Bug 527818 - Clean up handling of missing toolchain file

If we're building for non-local targets we need a toolchain
file. Print out an error message when it's missing at build
time. Recover when one is added.

Also a rider that makes sure the Makefile projects are
marked experimental.

Change-Id: I0c295dc5b3d71a04c60c3385ce790553f172859d

build/org.eclipse.cdt.cmake.core/src/org/eclipse/cdt/cmake/core/internal/CMakeBuildConfiguration.java

@@ -28,6 +28,7 @@ import org.eclipse.cdt.core.build.CBuildConfiguration;
 import org.eclipse.cdt.core.build.IToolChain;
 import org.eclipse.cdt.core.model.ICModelMarker;
 import org.eclipse.cdt.core.resources.IConsole;
+import org.eclipse.cdt.utils.Platform;
 import org.eclipse.core.resources.IBuildConfiguration;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResource;
@@ -90,6 +91,12 @@ public class CMakeBuildConfiguration extends CBuildConfiguration {
 		}
 	}
 
+	private boolean isLocal() throws CoreException {
+		IToolChain toolchain = getToolChain();
+		return Platform.getOS().equals(toolchain.getProperty(IToolChain.ATTR_OS))
+				&& Platform.getOSArch().equals(toolchain.getProperty(IToolChain.ATTR_ARCH));
+	}
+
 	@Override
 	public IProject[] build(int kind, Map<String, String> args, IConsole console, IProgressMonitor monitor)
 			throws CoreException {
@@ -109,6 +116,18 @@ public class CMakeBuildConfiguration extends CBuildConfiguration {
 
 			outStream.write(String.format(Messages.CMakeBuildConfiguration_BuildingIn, buildDir.toString()));
 
+			// Make sure we have a toolchain file if cross
+			if (toolChainFile == null && !isLocal()) {
+				ICMakeToolChainManager manager = Activator.getService(ICMakeToolChainManager.class);
+				toolChainFile = manager.getToolChainFileFor(getToolChain());
+				
+				if (toolChainFile == null) {
+					// error
+					console.getErrorStream().write(Messages.CMakeBuildConfiguration_NoToolchainFile);
+					return null;
+				}
+			}
+
 			boolean runCMake;
 			switch (generator) {
 			case "Ninja": //$NON-NLS-1$

build/org.eclipse.cdt.cmake.core/src/org/eclipse/cdt/cmake/core/internal/Messages.java

@@ -16,6 +16,7 @@ public class Messages extends NLS {
 	public static String CMakeBuildConfiguration_BuildingComplete;
 	public static String CMakeBuildConfiguration_Cleaning;
 	public static String CMakeBuildConfiguration_NotFound;
+	public static String CMakeBuildConfiguration_NoToolchainFile;
 	public static String CMakeBuildConfiguration_ProcCompCmds;
 	public static String CMakeBuildConfiguration_ProcCompJson;
 	static {

build/org.eclipse.cdt.cmake.core/src/org/eclipse/cdt/cmake/core/internal/messages.properties

@@ -10,5 +10,6 @@ CMakeBuildConfiguration_BuildingIn=Building in: %s\n
 CMakeBuildConfiguration_BuildingComplete=Build complete: %s\n
 CMakeBuildConfiguration_Cleaning=Cleaning %s
 CMakeBuildConfiguration_NotFound=CMakeFiles not found. Assuming clean.
+CMakeBuildConfiguration_NoToolchainFile=No toolchain file found for this target.
 CMakeBuildConfiguration_ProcCompCmds=Processing compile commands %s
 CMakeBuildConfiguration_ProcCompJson=Processing compile_commands.json

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

@@ -637,7 +637,7 @@
           label="Makefile Project"
           wizard="org.eclipse.cdt.make.internal.ui.wizards.NewMakefileProjectWizard">
        <description>
-          Create a new project that builds with the &apos;make&apos; build tool.
+          (Experimental) Create a new project that builds with the&apos;make&apos; build tool using CDT&apos;s new Core Build System.
        </description>
        <tagReference
              id="org.eclipse.cdt.ui.cdtTag">