re PR c++/78637 (ICE on invalid C++ code on x86_64-linux-gnu (internal compiler…

re PR c++/78637 (ICE on invalid C++ code on x86_64-linux-gnu (internal compiler error: in pop_namespace, at cp/name-lookup.c:3826))

/cp
2016-12-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/78637
	* parser.c (cp_parser_namespace_definition): Increment
	nested_definition_count only if push_namespace succeeds.

/testsuite
2016-12-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/78637
	* g++.dg/parse/namespace14.C: New.

From-SVN: r243529

gcc/cp/ChangeLog

+2016-12-11  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/78637
+	* parser.c (cp_parser_namespace_definition): Increment
+	nested_definition_count only if push_namespace succeeds.
+
 2016-12-08  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/78551

gcc/cp/parser.c

@@ -18184,8 +18184,8 @@ cp_parser_namespace_definition (cp_parser* parser)
               cp_parser_error (parser, "nested identifier required");
               break;
             }
-          ++nested_definition_count;
-          push_namespace (identifier);
+	  if (push_namespace (identifier))
+	    ++nested_definition_count;
         }
     }
 

gcc/testsuite/ChangeLog

+2016-12-11  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/78637
+	* g++.dg/parse/namespace14.C: New.
+
 2016-12-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/78720

gcc/testsuite/g++.dg/parse/namespace14.C

+// PR c++/78637
+
+namespace X {
+class Y;
+}
+namespace X::Y z;  // { dg-error "namespace|expected|type" }