From ea6cc726d11365a23ac85d1c3d5884809895843e Mon Sep 17 00:00:00 2001
From: David Majnemer <david.majnemer@gmail.com>
Date: Fri, 9 Jan 2015 06:10:21 +0000
Subject: [PATCH] Sema: Don't crash when specializing a global scope function
 in a class

We assumed that class-scope specializations would result in a
CXXMethodDecl for that class.  However, globally qualified functions
will result in normal FunctionDecls.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@225508 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaDecl.cpp                    | 2 +-
 test/SemaTemplate/instantiate-method.cpp | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 8a5047592a..1e20121b37 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -7482,7 +7482,7 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
     } else if (isFunctionTemplateSpecialization) {
       if (CurContext->isDependentContext() && CurContext->isRecord() 
           && !isFriend) {
-        isDependentClassScopeExplicitSpecialization = true;
+        isDependentClassScopeExplicitSpecialization = isa<CXXMethodDecl>(NewFD);
         Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 
           diag::ext_function_specialization_in_class :
           diag::err_function_specialization_in_class)
diff --git a/test/SemaTemplate/instantiate-method.cpp b/test/SemaTemplate/instantiate-method.cpp
index 4cc40af7e1..c2d4704bc0 100644
--- a/test/SemaTemplate/instantiate-method.cpp
+++ b/test/SemaTemplate/instantiate-method.cpp
@@ -195,3 +195,9 @@ namespace PR22040 {
     Foobar<int>::bazqux(3);  // expected-error{{no member named 'bazqux' in }}
   }
 }
+
+template <typename>
+struct SpecializationOfGlobalFnInClassScope {
+  template <>
+  void ::Fn(); // expected-error{{cannot have a qualified name}} expected-error{{cannot specialize a function}}
+};
-- 
2.50.1