Add an option to disable precompiled headers

svn path=/trunk/; revision=34186

reactos/Makefile

@@ -118,6 +118,7 @@
 #            -c           Clean as you go. Delete generated files as soon as they are not needed anymore.
 #            -dd          Disable automatic dependencies.
 #            -dm{module}  Check only automatic dependencies for this module.
+#            -hd          Disable precompiled headers.
 #            -mi          Let make handle creation of install directories. Rbuild will not generate the directories.
 #            -ps          Generate proxy makefiles in source tree instead of the output tree.
 #            -ud          Disable compilation units.

reactos/tools/rbuild/backend/mingw/mingw.cpp

@@ -1074,30 +1074,38 @@ MingwBackend::DetectPCHSupport ()
 {
 	printf ( "Detecting compiler pre-compiled header support..." );
 
-	string path = "tools" + sSep + "rbuild" + sSep + "backend" + sSep + "mingw" + sSep + "pch_detection.h";
-	string cmd = ssprintf (
-		"%s -c %s 1>%s 2>%s",
-		FixSeparatorForSystemCommand(compilerCommand).c_str (),
-		path.c_str (),
-		NUL,
-		NUL );
-	system ( cmd.c_str () );
-	path += ".gch";
-
-	FILE* f = fopen ( path.c_str (), "rb" );
-	if ( f )
+	if ( configuration.PrecompiledHeadersEnabled )
 	{
-		use_pch = true;
-		fclose ( f );
-		unlink ( path.c_str () );
+		string path = "tools" + sSep + "rbuild" + sSep + "backend" + sSep + "mingw" + sSep + "pch_detection.h";
+		string cmd = ssprintf (
+			"%s -c %s 1>%s 2>%s",
+			FixSeparatorForSystemCommand(compilerCommand).c_str (),
+			path.c_str (),
+			NUL,
+			NUL );
+		system ( cmd.c_str () );
+		path += ".gch";
+	
+		FILE* f = fopen ( path.c_str (), "rb" );
+		if ( f )
+		{
+			use_pch = true;
+			fclose ( f );
+			unlink ( path.c_str () );
+		}
+		else
+			use_pch = false;
+
+		if ( use_pch )
+			printf ( "detected\n" );
+		else
+			printf ( "not detected\n" );
 	}
 	else
+	{
 		use_pch = false;
-
-	if ( use_pch )
-		printf ( "detected\n" );
-	else
-		printf ( "not detected\n" );
+		printf ( "disabled\n" );
+	}
 }
 
 void

reactos/tools/rbuild/configuration.cpp

@@ -27,6 +27,7 @@ Configuration::Configuration ()
 	AutomaticDependencies = true;
 	CheckDependenciesForModuleOnly = false;
 	CompilationUnitsEnabled = true;
+	PrecompiledHeadersEnabled = true;
 	MakeHandlesInstallDirectories = false;
 	GenerateProxyMakefilesInSourceTree = false;
 	InstallFiles = false;

reactos/tools/rbuild/rbuild.cpp

@@ -82,6 +82,24 @@ ParseCompilationUnitSwitch (
 	return true;
 }
 
+bool
+ParsePrecompiledHeaderSwitch (
+	char switchChar2,
+	char* switchStart )
+{
+	switch ( switchChar2 )
+	{
+		case 'd':
+			configuration.PrecompiledHeadersEnabled = false;
+			break;
+		default:
+			printf ( "Unknown switch -h%c\n",
+			         switchChar2 );
+			return false;
+	}
+	return true;
+}
+
 bool
 ParseVCProjectSwitch (
 	char switchChar2,
@@ -214,6 +232,11 @@ ParseSwitch ( int argc, char** argv, int index )
 			return ParseAutomaticDependencySwitch (
 				switchChar2,
 				argv[index] );
+		case 'h':
+			return ParsePrecompiledHeaderSwitch (
+				switchChar2,
+				argv[index] );
+
 		case 'u':
 			return ParseCompilationUnitSwitch (
 				switchChar2,

reactos/tools/rbuild/rbuild.h

@@ -160,6 +160,7 @@ public:
 	bool AutomaticDependencies;
 	bool CheckDependenciesForModuleOnly;
 	bool CompilationUnitsEnabled;
+	bool PrecompiledHeadersEnabled;
 	std::string CheckDependenciesForModuleOnlyModule;
 	std::string VSProjectVersion;
 	std::string VSConfigurationType;