Revert r160404, "Eliminating the GCC_CAST hack, take two.", for now.

It crashes mingw32-gcc-4.4.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160486 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/AST/RecursiveASTVisitor.h b/include/clang/AST/RecursiveASTVisitor.h
index b30b178807eb632a65816a74b37021e5a2d0851f..2e56a486f3d0bb2432b21fa04ddb5296d54a12cc 100644 (file)
--- a/include/clang/AST/RecursiveASTVisitor.h
+++ b/include/clang/AST/RecursiveASTVisitor.h
@@ -464,12 +464,19 @@ template<typename Derived>
 bool RecursiveASTVisitor<Derived>::dataTraverseNode(Stmt *S,
                                                     bool &EnqueueChildren) {
 
+// The cast for DISPATCH_WALK is needed for older versions of g++, but causes
+// problems for MSVC.  So we'll skip the cast entirely for MSVC.
+#if defined(_MSC_VER)
+  #define GCC_CAST(CLASS)
+#else
+  #define GCC_CAST(CLASS) (bool (RecursiveASTVisitor::*)(CLASS*))
+#endif
+
   // Dispatch to the corresponding WalkUpFrom* function only if the derived
   // class didn't override Traverse* (and thus the traversal is trivial).
 #define DISPATCH_WALK(NAME, CLASS, VAR) \
-  if (bool (Derived::*DerivedFn)(CLASS*) = &Derived::Traverse##NAME) \
-    if (bool (Derived::*BaseFn)(CLASS*) = &RecursiveASTVisitor::Traverse##NAME)\
-      if (DerivedFn == BaseFn) \
+  if (&RecursiveASTVisitor::Traverse##NAME == \
+      GCC_CAST(CLASS)&Derived::Traverse##NAME) \
     return getDerived().WalkUpFrom##NAME(static_cast<CLASS*>(VAR)); \
   EnqueueChildren = false; \
   return getDerived().Traverse##NAME(static_cast<CLASS*>(VAR));
@@ -509,6 +516,7 @@ bool RecursiveASTVisitor<Derived>::dataTraverseNode(Stmt *S,
   }
 
 #undef DISPATCH_WALK
+#undef GCC_CAST
 
   return true;
 }