1 files changed, 8 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 9bba5f6c78d..20fb7a768be 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -974,6 +974,14 @@ static bool canBeOverloaded(const FunctionDecl &D) {
   if (D.isMain())
     return false;
 
+  // FIXME: Users assume they know the mangling of static functions
+  // declared in extern "C" contexts. For now just disallow overloading these
+  // functions so that we can avoid mangling them.
+  const DeclContext *DC = D.getDeclContext();
+  if (!DC->isRecord() &&
+      D.getFirstDeclaration()->getDeclContext()->isExternCContext())
+    return false;
+
   return true;
 }