- add option to macro to specify for which backend this macro is intended

If the macro is for all backends, then you dont need to set this option
However, if this macro is for gcc only then put an option, i.e.:
<define name="__USE_W32API" backend="mingw" />

for msvc backend set backend="msvc"
-Currently filtering is only implemented for msvc backend

svn path=/trunk/; revision=27303

reactos/tools/rbuild/backend/msvc/vcprojmaker.cpp

@@ -195,6 +195,9 @@ MSVCBackend::_generate_vcproj ( const Module& module )
 		const vector<Define*>& defs = data.defines;
 		for ( i = 0; i < defs.size(); i++ )
 		{
+			if ( defs[i]->backend != "" && defs[i]->backend != "msvc" )
+				continue;
+
 			if ( defs[i]->value[0] )
 				common_defines.insert( defs[i]->name + "=" + defs[i]->value );
 			else

reactos/tools/rbuild/define.cpp

@@ -44,13 +44,15 @@ Define::Define ( const Project& project,
 
 Define::Define ( const Project& project,
 	             const Module* module,
-	             const std::string name_ )
+	             const std::string name_,
+	             const std::string backend_)
 	: project(project),
 	  module(module),
 	  node(NULL)
 {
 	name = name_;
 	value = "";
+    backend = backend_;
 }
 
 Define::~Define ()
@@ -62,9 +64,11 @@ Define::Initialize()
 {
 	const XMLAttribute* att = node->GetAttribute ( "name", true );
 	const XMLAttribute* empty = node->GetAttribute ( "empty", false );
+    const XMLAttribute* bck = node->GetAttribute ( "backend", false );
 	assert(att);
 	name = att->value;
-	value = node->value;
+    value = node->value;
+    if ( bck ) backend = bck->value;
 	if( empty ) value = " ";
 }
 

reactos/tools/rbuild/rbuild.h

@@ -390,6 +390,7 @@ public:
     const XMLElement* node;
 	std::string name;
 	std::string value;
+    std::string backend;
 
 	Define ( const Project& project,
 	         const XMLElement& defineNode );
@@ -398,7 +399,8 @@ public:
 	         const XMLElement& defineNode );
 	Define ( const Project& project,
 	         const Module* module,
-	         const std::string name_ );
+	         const std::string name_,
+	         const std::string backend_ = "" );
 	~Define();
 	void ProcessXML();
 private: