplier()
 	 */
+	@Override
 	public IConfigurationEnvironmentVariableSupplier getEnvironmentVariableSupplier() {
 		IConfigurationEnvironmentVariableSupplier vs = fCfgs[0].getEnvironmentVariableSupplier();
 		if (vs == null)
@@ -380,6 +415,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getErrorParserIds()
 	 */
 	
+	@Override
 	public String getErrorParserIds() {
 		String s = fCfgs[0].getErrorParserIds();
 		if (s == null || s.length() == 0)
@@ -393,6 +429,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getErrorParserList()
 	 */
+	@Override
 	public String[] getErrorParserList() {
 		String[] s = fCfgs[0].getErrorParserList();
 		if (s == null || s.length == 0)
@@ -406,6 +443,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getFilteredTools()
 	 */
+	@Override
 	public ITool[] getFilteredTools() {
 		ITool[] ts = curr().getFilteredTools();
 		return ts;
@@ -414,6 +452,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getLibs(java.lang.String)
 	 */
+	@Override
 	public String[] getLibs(String extension) {
 		String[] s = fCfgs[0].getLibs(extension);
 		if (s == null || s.length == 0)
@@ -427,6 +466,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getManagedProject()
 	 */
+	@Override
 	public IManagedProject getManagedProject() {
 		IManagedProject s = fCfgs[0].getManagedProject();
 		if (s == null)
@@ -440,6 +480,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getOutputExtension(java.lang.String)
 	 */
+	@Override
 	public String getOutputExtension(String resourceExtension) {
 		String s = fCfgs[0].getOutputExtension(resourceExtension);
 		if (s == null || s.length() == 0)
@@ -453,6 +494,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getOutputFlag(java.lang.String)
 	 */
+	@Override
 	public String getOutputFlag(String outputExt) {
 		String s = fCfgs[0].getOutputFlag(outputExt);
 		if (s == null || s.length() == 0)
@@ -466,6 +508,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getOutputPrefix(java.lang.String)
 	 */
+	@Override
 	public String getOutputPrefix(String outputExtension) {
 		String s = fCfgs[0].getOutputPrefix(outputExtension);
 		if (s == null || s.length() == 0)
@@ -479,6 +522,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getOwner()
 	 */
+	@Override
 	public IResource getOwner() {
 		IResource s = fCfgs[0].getOwner();
 		if (s == null)
@@ -492,6 +536,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getParent()
 	 */
+	@Override
 	public IConfiguration getParent() {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.getParent()"); //$NON-NLS-1$
@@ -501,6 +546,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getPostannouncebuildStep()
 	 */
+	@Override
 	public String getPostannouncebuildStep() {
 		String s = fCfgs[0].getPostannouncebuildStep();
 		if (s == null || s.length() == 0)
@@ -514,6 +560,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getPostbuildStep()
 	 */
+	@Override
 	public String getPostbuildStep() {
 		String s = fCfgs[0].getPostbuildStep();
 		if (s == null || s.length() == 0)
@@ -527,6 +574,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getPreannouncebuildStep()
 	 */
+	@Override
 	public String getPreannouncebuildStep() {
 		String s = fCfgs[0].getPreannouncebuildStep();
 		if (s == null || s.length() == 0)
@@ -540,6 +588,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getPrebuildStep()
 	 */
+	@Override
 	public String getPrebuildStep() {
 		String s = fCfgs[0].getPrebuildStep();
 		if (s == null || s.length() == 0)
@@ -553,6 +602,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getProjectType()
 	 */
+	@Override
 	public IProjectType getProjectType() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getProjectType()"); //$NON-NLS-1$
@@ -562,6 +612,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getResourceConfiguration(java.lang.String)
 	 */
+	@Override
 	public IResourceConfiguration getResourceConfiguration(String path) {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.getResourceConfiguration()"); //$NON-NLS-1$
@@ -571,6 +622,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getResourceConfigurations()
 	 */
+	@Override
 	public IResourceConfiguration[] getResourceConfigurations() {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.getResourceConfigurations()"); //$NON-NLS-1$
@@ -580,6 +632,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getResourceInfo(org.eclipse.core.runtime.IPath, boolean)
 	 */
+	@Override
 	public IResourceInfo getResourceInfo(IPath path, boolean exactPath) {
 		IResourceInfo ris[] = new IResourceInfo[fCfgs.length];
 		boolean isFolder = true;
@@ -599,6 +652,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getResourceInfoById(java.lang.String)
 	 */
+	@Override
 	public IResourceInfo getResourceInfoById(String id) {
 		if (DEBUG)
 			System.out.println("Bad multi access: MultiConfiguration.getResourceInfoById()"); //$NON-NLS-1$
@@ -608,6 +662,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getResourceInfos()
 	 */
+	@Override
 	public IResourceInfo[] getResourceInfos() {
 		ArrayList<IResourceInfo> ri = new ArrayList<IResourceInfo>();
 		for (int i=0; i<fCfgs.length; i++) {
@@ -620,6 +675,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getRootFolderInfo()
 	 */
+	@Override
 	public IFolderInfo getRootFolderInfo() {
 		IFolderInfo ris[] = new IFolderInfo[fCfgs.length];
 		for (int i=0; i<fCfgs.length; i++)
@@ -630,6 +686,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getSourceEntries()
 	 */
+	@Override
 	public ICSourceEntry[] getSourceEntries() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getSourceEntries()"); //$NON-NLS-1$
@@ -639,6 +696,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getTargetTool()
 	 */
+	@Override
 	public ITool getTargetTool() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getTargetTool()"); //$NON-NLS-1$
@@ -648,6 +706,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getTool(java.lang.String)
 	 */
+	@Override
 	public ITool getTool(String id) {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getTool()"); //$NON-NLS-1$
@@ -657,6 +716,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getToolChain()
 	 */
+	@Override
 	public IToolChain getToolChain() {
 		return curr().getToolChain();
 	}
@@ -664,6 +724,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getToolCommand(org.eclipse.cdt.managedbuilder.core.ITool)
 	 */
+	@Override
 	public String getToolCommand(ITool tool) {
 		return curr().getToolCommand(tool);
 	}
@@ -671,6 +732,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getToolFromInputExtension(java.lang.String)
 	 */
+	@Override
 	public ITool getToolFromInputExtension(String sourceExtension) {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getToolFromInputExtension()"); //$NON-NLS-1$
@@ -680,6 +742,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getToolFromOutputExtension(java.lang.String)
 	 */
+	@Override
 	public ITool getToolFromOutputExtension(String extension) {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getToolFromOutputExtension()"); //$NON-NLS-1$
@@ -689,6 +752,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getTools()
 	 */
+	@Override
 	public ITool[] getTools() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getTools()"); //$NON-NLS-1$
@@ -698,6 +762,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getToolsBySuperClassId(java.lang.String)
 	 */
+	@Override
 	public ITool[] getToolsBySuperClassId(String id) {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getToolsBySuperClassId()"); //$NON-NLS-1$
@@ -707,6 +772,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#getUserObjects(java.lang.String)
 	 */
+	@Override
 	public String[] getUserObjects(String extension) {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getUserObjects()"); //$NON-NLS-1$
@@ -716,6 +782,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#hasOverriddenBuildCommand()
 	 */
+	@Override
 	public boolean hasOverriddenBuildCommand() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (fCfgs[i].hasOverriddenBuildCommand())
@@ -726,6 +793,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isBuilderCompatible(org.eclipse.cdt.managedbuilder.core.IBuilder)
 	 */
+	@Override
 	public boolean isBuilderCompatible(IBuilder builder) {
 		for (int i=0; i<fCfgs.length; i++)
 			if (! fCfgs[i].isBuilderCompatible(builder))
@@ -736,6 +804,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isDirty()
 	 */
+	@Override
 	public boolean isDirty() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (fCfgs[i].isDirty())
@@ -746,6 +815,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isExtensionElement()
 	 */
+	@Override
 	public boolean isExtensionElement() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.isExtensionElement()"); //$NON-NLS-1$
@@ -755,6 +825,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isHeaderFile(java.lang.String)
 	 */
+	@Override
 	public boolean isHeaderFile(String ext) {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.isHeaderFile()"); //$NON-NLS-1$
@@ -764,6 +835,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isManagedBuildOn()
 	 */
+	@Override
 	public boolean isManagedBuildOn() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (! fCfgs[i].isManagedBuildOn())
@@ -781,6 +853,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isSupported()
 	 */
+	@Override
 	public boolean isSupported() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (fCfgs[i].isSupported())
@@ -791,6 +864,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isSystemObject()
 	 */
+	@Override
 	public boolean isSystemObject() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (! fCfgs[i].isSystemObject())
@@ -801,6 +875,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#isTemporary()
 	 */
+	@Override
 	public boolean isTemporary() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (! fCfgs[i].isTemporary())
@@ -811,6 +886,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#needsFullRebuild()
 	 */
+	@Override
 	public boolean needsFullRebuild() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (fCfgs[i].needsFullRebuild())
@@ -821,6 +897,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#needsRebuild()
 	 */
+	@Override
 	public boolean needsRebuild() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (fCfgs[i].needsRebuild())
@@ -831,6 +908,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#removeResourceConfiguration(org.eclipse.cdt.managedbuilder.core.IResourceInfo)
 	 */
+	@Override
 	public void removeResourceConfiguration(IResourceInfo resConfig) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].removeResourceConfiguration(resConfig);
@@ -839,6 +917,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#removeResourceInfo(org.eclipse.core.runtime.IPath)
 	 */
+	@Override
 	public void removeResourceInfo(IPath path) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].removeResourceInfo(path);
@@ -847,6 +926,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setArtifactExtension(java.lang.String)
 	 */
+	@Override
 	public void setArtifactExtension(String extension) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setArtifactExtension(extension);
@@ -855,6 +935,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setArtifactName(java.lang.String)
 	 */
+	@Override
 	public void setArtifactName(String name) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setArtifactName(name);
@@ -863,6 +944,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setBuildArguments(java.lang.String)
 	 */
+	@Override
 	public void setBuildArguments(String makeArgs) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setBuildArguments(makeArgs);
@@ -871,6 +953,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setBuildArtefactType(java.lang.String)
 	 */
+	@Override
 	public void setBuildArtefactType(String id) throws BuildException {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setBuildArtefactType(id);
@@ -879,6 +962,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setBuildCommand(java.lang.String)
 	 */
+	@Override
 	public void setBuildCommand(String command) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setBuildCommand(command);
@@ -887,6 +971,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setCleanCommand(java.lang.String)
 	 */
+	@Override
 	public void setCleanCommand(String command) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setCleanCommand(command);
@@ -895,6 +980,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setDescription(java.lang.String)
 	 */
+	@Override
 	public void setDescription(String description) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setDescription(description);
@@ -903,6 +989,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setDirty(boolean)
 	 */
+	@Override
 	public void setDirty(boolean isDirty) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setDirty(isDirty);
@@ -911,6 +998,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setErrorParserIds(java.lang.String)
 	 */
+	@Override
 	public void setErrorParserIds(String ids) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setErrorParserIds(ids);
@@ -919,6 +1007,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setErrorParserList(java.lang.String[])
 	 */
+	@Override
 	public void setErrorParserList(String[] ids) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setErrorParserList(ids);
@@ -927,6 +1016,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setManagedBuildOn(boolean)
 	 */
+	@Override
 	public void setManagedBuildOn(boolean on) throws BuildException {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setManagedBuildOn(on);
@@ -935,11 +1025,13 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setName(java.lang.String)
 	 */
+	@Override
 	public void setName(String name) {} // do nothing 
 
