re PR c++/27951 (ICE with invalid anonymous union)

	PR c++/27951
	* decl2.c (finish_anon_union): Return early if build_anon_union_vars
	fails.

	* g++.dg/other/anon4.C: New test.

From-SVN: r114577

gcc/cp/ChangeLog

+2006-06-12  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	PR c++/27951
+	* decl2.c (finish_anon_union): Return early if build_anon_union_vars
+	fails.
+
 2006-06-12  Roger Sayle  <roger@eyesopen.com>
 
 	PR c++/21210

gcc/cp/decl2.c

@@ -1109,6 +1109,8 @@ finish_anon_union (tree anon_union_decl)
     }
 
   main_decl = build_anon_union_vars (type, anon_union_decl);
+  if (main_decl == error_mark_node)
+    return;
   if (main_decl == NULL_TREE)
     {
       warning (0, "anonymous union with no members");

gcc/testsuite/ChangeLog

+2006-06-12  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	PR c++/27951
+	* g++.dg/other/anon4.C: New test.
+
 2006-06-12  Roger Sayle  <roger@eyesopen.com>
 
 	PR c++/21210

gcc/testsuite/g++.dg/other/anon4.C

+// PR c++/27951
+// { dg-do compile }
+
+void foo()
+{
+    int i;             // { dg-error "previously" }
+    union { int i; };  // { dg-error "redeclaration" }
+}