PR c++/70513

	* parser.c (cp_parser_enum_specifier): Check and possibly error for
	extra qualification.

	* g++.dg/cpp0x/forw_enum12.C: New test.
	* g++.dg/cpp0x/forw_enum13.C: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@235347 138bc75d-0d04-0410-961f-82ee72b054a4

5 files changed, 98 insertions, 0 deletions

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 50f3cc3bfd9..8efaa80b344 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2016-04-21  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/70513
+	* parser.c (cp_parser_enum_specifier): Check and possibly error for
+	extra qualification.
+
 2016-04-20  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/55635
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 0a1ed1a9710..feb8de76bc3 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -17233,6 +17233,16 @@ cp_parser_enum_specifier (cp_parser* parser)
 			  type, prev_scope, nested_name_specifier);
 	      type = error_mark_node;
 	    }
+	  /* If that scope is the scope where the declaration is being placed
+	     the program is invalid.  */
+	  else if (CLASS_TYPE_P (nested_name_specifier)
+		   && CLASS_TYPE_P (prev_scope)
+		   && same_type_p (nested_name_specifier, prev_scope))
+	    {
+	      permerror (type_start_token->location,
+			 "extra qualification not allowed");
+	      nested_name_specifier = NULL_TREE;
+	    }
 	}
 
       if (scoped_enum_p)
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c881c000dcf..52257e5bd8a 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2016-04-21  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/70513
+	* g++.dg/cpp0x/forw_enum12.C: New test.
+	* g++.dg/cpp0x/forw_enum13.C: New test.
+
 2016-04-21  Kirill Yukhin  <kirill.yukhin@intel.com>
 
 	PR target/70728
diff --git a/gcc/testsuite/g++.dg/cpp0x/forw_enum12.C b/gcc/testsuite/g++.dg/cpp0x/forw_enum12.C
new file mode 100644
index 00000000000..906ba68e062
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/forw_enum12.C
@@ -0,0 +1,29 @@
+// PR c++/70513
+// { dg-do compile { target c++11 } }
+
+struct S1
+{
+  enum E : int;
+  enum S1::E : int { X } e; // { dg-error "extra qualification not allowed" }
+};
+
+struct S2
+{
+  enum class E : int;
+  enum class S2::E : int { X } e; // { dg-error "extra qualification not allowed" }
+};
+
+struct S3
+{
+  enum struct E : int;
+  enum struct S3::E : int { X } e; // { dg-error "extra qualification not allowed" }
+};
+
+struct S4
+{
+  struct S5
+  {
+    enum E : char;
+    enum S4::S5::E : char { X } e; // { dg-error "extra qualification not allowed" }
+  };
+};
diff --git a/gcc/testsuite/g++.dg/cpp0x/forw_enum13.C b/gcc/testsuite/g++.dg/cpp0x/forw_enum13.C
new file mode 100644
index 00000000000..b8027f0c28d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/forw_enum13.C
@@ -0,0 +1,47 @@
+// PR c++/70513
+// { dg-do compile { target c++11 } }
+
+template <typename T>
+class D1
+{
+  enum A : int;
+  enum D1::A : int { foo } c; // { dg-error "extra qualification not allowed" }
+};
+
+template <typename T>
+class D2
+{
+  enum A : int;
+  enum D2<T>::A : int { foo } c; // { dg-error "extra qualification not allowed" }
+};
+
+template <typename T>
+class D3
+{
+  enum D3::A { foo } c; // { dg-error "extra qualification not allowed" }
+};
+
+template <typename T>
+class D4
+{
+  enum D4<T>::A { foo } c; // { dg-error "extra qualification not allowed" }
+};
+
+template <typename T>
+class D5
+{
+  class D6
+  {
+    enum D6::A { foo } c; // { dg-error "extra qualification not allowed" }
+  };
+};
+
+template <typename T>
+class D7
+{
+  class D8
+  {
+    enum A : int;
+    enum D8::A : int { foo } c; // { dg-error "extra qualification not allowed" }
+  };
+};