Handle unscoped enumeration in nested name specifier.

If an unscoped enum is used as a nested name specifier and the language dialect
is not C++ 11, issue an extension warning.
This fixes PR16951.

Differential Revision: http://reviews.llvm.org/D6389

llvm-svn: 226413

1 files changed, 27 insertions, 2 deletions

diff --git a/clang/test/SemaCXX/nested-name-spec.cpp b/clang/test/SemaCXX/nested-name-spec.cpp
index 15d63e10a91..0fbdedc70a6 100644
--- a/clang/test/SemaCXX/nested-name-spec.cpp
+++ b/clang/test/SemaCXX/nested-name-spec.cpp
@@ -115,8 +115,8 @@ namespace E {
       X = 0
     };
 
-    void f() {
-      return E::X; // expected-error{{'E::Nested::E' is not a class, namespace, or enumeration}}
+    int f() {
+      return E::X; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}}
     }
   }
 }
@@ -410,3 +410,28 @@ struct S7c {
 };
 
 }
+
+namespace PR16951 {
+  namespace ns {
+    enum an_enumeration {
+      ENUMERATOR  // expected-note{{'ENUMERATOR' declared here}}
+    };
+  }
+
+  int x1 = ns::an_enumeration::ENUMERATOR; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}}
+
+  int x2 = ns::an_enumeration::ENUMERATOR::vvv; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}} \
+                                                // expected-error{{'ENUMERATOR' is not a class, namespace, or enumeration}} \
+
+  int x3 = ns::an_enumeration::X; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}} \
+                                  // expected-error{{no member named 'X'}}
+
+  enum enumerator_2 {
+    ENUMERATOR_2
+  };
+
+  int x4 = enumerator_2::ENUMERATOR_2; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}}
+  int x5 = enumerator_2::X2; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}} \
+                             // expected-error{{no member named 'X2' in 'PR16951::enumerator_2'}}
+
+}