Choose a SourceLocation closer to which header the declaration might …

…"belong" and check if it's part of a Clang module.

At least for the time being since Clang 3.6's Serialization/ doesn't always map correctly the files to decls. And currently it's even varying with how the header is included, for example with:

    #include <unistd.h>

getpagesize() is mapped by ASTReader to unistd.h, but with

    #include <OGRE/Ogre.h>

where there is another extern C {} enclosing the extern C {} of cdefs.h, Clang's ASTReader maps getpagesize() to cdefs.h.

This is obviously a bug and Clang 3.7 may improve things a bit, e.g:

llvm-mirror/clang@938847c

Modules may have to be disabled until then, now that loading the global namespace « _ » is possible (iirc).

dmd2/cpp/cpptypes.cpp

@@ -1625,7 +1625,8 @@ static clang::Module *GetClangModuleForDecl(const clang::Decl* D)
     if (!MMap)
         return nullptr;
 
-    auto DLoc = SrcMgr.getFileLoc(D->getLocation());
+    auto Loc = SrcMgr.getSpellingLoc(D->getLocStart());
+    auto DLoc = SrcMgr.getFileLoc(Loc);
     if (!DLoc.isFileID())
         return nullptr;