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setOption(org.eclipse.cdt.managedbuilder.core.IHoldsOptions, org.eclipse.cdt.managedbuilder.core.IOption, boolean)
 	 */
+	@Override
 	public IOption setOption(IHoldsOptions parent, IOption option, boolean value)
 			throws BuildException {
 		IOption op = null;
@@ -951,6 +1043,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setOption(org.eclipse.cdt.managedbuilder.core.IHoldsOptions, org.eclipse.cdt.managedbuilder.core.IOption, java.lang.String)
 	 */
+	@Override
 	public IOption setOption(IHoldsOptions parent, IOption option, String value)
 			throws BuildException {
 		IOption op = null;
@@ -962,6 +1055,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setOption(org.eclipse.cdt.managedbuilder.core.IHoldsOptions, org.eclipse.cdt.managedbuilder.core.IOption, java.lang.String[])
 	 */
+	@Override
 	public IOption setOption(IHoldsOptions parent, IOption option,
 			String[] value) throws BuildException {
 		IOption op = null;
@@ -973,6 +1067,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setPostannouncebuildStep(java.lang.String)
 	 */
+	@Override
 	public void setPostannouncebuildStep(String announceStep) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setPostannouncebuildStep(announceStep);
@@ -981,6 +1076,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setPostbuildStep(java.lang.String)
 	 */
+	@Override
 	public void setPostbuildStep(String step) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setPostbuildStep(step);
@@ -989,6 +1085,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setPreannouncebuildStep(java.lang.String)
 	 */
+	@Override
 	public void setPreannouncebuildStep(String announceStep) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setPreannouncebuildStep(announceStep);
@@ -997,6 +1094,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setPrebuildStep(java.lang.String)
 	 */
+	@Override
 	public void setPrebuildStep(String step) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setPrebuildStep(step);
@@ -1005,6 +1103,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setRebuildState(boolean)
 	 */
+	@Override
 	public void setRebuildState(boolean rebuild) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setRebuildState(rebuild);
@@ -1013,6 +1112,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setSourceEntries(org.eclipse.cdt.core.settings.model.ICSourceEntry[])
 	 */
+	@Override
 	public void setSourceEntries(ICSourceEntry[] entries) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setSourceEntries(entries);
@@ -1021,6 +1121,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#setToolCommand(org.eclipse.cdt.managedbuilder.core.ITool, java.lang.String)
 	 */
+	@Override
 	public void setToolCommand(ITool tool, String command) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].setToolCommand(tool, command);
@@ -1029,6 +1130,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IConfiguration#supportsBuild(boolean)
 	 */
+	@Override
 	public boolean supportsBuild(boolean managed) {
 		for (int i=0; i<fCfgs.length; i++)
 			if (! fCfgs[i].supportsBuild(managed))
@@ -1039,6 +1141,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IBuildObject#getBaseId()
 	 */
+	@Override
 	public String getBaseId() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getBaseId()"); //$NON-NLS-1$
@@ -1048,6 +1151,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IBuildObject#getId()
 	 */
+	@Override
 	public String getId() {
 		return curr().getId() + "_etc"; //$NON-NLS-1$
 	}
@@ -1055,6 +1159,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IBuildObject#getManagedBuildRevision()
 	 */
+	@Override
 	public String getManagedBuildRevision() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getMngBuildRevision()"); //$NON-NLS-1$
@@ -1064,6 +1169,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IBuildObject#getName()
 	 */
+	@Override
 	public String getName() {
 		return "Multiple configurations"; //$NON-NLS-1$
 	}
@@ -1071,6 +1177,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IBuildObject#getVersion()
 	 */
+	@Override
 	public Version getVersion() {
 		if (DEBUG)
 			System.out.println("Strange multi access: MultiConfiguration.getVersion()"); //$NON-NLS-1$
@@ -1080,61 +1187,69 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IBuildObject#setVersion(org.eclipse.core.runtime.PluginVersionIdentifier)
 	 */
+	@Override
 	public void setVersion(Version version) {} // do nothing
 
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.managedbuilder.core.IBuildObjectPropertiesContainer#getBuildProperties()
 	 */
+	@Override
 	public IBuildObjectProperties getBuildProperties() {
 		return curr().getBuildProperties();
 	}
 
+	@Override
 	public boolean getParallelDef() {
-		for (int i=0; i<fCfgs.length; i++)
+		for (IConfiguration cfg : fCfgs) {
-			if (fCfgs[i] instanceof Configuration) {
+			if (cfg instanceof Configuration) {
-				if (!((Configuration)fCfgs[i]).getParallelDef())
+				if (!((Configuration)cfg).getParallelDef())
 					return false;
 			} else
 				return false;
+		}
 		return true; // all cfgs report true
 	}
 	
-	public void setParallelDef(boolean def) {
+	@Override
-		for (int i=0; i<fCfgs.length; i++)
+	public void setParallelDef(boolean parallel) {
-			if (fCfgs[i] instanceof Configuration)
+		for (IConfiguration cfg : fCfgs) {
-				((Configuration)fCfgs[i]).setParallelDef(def);
+			if (cfg instanceof Configuration)
+				((Configuration)cfg).setParallelDef(parallel);
+		}
 	}
 	
+	@Override
 	public int getParallelNumber() {
-		int res = -1;
+		int res = 0;
-		for (int i=0; i<fCfgs.length; i++)
+		for (IConfiguration cfg : fCfgs) {
-			if (fCfgs[i] instanceof Configuration) {
+			if (cfg instanceof Configuration) {
-				int x = ((Configuration)fCfgs[i]).getParallelNumber();
+				int num = ((Configuration)cfg).getParallelNumber();
-				if (res == -1) 
+				Assert.isTrue(num != 0); // can't be 0, see IMakeCommonBuildInfo.getParallelizationNum()
-					res = x;
+
-				else if (res != x)
+				if (res == 0) 
+					res = num;
+				else if (res != num)
 					return 0; // values are different !
 			} else
 				return 0;
-		return (res == -1 ? 0: res); // all cfgs report true
+		}
+		return res; // all cfgs report same value
 	}
 	
