Correctly compute linkage of decls forward declared extern C.

This fixes a crash in

namespace {
  struct X {};
}
extern "C" X test2_b;
X test2_b

before we would assign different linkages to each of the test2_b decls.

llvm-svn: 176869

1 files changed, 1 insertions, 2 deletions

diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index c2168a2102a..9ee70e25108 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -620,8 +620,7 @@ static LinkageInfo getLVForNamespaceScopeDecl(const NamedDecl *D,
     //
     // Note that we don't want to make the variable non-external
     // because of this, but unique-external linkage suits us.
-    if (Context.getLangOpts().CPlusPlus &&
-        !Var->getDeclContext()->isExternCContext()) {
+    if (Context.getLangOpts().CPlusPlus && !isInExternCContext(Var)) {
       LinkageInfo TypeLV = Var->getType()->getLinkageAndVisibility();
       if (TypeLV.getLinkage() != ExternalLinkage)
         return LinkageInfo::uniqueExternal();