PR c++/51477 - ICE with invalid NSDMI

gcc/cp/

	PR c++/51477
	* search.c (lookup_member): Get out early on invalid base type.

gcc/testsuite/

	PR c++/51477
	* g++.dg/cpp0x/nsdmi6.C: New test.

From-SVN: r182474

gcc/cp/ChangeLog

+2011-12-19  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/51477
+	* search.c (lookup_member): Get out early on invalid base type.
+
 2011-12-19  Jason Merrill  <jason@redhat.com>
 
 	PR c++/51489

gcc/cp/search.c

@@ -1171,7 +1171,9 @@ lookup_member (tree xbasetype, tree name, int protect, bool want_type,
 
   const char *errstr = 0;
 
-  if (name == error_mark_node)
+  if (name == error_mark_node
+      || xbasetype == NULL_TREE
+      || xbasetype == error_mark_node)
     return NULL_TREE;
 
   gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);

gcc/testsuite/ChangeLog

+2011-12-19  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/51477
+	* g++.dg/cpp0x/nsdmi6.C: New test.
+
 2011-12-19  Tobias Burnus  <burnus@net-b.de>
 
 	* gfortran.dg/coarray_poly_3.f90: New.

gcc/testsuite/g++.dg/cpp0x/nsdmi6.C

+// Origin PR c++/51477
+// { dg-options "-std=c++11" }
+
+struct A
+{
+    typedef int int T; // { dg-error "two or more data types in declaration" }
+    struct T x[1] = { 0 }; // { dg-error "invalid|forward" }
+};