+	@Override
 	public void setParallelNumber(int num) {
-		for (int i=0; i<fCfgs.length; i++)
+		for (IConfiguration cfg : fCfgs) {
-			if (fCfgs[i] instanceof Configuration)
+			if (cfg instanceof Configuration)
-				((Configuration)fCfgs[i]).setParallelNumber(num);
+				((Configuration)cfg).setParallelNumber(num);
+		}
 	}
 	
+	@Override
 	public boolean getInternalBuilderParallel() {
-		for (int i=0; i<fCfgs.length; i++)
+		return getParallelDef();
-			if (fCfgs[i] instanceof Configuration) {
-				if (!((Configuration)fCfgs[i]).getInternalBuilderParallel())
-					return false;
-			} else
-				return false;
-		return true; // all cfgs report true
 	}
 	
+	@Override
 	public boolean isInternalBuilderEnabled() {
 		for (int i=0; i<fCfgs.length; i++)
 			if (fCfgs[i] instanceof Configuration) {
@@ -1145,6 +1260,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 		return true; // all cfgs report true
 	}
 
+	@Override
 	public boolean canEnableInternalBuilder(boolean v) {
 		for (int i=0; i<fCfgs.length; i++)
 			if (fCfgs[i] instanceof Configuration) {
@@ -1155,6 +1271,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 		return true; // all cfgs report true
 	}
 	
+	@Override
 	public void enableInternalBuilder(boolean v) {
 		for (int i=0; i<fCfgs.length; i++)
 			if (fCfgs[i] instanceof Configuration)
@@ -1168,6 +1285,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 		return fCfgs[curr];
 	}
 
+	@Override
 	public String getToolOutputPrefix() {
 		String s = fCfgs[0].calculateTargetTool().getOutputPrefix();
 		if (s == null || s.length() == 0)
@@ -1178,11 +1296,13 @@ public class MultiConfiguration extends MultiItemsHolder implements
 		return s;
 	}
 
+	@Override
 	public void setOutputPrefixForPrimaryOutput(String pref) {
 		for (int i=0; i<fCfgs.length; i++)
 			fCfgs[i].calculateTargetTool().setOutputPrefixForPrimaryOutput(pref);
 	}
 
+	@Override
 	public IBuildProperty getBuildProperty(String id) {
 		IBuildProperty b = fCfgs[0].getBuildProperties().getProperty(id);
 		if (b == null )
@@ -1196,6 +1316,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 	}
 
 	// Performing conjunction of supported values for each cfg
+	@Override
 	public IBuildPropertyValue[] getSupportedValues(String id) {
 		IBuildPropertyValue[] a = fCfgs[0].getBuildProperties().getSupportedValues(id);
 		if (a == null || a.length == 0)
@@ -1232,6 +1353,7 @@ public class MultiConfiguration extends MultiItemsHolder implements
 		}
 	}
 
+	@Override
 	public void setBuildProperty(String id, String val) {
 		try {
 			for (int i=0; i<fCfgs.length; i++)

build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/newmake/core/IMakeCommonBuildInfo.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2004, 2010 QNX Software Systems and others.
+ * Copyright (c) 2004, 2011 QNX Software Systems and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -12,6 +12,7 @@ package org.eclipse.cdt.newmake.core;
 
 import java.util.Map;
 
+import org.eclipse.cdt.managedbuilder.internal.core.Builder;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 
@@ -42,10 +43,45 @@ public interface IMakeCommonBuildInfo {
 	void setStopOnError(boolean on) throws CoreException;
 	boolean supportsStopOnError(boolean on);
 
+	/**
+	 * @return the current number of parallel jobs.
+	 * The value of the number is encoded as follows:
+	 * <pre>
+	 *  Status       Returns
+	 * No parallel      1       
+	 * Unlimited    Integer.MAX  (N/A for Internal Builder)
+	 * Optimal       -CPU#       (negative number of processors) 
+	 * Specific        >0        (positive number)
+	 * </pre>
+	 */
 	int getParallelizationNum();
-	void setParallelizationNum(int num) throws CoreException;
+
+	/**
+	 * Sets maximum number of parallel threads/jobs to be used by builder.
+	 * Note that the number will be set only if the builder is in "parallel"
+	 * mode.
+	 * 
+	 * @param jobs - number of jobs according table {@link #getParallelizationNum()}.
+	 *    Any number <=0 is treated as setting "optimal" property,
+	 *    the value of the number itself is ignored.
+	 */
+	void setParallelizationNum(int jobs) throws CoreException;
+	/**
+	 * @return {@code true} if builder supports parallel build,
+	 *    {@code false} otherwise.
+	 */
 	boolean supportsParallelBuild();
+	/**
+	 * @return {@code true} if builder support for parallel build is enabled,
+	 *    {@code false} otherwise.
+	 */
 	boolean isParallelBuildOn();
+	/**
+	 * Set parallel execution mode for the builder.
+	 * @see Builder#setParallelBuildOn(boolean)
+	 * 
+	 * @param on - the flag to enable or disable parallel mode.
+	 */
 	void setParallelBuildOn(boolean on) throws CoreException;
 
 	boolean isDefaultBuildCmd();

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/Messages.java

@@ -27,9 +27,10 @@ public class Messages extends NLS {
 	public static String BuilderSettingsTab_0;
 	public static String BuilderSettingsTab_1;
 	public static String BuilderSettingsTab_10;
-	public static String BuilderSettingsTab_11;
+	public static String BuilderSettingsTab_EnableParallelBuild;
-	public static String BuilderSettingsTab_12;
+	public static String BuilderSettingsTab_UseOptimalJobs;
-	public static String BuilderSettingsTab_13;
+	public static String BuilderSettingsTab_UseUnlimitedJobs;
+	public static String BuilderSettingsTab_UseParallelJobs;
 	public static String BuilderSettingsTab_14;
 	public static String BuilderSettingsTab_15;
 	public static String BuilderSettingsTab_16;

