[MS ABI] Number unnamed TagDecls which aren't externally visible

TagDecls (structs, enums, etc.) may have the same name for linkage
purposes of one another; to disambiguate, we add a number to the mangled
named.  However, we didn't do this if the TagDecl has a pseudo-name for
linkage purposes (it was defined alongside a DeclaratorDecl or a
TypeNameDecl).

This fixes PR24651.

llvm-svn: 246659

1 files changed, 16 insertions, 0 deletions

diff --git a/clang/test/CodeGenCXX/mangle-ms-cxx11.cpp b/clang/test/CodeGenCXX/mangle-ms-cxx11.cpp
index 7cb09704de0..0a4c602df62 100644
--- a/clang/test/CodeGenCXX/mangle-ms-cxx11.cpp
+++ b/clang/test/CodeGenCXX/mangle-ms-cxx11.cpp
@@ -261,3 +261,19 @@ struct B {
 void f(decltype(B<int>::e)) {}
 // CHECK-DAG: @"\01?f@UnnamedType@@YAXPAW4<unnamed-type-e>@?$B@H@1@@Z
 }
+
+namespace PR24651 {
+template <typename T>
+void f(T) {}
+
+void g() {
+  enum {} E;
+  f(E);
+  {
+    enum {} E;
+    f(E);
+  }
+}
+// CHECK-DAG: @"\01??$f@W4<unnamed-type-E>@?1??g@PR24651@@YAXXZ@@PR24651@@YAXW4<unnamed-type-E>@?1??g@0@YAXXZ@@Z"
+// CHECK-DAG: @"\01??$f@W4<unnamed-type-E>@?2??g@PR24651@@YAXXZ@@PR24651@@YAXW4<unnamed-type-E>@?2??g@0@YAXXZ@@Z"
+}