Support __builtin_ms_va_list.

Summary:
This change adds support for `__builtin_ms_va_list`, a GCC extension for
variadic `ms_abi` functions. The existing `__builtin_va_list` support is
inadequate for this because `va_list` is defined differently in the Win64
ABI vs. the System V/AMD64 ABI.

Depends on D1622.

Reviewers: rsmith, rnk, rjmccall

CC: cfe-commits

Differential Revision: http://reviews.llvm.org/D1623

llvm-svn: 247941

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Sema/Sema.cpp b/clang/lib/Sema/Sema.cpp
index b009123c8c7..cc509566bdd 100644
--- a/clang/lib/Sema/Sema.cpp
+++ b/clang/lib/Sema/Sema.cpp
@@ -249,6 +249,12 @@ void Sema::Initialize() {
     }
   }
 
+  if (PP.getTargetInfo().hasBuiltinMSVaList()) {
+    DeclarationName MSVaList = &Context.Idents.get("__builtin_ms_va_list");
+    if (IdResolver.begin(MSVaList) == IdResolver.end())
+      PushOnScopeChains(Context.getBuiltinMSVaListDecl(), TUScope);
+  }
+
   DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
   if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
     PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);