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/Messages.properties

@@ -31,9 +31,10 @@ BuilderSettingsTab_7=&Generate Makefiles automatically
 BuilderSettingsTab_8=&Expand Env. Variable Refs in Makefiles
 BuilderSettingsTab_9=Build settings
 BuilderSettingsTab_10=Stop on first build error
-BuilderSettingsTab_11=Use parallel build
+BuilderSettingsTab_EnableParallelBuild=Enable parallel build
-BuilderSettingsTab_12=Use optimal jobs number
+BuilderSettingsTab_UseOptimalJobs=Use number of processors ({0})
-BuilderSettingsTab_13=Use parallel jobs: 
+BuilderSettingsTab_UseParallelJobs=Use parallel jobs: 
+BuilderSettingsTab_UseUnlimitedJobs=Use unlimited jobs
 BuilderSettingsTab_14=Workbench Build Behavior
 BuilderSettingsTab_15=Workbench build type:
 BuilderSettingsTab_16=Make build target:

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/properties/BuildBehaviourTab.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2007, 2010  Intel Corporation and others.
+ * Copyright (c) 2007, 2011 Intel Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -11,6 +11,8 @@
  *******************************************************************************/
 package org.eclipse.cdt.managedbuilder.ui.properties;
 
+import java.text.MessageFormat;
+
 import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
 import org.eclipse.cdt.core.settings.model.ICMultiConfigDescription;
 import org.eclipse.cdt.core.settings.model.ICMultiItemsHolder;
@@ -18,12 +20,12 @@ import org.eclipse.cdt.core.settings.model.ICResourceDescription;
 import org.eclipse.cdt.managedbuilder.core.IBuilder;
 import org.eclipse.cdt.managedbuilder.core.IConfiguration;
 import org.eclipse.cdt.managedbuilder.core.IMultiConfiguration;
-import org.eclipse.cdt.managedbuilder.internal.buildmodel.BuildProcessManager;
 import org.eclipse.cdt.managedbuilder.internal.core.Builder;
 import org.eclipse.cdt.managedbuilder.internal.core.Configuration;
 import org.eclipse.cdt.managedbuilder.internal.core.MultiConfiguration;
 import org.eclipse.cdt.managedbuilder.internal.ui.Messages;
 import org.eclipse.cdt.newmake.core.IMakeBuilderInfo;
+import org.eclipse.cdt.newmake.core.IMakeCommonBuildInfo;
 import org.eclipse.cdt.ui.newui.AbstractCPropertyTab;
 import org.eclipse.cdt.ui.newui.ICPropertyProvider;
 import org.eclipse.core.runtime.CoreException;
@@ -51,6 +53,7 @@ import org.eclipse.swt.widgets.Widget;
  * @noinstantiate This class is not intended to be instantiated by clients.
  */
 public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
+	private static final int SPINNER_MAX_VALUE = 10000;
 	
 	private static final int TRI_STATES_SIZE = 4;
 	// Widgets
@@ -58,9 +61,10 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 	private Button b_stopOnError; // 3
 	private Button b_parallel;    // 3
 
-	private Button b_parallelOpt;
+	private Button b_parallelOptimal;
-	private Button b_parallelNum;
+	private Button b_parallelSpecific;
-	private Spinner parallelProcesses;
+	private Button b_parallelUnlimited;
+	private Spinner s_parallelNumber;
 
 	private Label  title2;
 	private Button b_autoBuild; //3
@@ -70,11 +74,11 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 	private Button b_cmdClean; // 3
 	private Text   t_cmdClean;	
 
-	private IBuilder bldr;
+	private Builder bldr;
 	private IConfiguration icfg;
 	private boolean canModify = true;
 	
-	protected final int cpuNumber = BuildProcessManager.checkCPUNumber(); 
+	protected final int cpuNumber = Runtime.getRuntime().availableProcessors(); 
 	
 	@Override
 	public void createControls(Composite parent) {
@@ -110,7 +114,7 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 		gl.marginHeight = 0;
 		c2.setLayout(gl);
 		
-		b_parallel = setupCheck(c2, Messages.BuilderSettingsTab_11, 1, GridData.BEGINNING); 
+		b_parallel = setupCheck(c2, Messages.BuilderSettingsTab_EnableParallelBuild, 1, GridData.BEGINNING); 
 
 		Composite c3 = new Composite(g3, SWT.NONE);
 		setupControl(c3, 1, GridData.FILL_BOTH);
@@ -120,39 +124,60 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 		gl.marginHeight = 0;
 		c3.setLayout(gl);
 		
-		b_parallelOpt= new Button(c3, SWT.RADIO);
+		b_parallelOptimal= new Button(c3, SWT.RADIO);
-		b_parallelOpt.setText(Messages.BuilderSettingsTab_12); 
+		b_parallelOptimal.setText(MessageFormat.format(Messages.BuilderSettingsTab_UseOptimalJobs, 1)); 
-		setupControl(b_parallelOpt, 2, GridData.BEGINNING);
+		setupControl(b_parallelOptimal, 2, GridData.BEGINNING);
-		((GridData)(b_parallelOpt.getLayoutData())).horizontalIndent = 15;
+		((GridData)(b_parallelOptimal.getLayoutData())).horizontalIndent = 15;
-		b_parallelOpt.addSelectionListener(new SelectionAdapter() {
+		b_parallelOptimal.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent event) {
-				setParallelDef(b_parallelOpt.getSelection());
+				if (b_parallelOptimal.getSelection()) {
+					setParallelDef(true);
+					setParallelNumber(-1);
 					updateButtons();
+				}
 		 }});
 		
