Toolchain modification page:

- "no toolchain" handling added
- conditional page display (if permitted in prefs)

build/org.eclipse.cdt.managedbuilder.ui/plugin.xml

@@ -596,6 +596,8 @@
                value="org.eclipse.cdt.managedbuilder.core.managedBuildNature">
          </filter>
          <enabledWhen>
+            <and>
+               <test property="org.eclipse.cdt.ui.toolEditEnabled" value="" />
             <or>
 		     <instanceof value="org.eclipse.core.resources.IProject"/>
 		     <instanceof value="org.eclipse.cdt.core.model.ICProject"/>
@@ -612,6 +614,7 @@
     	        <test property="org.eclipse.cdt.ui.isSource" value="" />
 	         </and>	
 		    </or>
+		    </and>          
          </enabledWhen>
       </page>
   </extension>

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

@@ -31,6 +31,8 @@ import org.eclipse.swt.widgets.Group;
 import org.eclipse.swt.widgets.Text;
 
 public class ToolChainEditTab extends AbstractCBuildPropertyTab {
+	
+	private static final String NO_TC = Messages.getString("StdProjectTypeHandler.0");  //$NON-NLS-1$
 	private static final IToolChain[] r_tcs = ManagedBuildManager.getRealToolChains();
 	private static final IBuilder[]    r_bs = ManagedBuildManager.getRealBuilders();
 	private static final ITool[]    r_tools = ManagedBuildManager.getRealTools();
@@ -39,6 +41,7 @@ public class ToolChainEditTab extends AbstractCBuildPropertyTab {
 	private Button b_dispCompatible;
 	private Combo  c_toolchain;
 	private Combo  c_builder;
+	private Button button_edit;
 	
 	private IBuilder[] v_bs;
 	private IToolChain[] v_tcs;
@@ -51,10 +54,8 @@ public class ToolChainEditTab extends AbstractCBuildPropertyTab {
 	public void createControls(Composite parent) {
 		super.createControls(parent);
 		usercomp.setLayout(new GridLayout(2, false));
-
 		b_dispCompatible = setupCheck(usercomp, Messages.getString("ToolChainEditTab.0"), 2, GridData.BEGINNING); //$NON-NLS-1$
 
-		
 		setupLabel(usercomp, Messages.getString("ToolChainEditTab.1"), 2, GridData.BEGINNING); //$NON-NLS-1$
 		c_toolchain = new Combo(usercomp, SWT.BORDER);
 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
@@ -64,10 +65,14 @@ public class ToolChainEditTab extends AbstractCBuildPropertyTab {
 			public void widgetSelected(SelectionEvent e) {
 				if (fi != null) {
 					int x = c_toolchain.getSelectionIndex();
+					try {
+						if (NO_TC.equals(c_toolchain.getItem(x))) {
+							fi.changeToolChain(null, null, null);
+						} else {
 							IToolChain tc = v_tcs[x];
 							if (tc == null) return;
-					try {
 							fi.changeToolChain(tc, ManagedBuildManager.calculateChildId(tc.getId(), null), tc.getUniqueRealName());
+					}
 					} catch (BuildException be) {}
 					updateData();
 				}
@@ -97,13 +102,13 @@ public class ToolChainEditTab extends AbstractCBuildPropertyTab {
 		gd.grabExcessHorizontalSpace = true;
 		text.setLayoutData(gd);
 		
-		Button b = new Button(g, SWT.PUSH);
+		button_edit = new Button(g, SWT.PUSH);
 		GridData gdb = new GridData(GridData.VERTICAL_ALIGN_CENTER);
 		gdb.grabExcessHorizontalSpace = false;
 		gdb.horizontalAlignment = SWT.FILL;
 		gdb.widthHint = 80;
-		b.setLayoutData(gdb);
+		button_edit.setLayoutData(gdb);
-		b.addSelectionListener(new SelectionAdapter() {
+		button_edit.addSelectionListener(new SelectionAdapter() {
 	        public void widgetSelected(SelectionEvent event) {
 	    		ToolSelectionDialog d = new ToolSelectionDialog(usercomp.getShell());
 	    		d.all = v_tools;
@@ -119,8 +124,8 @@ public class ToolChainEditTab extends AbstractCBuildPropertyTab {
 	    		}
 	        }});
 
