extern variable declared locally to objective-c++ method

should not be mangled either. Fixes radar 8016412.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107303 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/Mangle.cpp

@@ -294,7 +294,7 @@ bool MangleContext::shouldMangleDeclName(const NamedDecl *D) {
   if (!FD) {
     const DeclContext *DC = D->getDeclContext();
     // Check for extern variable declared locally.
-    if (isa<FunctionDecl>(DC) && D->hasLinkage())
+    if ((isa<FunctionDecl>(DC) || isa<ObjCMethodDecl>(DC) ) && D->hasLinkage())
       while (!DC->isNamespace() && !DC->isTranslationUnit())
         DC = DC->getParent();
     if (DC->isTranslationUnit() && D->getLinkage() != InternalLinkage)

test/CodeGenObjCXX/method-local-extern-mangle.mm

@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
+
+// CHECK: @gGlobals = external global
+
+@interface I
+- (int) Meth;
+@end
+
+@implementation I
+- (int) Meth {
+    extern int gGlobals;
+    return gGlobals;
+}
+@end