-		b_parallelNum= new Button(c3, SWT.RADIO);
+		b_parallelSpecific= new Button(c3, SWT.RADIO);
-		b_parallelNum.setText(Messages.BuilderSettingsTab_13); 
+		b_parallelSpecific.setText(Messages.BuilderSettingsTab_UseParallelJobs); 
-		setupControl(b_parallelNum, 1, GridData.BEGINNING);
+		setupControl(b_parallelSpecific, 1, GridData.BEGINNING);
-		((GridData)(b_parallelNum.getLayoutData())).horizontalIndent = 15;
+		((GridData)(b_parallelSpecific.getLayoutData())).horizontalIndent = 15;
-		b_parallelNum.addSelectionListener(new SelectionAdapter() {
+		b_parallelSpecific.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent event) {
-				setParallelDef(!b_parallelNum.getSelection());
+				if (b_parallelSpecific.getSelection()) {
+					setParallelDef(true);
+					setParallelNumber(s_parallelNumber.getSelection());
 					updateButtons();
+				}
 		 }});
 
-		parallelProcesses = new Spinner(c3, SWT.BORDER);
+		s_parallelNumber = new Spinner(c3, SWT.BORDER);
-		setupControl(parallelProcesses, 1, GridData.BEGINNING);
+		setupControl(s_parallelNumber, 1, GridData.BEGINNING);
-		parallelProcesses.setValues(cpuNumber, 1, 10000, 0, 1, 10);
+		s_parallelNumber.setValues(cpuNumber, 1, SPINNER_MAX_VALUE, 0, 1, 10);
-		parallelProcesses.addSelectionListener(new SelectionAdapter () {
+		s_parallelNumber.addSelectionListener(new SelectionAdapter () {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
-				setParallelNumber(parallelProcesses.getSelection());
+				setParallelDef(true);
+				setParallelNumber(s_parallelNumber.getSelection());
 				updateButtons();
 			}
 		});
 		
+		b_parallelUnlimited= new Button(c3, SWT.RADIO);
+		b_parallelUnlimited.setText(Messages.BuilderSettingsTab_UseUnlimitedJobs); 
+		setupControl(b_parallelUnlimited, 2, GridData.BEGINNING);
+		((GridData)(b_parallelUnlimited.getLayoutData())).horizontalIndent = 15;
+		b_parallelUnlimited.addSelectionListener(new SelectionAdapter() {
+			@Override
+			public void widgetSelected(SelectionEvent event) {
+				if (b_parallelUnlimited.getSelection()) {
+					setParallelDef(true);
+					setParallelNumber(Integer.MAX_VALUE);
+					updateButtons();
+				}
+		 }});
+		
 		// Workbench behaviour group
 		AccessibleListener makeTargetLabelAccessibleListener = new AccessibleAdapter() {
 			@Override
@@ -166,6 +191,7 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 		b_autoBuild = setupCheck(g4, Messages.BuilderSettingsTab_17, 1, GridData.BEGINNING); 
 		t_autoBuild = setupBlock(g4, b_autoBuild);
 		t_autoBuild.addModifyListener(new ModifyListener() {
+			@Override
 			public void modifyText(ModifyEvent e) {
 				if (canModify)
 					setBuildAttribute(IMakeBuilderInfo.BUILD_TARGET_AUTO, t_autoBuild.getText());
@@ -175,6 +201,7 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 		b_cmdBuild = setupCheck(g4, Messages.BuilderSettingsTab_19, 1, GridData.BEGINNING); 
 		t_cmdBuild = setupBlock(g4, b_cmdBuild);
 		t_cmdBuild.addModifyListener(new ModifyListener() {
+			@Override
 			public void modifyText(ModifyEvent e) {
 				if (canModify)
 					setBuildAttribute(IMakeBuilderInfo.BUILD_TARGET_INCREMENTAL, t_cmdBuild.getText());
@@ -183,6 +210,7 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 		b_cmdClean = setupCheck(g4, Messages.BuilderSettingsTab_20, 1, GridData.BEGINNING); 
 		t_cmdClean = setupBlock(g4, b_cmdClean);
 		t_cmdClean.addModifyListener(new ModifyListener() {
+			@Override
 			public void modifyText(ModifyEvent e) {
 				if (canModify)
 					setBuildAttribute(IMakeBuilderInfo.BUILD_TARGET_CLEAN, t_cmdClean.getText());
@@ -191,6 +219,7 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 	}
 
 	/**
+	 * Calculate enablements when multiple configurations selected on property page.
 	 * 
 	 * @return:
 	 * Mode 0:
@@ -202,55 +231,54 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 	 *    0: isStopOnError
 	 *    1: supportsStopOnError(true)
 	 *    2: bld.supportsStopOnError(false)  
-	 *    3: cfg.getInternalBuilderParallel()
+	 *    3: cfg.getParallelDef()
 	 * Mode 2:
 	 *    0: b.isAutoBuildEnable()
 	 *    1: b.isIncrementalBuildEnabled()
 	 *    2: b.isCleanBuildEnabled()
 	 *    3: getParallelDef()   
 	 */
-	 static int[] calc3states(ICPropertyProvider p, 
+	 static int[] calc3states(ICPropertyProvider p, IConfiguration mcfg, int mode) {
-			 IConfiguration c,
+		if (p.isMultiCfg() && mcfg instanceof ICMultiItemsHolder) { 
-			 int mode) {
+			boolean m0 = (mode == 0);
-		if (p.isMultiCfg() &&
+			boolean m1 = (mode == 1);
-			c instanceof ICMultiItemsHolder) 
-		{ 
-			boolean p0 = (mode == 0);
-			boolean p1 = (mode == 1);
 			
