Builtin types are subsitutable if they are qualified. Fixes PR5196.

llvm-svn: 84237

clang/lib/CodeGen/Mangle.cpp

@@ -705,7 +705,7 @@ void CXXNameMangler::mangleType(QualType T) {
   // Only operate on the canonical type!
   T = Context.getASTContext().getCanonicalType(T);
 
-  bool IsSubstitutable = !isa<BuiltinType>(T);
+  bool IsSubstitutable = T.hasQualifiers() || !isa<BuiltinType>(T);
   if (IsSubstitutable && mangleSubstitution(T))
     return;
 

clang/test/CodeGenCXX/mangle-subst.cpp

@@ -54,3 +54,8 @@ template<typename T> void ft3(S1<T>, S1<char>) {  }
 // CHECK: @_ZN2NS3ft3IiEEvNS_2S1IT_EENS1_IcEE
 template void ft3<int>(S1<int>, S1<char>);
 }
+
+// PR5196
+// CHECK: @_Z1fPKcS0_
+void f(const char*, const char*) {}
+