re PR c++/6477 (Segfault on conflicting types in trivial code)

	PR c++/6477
	* decl.c (follow_tag_typedef): Check if TYPE_NAME (original) is
	non-NULL first.

	* g++.dg/parse/typedef1.C: New test.

From-SVN: r52900

gcc/cp/ChangeLog

+2002-04-29  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/6477
+	* decl.c (follow_tag_typedef): Check if TYPE_NAME (original) is
+	non-NULL first.
+
 2002-04-29  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/6492

gcc/cp/decl.c

@@ -5332,6 +5332,8 @@ follow_tag_typedef (type)
   tree original;
 
   original = original_type (type);
+  if (! TYPE_NAME (original))
+    return NULL_TREE;
   if (TYPE_IDENTIFIER (original) == TYPE_IDENTIFIER (type)
       && (CP_DECL_CONTEXT (TYPE_NAME (original))
 	  == CP_DECL_CONTEXT (TYPE_NAME (type)))

gcc/testsuite/ChangeLog

+2002-04-29  Jakub Jelinek  <jakub@redhat.com>
+
+	* g++.dg/parse/typedef1.C: New test.
+
 2002-04-29  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/6486

gcc/testsuite/g++.dg/parse/typedef1.C

+// PR c++/6477
+typedef struct A_ *A;	// { dg-error "previous declaration as" }
+typedef struct A B;	// { dg-error "conflicting types" }