-			IConfiguration[] cfs = (IConfiguration[])((ICMultiItemsHolder)c).getItems();
+			IConfiguration[] cfgs = (IConfiguration[])((ICMultiItemsHolder)mcfg).getItems();
-			IBuilder b = cfs[0].getBuilder();
+			IBuilder bldr0 = cfgs[0].getBuilder();
 			int[] res = new int[TRI_STATES_SIZE];
-			boolean[] x = new boolean[TRI_STATES_SIZE];
+			boolean[] b = new boolean[TRI_STATES_SIZE];
-			x[0] = p0 ? b.isManagedBuildOn() : 
+			b[0] = m0 ? bldr0.isManagedBuildOn() : 
-				(p1 ? b.isStopOnError() : b.isAutoBuildEnable());
+				(m1 ? bldr0.isStopOnError() : bldr0.isAutoBuildEnable());
-			x[1] = p0 ? b.isDefaultBuildCmd(): 
+			b[1] = m0 ? bldr0.isDefaultBuildCmd(): 
-				(p1 ? b.supportsStopOnError(true) : b.isIncrementalBuildEnabled() );
+				(m1 ? bldr0.supportsStopOnError(true) : bldr0.isIncrementalBuildEnabled() );
-			x[2] = p0 ? b.canKeepEnvironmentVariablesInBuildfile() : 
+			b[2] = m0 ? bldr0.canKeepEnvironmentVariablesInBuildfile() : 
-				(p1 ? b.supportsStopOnError(false) : b.isCleanBuildEnabled());
+				(m1 ? bldr0.supportsStopOnError(false) : bldr0.isCleanBuildEnabled());
-			x[3] = p0 ? b.keepEnvironmentVariablesInBuildfile() : 
+			b[3] = m0 ? bldr0.keepEnvironmentVariablesInBuildfile() : 
-				( p1 ? ((Configuration)cfs[0]).getInternalBuilderParallel() : getParallelDef(c));
+				(m1 ? ((Configuration)cfgs[0]).getParallelDef() : getParallelDef(mcfg));
-			for (int i=1; i<cfs.length; i++) {
+			for (int i=1; i<cfgs.length; i++) {
-				b = cfs[i].getBuilder();
+				IBuilder bldr = cfgs[i].getBuilder();
-				if (x[0] != (p0 ? b.isManagedBuildOn() : 
+				if (b[0] != (m0 ? bldr.isManagedBuildOn() : 
-					(p1 ? b.isStopOnError() : b.isAutoBuildEnable())))
+						(m1 ? bldr.isStopOnError() : bldr.isAutoBuildEnable())))
 					res[0] = TRI_UNKNOWN;
-				if (x[1] != (p0 ? b.isDefaultBuildCmd() : 
+				if (b[1] != (m0 ? bldr.isDefaultBuildCmd() : 
-					(p1 ? b.supportsStopOnError(true) : b.isIncrementalBuildEnabled())))
+						(m1 ? bldr.supportsStopOnError(true) : bldr.isIncrementalBuildEnabled())))
 					res[1] = TRI_UNKNOWN;
-				if (x[2] != (p0 ? b.canKeepEnvironmentVariablesInBuildfile() : 
+				if (b[2] != (m0 ? bldr.canKeepEnvironmentVariablesInBuildfile() : 
-					(p1 ? b.supportsStopOnError(false) : b.isCleanBuildEnabled())))
+						(m1 ? bldr.supportsStopOnError(false) : bldr.isCleanBuildEnabled())))
 					res[2] = TRI_UNKNOWN;
-				if (x[3] != (p0 ? b.keepEnvironmentVariablesInBuildfile() : 
+				if ((b[3] != (m0 ? bldr.keepEnvironmentVariablesInBuildfile() : 
-					(p1 ? ((Configuration)cfs[i]).getInternalBuilderParallel() : getParallelDef(c))))
+						(m1 ? ((Configuration)cfgs[i]).getParallelDef() : getParallelDef(mcfg))))
+						|| ((IMultiConfiguration) mcfg).getParallelNumber() == 0) {
 					res[3] = TRI_UNKNOWN;
 				}
+			}
 			for (int i=0; i<TRI_STATES_SIZE; i++) {
 				if (res[i] != TRI_UNKNOWN)
-					res[i] = x[i] ? TRI_YES : TRI_NO;
+					res[i] = b[i] ? TRI_YES : TRI_NO;
 			}
 			return res;
-		} else
+		}
+		
 		return null;
 	}
 	
@@ -259,10 +287,11 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 	 */
 	@Override
 	protected void updateButtons() {
-		bldr = icfg.getEditableBuilder();
+		bldr = (Builder) icfg.getEditableBuilder();
 		canModify = false;
 		int[] extStates = calc3states(page, icfg, 1);
 		
+		// Stop on error
 		if (extStates != null) {
 			setTriSelection(b_stopOnError, extStates[0]);
 			b_stopOnError.setEnabled(
@@ -274,41 +303,61 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 					bldr.supportsStopOnError(true) &&
 					bldr.supportsStopOnError(false));
 		}
-		// parallel
+		
-		if (extStates == null) // no extended states
+		// Parallel build
-			setTriSelection(b_parallel, getInternalBuilderParallel());
+		boolean isParallelSupported = bldr.supportsParallelBuild();
-		else
+		boolean isExternalBuilder = ! isInternalBuilderEnabled();
+
+		b_parallel.setVisible(isParallelSupported);
+		b_parallelOptimal.setVisible(isParallelSupported);
+		b_parallelSpecific.setVisible(isParallelSupported);
+		b_parallelUnlimited.setVisible(isParallelSupported && isExternalBuilder);
+		s_parallelNumber.setVisible(isParallelSupported);
+
+		if (isParallelSupported) {
+			if (extStates == null) {
+				setTriSelection(b_parallel, getParallelDef());
+			} else {
 				setTriSelection(b_parallel, extStates[3]);
+			}
+			boolean isParallelSelected = b_parallel.getSelection();
+			int optimalParallelNumber = bldr.getOptimalParallelJobNum();
 
