Itanium ABI: Properly mangle extern "C" template arguments

extern "C" declarations should be considered like global declarations
for mangling purposes.

Differential Revision: http://reviews.llvm.org/D7718

llvm-svn: 229724

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index f56e242d374..b97a2e6d571 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -69,6 +69,14 @@ static const DeclContext *getEffectiveDeclContext(const Decl *D) {
   if (const CapturedDecl *CD = dyn_cast<CapturedDecl>(DC))
     return getEffectiveDeclContext(CD);
 
+  if (const auto *VD = dyn_cast<VarDecl>(D))
+    if (VD->isExternC())
+      return VD->getASTContext().getTranslationUnitDecl();
+
+  if (const auto *FD = dyn_cast<FunctionDecl>(D))
+    if (FD->isExternC())
+      return FD->getASTContext().getTranslationUnitDecl();
+
   return DC;
 }