-		b.setLayoutData(new GridData(GridData.END));
+		button_edit.setLayoutData(new GridData(GridData.END));
-		b.setText(Messages.getString("ToolChainEditTab.4")); //$NON-NLS-1$
+		button_edit.setText(Messages.getString("ToolChainEditTab.4")); //$NON-NLS-1$
 	}
 	public void updateData(ICResourceDescription rcfg) {
 		cfg = getCfg(rcfg.getConfiguration());
@@ -137,9 +142,8 @@ public class ToolChainEditTab extends AbstractCBuildPropertyTab {
 		v_tools = new ITool[r_tools.length];
 		
 		IToolChain tc = null;
-		if (fi != null) {
+		if (fi != null)
 			tc = ManagedBuildManager.getRealToolChain(fi.getToolChain());
-		}
 		
 		int cnt = 0;
 		int pos = -1;
@@ -154,10 +158,26 @@ public class ToolChainEditTab extends AbstractCBuildPropertyTab {
 			if (r_tcs[i].equals(tc)) pos = cnt;
 			cnt++;
 		}
-		if (pos != -1)
+		// "No toolchain" is enabled for Make projects only.
+		if (!cfg.getBuilder().isManagedBuildOn())
+			c_toolchain.add(NO_TC);
+		if (pos != -1) {
 			c_toolchain.select(pos);
-		else
+			c_builder.setEnabled(true);
-			c_toolchain.setText(EMPTY_STR);
+			button_edit.setEnabled(true);
+		}
+		else {
+			if (cfg.getBuilder().isManagedBuildOn()) {
+				c_toolchain.setText(EMPTY_STR); // unprobable case
+			} else {
+				try {
+					fi.changeToolChain(null, null, null);
+				} catch (BuildException e) {}
+				c_toolchain.select(c_toolchain.getItemCount() - 1);
+			}
+			c_builder.setEnabled(false);
+			button_edit.setEnabled(false);
+		}
 		
 		IBuilder b = ManagedBuildManager.getRealBuilder(cfg.getBuilder());
 		cnt = 0;

core/org.eclipse.cdt.ui/plugin.xml

@@ -1914,14 +1914,26 @@
            id="org.eclipse.cdt.Tester1"
            class="org.eclipse.cdt.ui.newui.PropertyTester"
            namespace="org.eclipse.cdt.ui"
-           properties="isSource"
+           properties="isSource,toolEditEnabled"
            type="org.eclipse.cdt.core.model.ITranslationUnit"/>
       <propertyTester
            id="org.eclipse.cdt.Tester2"
            class="org.eclipse.cdt.ui.newui.PropertyTester"
            namespace="org.eclipse.cdt.ui"
-           properties="isSource"
+           properties="isSource,toolEditEnabled"
            type="org.eclipse.core.resources.IFile"/>
+      <propertyTester
+           id="org.eclipse.cdt.Tester3"
+           class="org.eclipse.cdt.ui.newui.PropertyTester"
+           namespace="org.eclipse.cdt.ui"
+           properties="toolEditEnabled"
+           type="org.eclipse.cdt.core.model.IResource"/>
+      <propertyTester
+           id="org.eclipse.cdt.Tester4"
+           class="org.eclipse.cdt.ui.newui.PropertyTester"
+           namespace="org.eclipse.cdt.ui"
+           properties="toolEditEnabled"
+           type="org.eclipse.cdt.core.model.ICElement"/>
   </extension>
   <extension
         point="org.eclipse.ui.exportWizards">

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractPage.java

@@ -199,7 +199,8 @@ implements
 		if (!checkElement()) {
 			s = UIMessages.getString("AbstractPage.0"); //$NON-NLS-1$
 		} else if (!isApplicable()) {
-			s = UIMessages.getString("AbstractPage.1"); //$NON-NLS-1$
+			return null;
+//			s = UIMessages.getString("AbstractPage.1"); //$NON-NLS-1$
 		} else if (!isCDTProject(getProject())) {
 			s = UIMessages.getString("AbstractPage.2"); //$NON-NLS-1$
 		}