-		int n = getParallelNumber();
+			b_parallelOptimal.setText(MessageFormat.format(Messages.BuilderSettingsTab_UseOptimalJobs, optimalParallelNumber));
-		if (n < 0) n = -n;
+			b_parallelOptimal.setEnabled(isParallelSelected);
-		parallelProcesses.setSelection(n);
+			b_parallelSpecific.setEnabled(isParallelSelected);
-
+			b_parallelUnlimited.setEnabled(isParallelSelected && isExternalBuilder);
-		b_parallel.setVisible(bldr.supportsParallelBuild());
-		b_parallelOpt.setVisible(bldr.supportsParallelBuild());
-		b_parallelNum.setVisible(bldr.supportsParallelBuild());
-		parallelProcesses.setVisible(bldr.supportsParallelBuild());
 	
 			extStates = calc3states(page, icfg, 2);
 			if (extStates == null) {
 				setTriSelection(b_autoBuild, bldr.isAutoBuildEnable());
 				setTriSelection(b_cmdBuild, bldr.isIncrementalBuildEnabled());
 				setTriSelection(b_cmdClean, bldr.isCleanBuildEnabled());
-			b_parallelOpt.setSelection(getParallelDef(icfg));
+			} else { // multiple configurations selected
-			b_parallelNum.setSelection(!getParallelDef(icfg));
-		} else {
 				setTriSelection(b_autoBuild, extStates[0]);
 				setTriSelection(b_cmdBuild, extStates[1]);
 				setTriSelection(b_cmdClean, extStates[2]);
-			if (extStates[3] == TRI_UNKNOWN) {
+			}
-				b_parallelOpt.setSelection(false);
+			if ((extStates == null || extStates[3] != TRI_UNKNOWN) && isParallelSelected) {
-				b_parallelNum.setSelection(false);
+				// single configuration or matching multiple configurations here
+				int parallelNumber = getParallelNumber();
+				boolean isOptimal = parallelNumber <= 0;
+				boolean isUnlimited = parallelNumber == Integer.MAX_VALUE;
+				b_parallelOptimal.setSelection(isOptimal);
+				b_parallelSpecific.setSelection(!isOptimal && !isUnlimited);
+				b_parallelUnlimited.setSelection(isUnlimited);
+				s_parallelNumber.setEnabled(b_parallelSpecific.getEnabled() && b_parallelSpecific.getSelection());
+				s_parallelNumber.setSelection(s_parallelNumber.isEnabled() ? parallelNumber : optimalParallelNumber);
 			} else {
-				b_parallelOpt.setSelection(getParallelDef(icfg));
+				b_parallelOptimal.setSelection(true);
-				b_parallelNum.setSelection(!getParallelDef(icfg));
+				b_parallelSpecific.setSelection(false);
+				b_parallelUnlimited.setSelection(false);
+				s_parallelNumber.setEnabled(false);
+				s_parallelNumber.setSelection(optimalParallelNumber);
 			}
 		}
 		
+		// Build commands
 		if (page.isMultiCfg()) {
 			MultiConfiguration mc = (MultiConfiguration)icfg;
 			t_autoBuild.setText(mc.getBuildAttribute(IBuilder.BUILD_TARGET_AUTO, EMPTY_STR));
@@ -321,12 +370,6 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 		}
 		
 		boolean external = ! isInternalBuilderEnabled();
-		boolean parallel = b_parallel.getSelection();
-
-		b_parallelNum.setEnabled(parallel);
-		b_parallelOpt.setEnabled(parallel);
-		parallelProcesses.setEnabled(parallel & b_parallelNum.getSelection());
-		
 		title2.setVisible(external);
 		t_autoBuild.setVisible(external);
 		((Control)t_autoBuild.getData()).setVisible(external);
@@ -496,6 +539,14 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 		return false;
 	}
 	
+	private boolean getParallelDef() {
+		if (icfg instanceof Configuration) 
+			return ((Configuration)icfg).getParallelDef();
+		if (icfg instanceof IMultiConfiguration)
+			return ((IMultiConfiguration)icfg).getParallelDef();
+		return false;
+	}
+	
 	private void setParallelDef(boolean def) {
 		if (icfg instanceof Configuration) 
 			((Configuration)icfg).setParallelDef(def);
@@ -503,6 +554,9 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 			((IMultiConfiguration)icfg).setParallelDef(def);
 	}
 	
+	/**
+	 * @see IMakeCommonBuildInfo#getParallelizationNum() for interpretation of the number.
+	 */
 	private int getParallelNumber() {
 		if (icfg instanceof Configuration) 
 			return ((Configuration)icfg).getParallelNumber();
@@ -517,14 +571,6 @@ public class BuildBehaviourTab extends AbstractCBuildPropertyTab {
 			((IMultiConfiguration)icfg).setParallelNumber(num);
 	}
 	
-	private boolean getInternalBuilderParallel() {
-		if (icfg instanceof Configuration) 
-			return ((Configuration)icfg).getInternalBuilderParallel();
-		if (icfg instanceof IMultiConfiguration)
-			return ((IMultiConfiguration)icfg).getInternalBuilderParallel();
-		return false;
-	}
-
 	private boolean isInternalBuilderEnabled() {
 		if (icfg instanceof Configuration) 
 			return ((Configuration)icfg).isInternalBuilderEnabled();

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/properties/BuilderSettingsTab.java

@@ -171,7 +171,7 @@ public class BuilderSettingsTab extends AbstractCBuildPropertyTab {
 				canEnableInternalBuilder(true) &&
 				canEnableInternalBuilder(false));
 		
-		t_buildCmd.setText(getMC());
+		t_buildCmd.setText(getMakeCommand());
 		
 		if (page.isMultiCfg()) {
 			group_dir.setVisible(false);
@@ -293,11 +293,14 @@ public class BuilderSettingsTab extends AbstractCBuildPropertyTab {
 	/**
 	 * @return make command
 	 */
-	private String getMC() {
+	private String getMakeCommand() {
-		String makeCommand = bldr.getCommand();
+		String makeCommand = icfg.getBuildCommand();
-		String makeArgs = bldr.getArguments();
+		String makeArgs = icfg.getBuildArguments();
-		if (makeArgs != null) {	makeCommand += " " + makeArgs; } //$NON-NLS-1$
+
-		return makeCommand;
+		if (!makeCommand.isEmpty() && makeArgs != null) {
+			return makeCommand + " " + makeArgs; //$NON-NLS-1$
+		}
+		return EMPTY_STR;
 	}
 	/**
 	 * Performs common settings for all controls