CXXMethodDecls should always be mangled, even if they are inside an extern "C" block. Fixes PR5017.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82567 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 14 insertions, 1 deletions

diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index 5a994d2234..878f13d516 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -131,7 +131,7 @@ bool CXXNameMangler::mangleFunctionDecl(const FunctionDecl *FD) {
       return false;
 
     // No name mangling in a C linkage specification.
-    if (isInCLinkageSpecification(FD))
+    if (!isa<CXXMethodDecl>(FD) && isInCLinkageSpecification(FD))
       return false;
   }
 
@@ -502,6 +502,9 @@ void CXXNameMangler::manglePrefix(const DeclContext *DC) {
   //           ::= <substitution>
   // FIXME: We only handle mangling of namespaces and classes at the moment.
 
+  while (isa<LinkageSpecDecl>(DC))
+    DC = DC->getParent();
+  
   if (DC->isTranslationUnit())
     return;
   
diff --git a/test/CodeGenCXX/mangle.cpp b/test/CodeGenCXX/mangle.cpp
index dbcd0c9460..306188c8de 100644
--- a/test/CodeGenCXX/mangle.cpp
+++ b/test/CodeGenCXX/mangle.cpp
@@ -137,3 +137,13 @@ extern "C" { struct a { int b; }; }
 int f(struct a *x) {
     return x->b;
 }
+
+// PR5017
+extern "C" {
+struct Debug {
+ const Debug& operator<< (unsigned a) const { }
+};
+Debug dbg;
+// CHECK: @_ZNK5DebuglsEj
+int main(void) {  dbg << 32 ;}
+}