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/CDTPrefUtil.java

@@ -26,6 +26,7 @@ public class CDTPrefUtil {
 	public static final String KEY_MULTI  = "properties.multi.config.enable"; //$NON-NLS-1$
 	public static final String KEY_DTREE  = "properties.data.hierarchy.enable"; //$NON-NLS-1$
 	public static final String KEY_NOSAVE  = "properties.save.position.disable"; //$NON-NLS-1$
+	public static final String KEY_TOOLM  = "properties.toolchain.modification.enable"; //$NON-NLS-1$
 	// string keys
 	public static final String KEY_PREFTC  = "wizard.preferred.toolchains";  //$NON-NLS-1$
 

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/PluginResources.properties

@@ -340,6 +340,7 @@ PropertyPageDefsTab.0=Show <Manage configurations> button
 PropertyPageDefsTab.1=Display <Data hierarchy> tab
 PropertyPageDefsTab.2=Enable multiple configurations setting
 PropertyPageDefsTab.3=Save property dialog size and position
+PropertyPageDefsTab.4=Display <Toolchain modification> tab
 ProjectConvert.convertersList=Converters List
 			        
 ScannerConfigOptionsDialog.title=Discovery Options

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/PropertyPageDefsTab.java

@@ -24,6 +24,7 @@ public class PropertyPageDefsTab extends AbstractCPropertyTab {
     private Button show_mul;
     private Button show_mng;
     private Button show_sav;
+    private Button show_tool;
 
 	public void createControls(Composite parent) {
 		super.createControls(parent);
@@ -45,12 +46,17 @@ public class PropertyPageDefsTab extends AbstractCPropertyTab {
         show_sav.setText(UIMessages.getString("PropertyPageDefsTab.3")); //$NON-NLS-1$
         show_sav.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 
+		show_tool = new Button(usercomp, SWT.CHECK);
+        show_tool.setText(UIMessages.getString("PropertyPageDefsTab.4")); //$NON-NLS-1$
+        show_tool.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
+
         show_tree.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_DTREE));
 		show_mul.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_MULTI));
 		show_mng.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOMNG));
 		show_sav.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOSAVE));
+		show_tool.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_TOOLM));
 		
-		show_mul.setEnabled(false);
+		show_mul.setVisible(false); // temporary
 	}
 
 	protected void performOK() {
@@ -58,12 +64,14 @@ public class PropertyPageDefsTab extends AbstractCPropertyTab {
 		CDTPrefUtil.setBool(CDTPrefUtil.KEY_MULTI, show_mul.getSelection());
 		CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOMNG, !show_mng.getSelection());
 		CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOSAVE, !show_sav.getSelection());
+		CDTPrefUtil.setBool(CDTPrefUtil.KEY_TOOLM, show_tool.getSelection());
 	}
 	protected void performDefaults() {
 		show_tree.setSelection(false);
 		show_mul.setSelection(false);
 		show_mng.setSelection(true);
 		show_mng.setSelection(true);
+		show_tool.setSelection(false);
 	}
 
 	protected void performApply(ICResourceDescription src, ICResourceDescription dst) { performOK(); }

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/PropertyTester.java

@@ -19,12 +19,12 @@ import org.eclipse.cdt.core.model.ITranslationUnit;
  * Checks whether given object is a source file.
  */
 public class PropertyTester extends org.eclipse.core.expressions.PropertyTester {
-	private static final String KEY = "isSource"; //$NON-NLS-1$
+	private static final String KEY_SRC = "isSource"; //$NON-NLS-1$
+	private static final String KEY_TOOL = "toolEditEnabled"; //$NON-NLS-1$
 	
 	public boolean test(Object receiver, String property, Object[] args,
 			Object expectedValue) {
-		if (!KEY.equals(property)) return false;
+		if (KEY_SRC.equals(property)) {
-		
 			if (receiver instanceof ITranslationUnit) {
 				return ((ITranslationUnit)receiver).isSourceUnit();
 			}
@@ -32,7 +32,10 @@ public class PropertyTester extends org.eclipse.core.expressions.PropertyTester
 				IFile file = (IFile)receiver;
 				return CoreModel.isValidSourceUnitName(file.getProject(), file.getName());
 			}
-		else return false;
+		} else if (KEY_TOOL.equals(property)) {
+			return CDTPrefUtil.getBool(CDTPrefUtil.KEY_TOOLM);
+		}
+		return false;
 	}
 
 }