re PR c++/28387 (ICE with attribute on invalid declaration)

	PR c++/28387
	* decl2.c (cplus_decl_attributes): Check for invalid decls.

	* g++.dg/ext/attrib24.C: New test.

From-SVN: r115465

gcc/cp/ChangeLog

+2006-07-15  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	PR c++/28387
+	* decl2.c (cplus_decl_attributes): Check for invalid decls.
+
 2006-07-14  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
 	PR c++/28343

gcc/cp/decl2.c

@@ -997,7 +997,8 @@ grokbitfield (const cp_declarator *declarator,
 void
 cplus_decl_attributes (tree *decl, tree attributes, int flags)
 {
-  if (*decl == NULL_TREE || *decl == void_type_node)
+  if (*decl == NULL_TREE || *decl == void_type_node
+      || *decl == error_mark_node)
     return;
 
   if (TREE_CODE (*decl) == TEMPLATE_DECL)

gcc/testsuite/ChangeLog

+2006-07-15  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	PR c++/28387
+	* g++.dg/ext/attrib24.C: New test.
+
 2006-07-14  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
 	PR c++/28343

gcc/testsuite/g++.dg/ext/attrib24.C

+// PR c++/28387
+// { dg-do compile }
+
+enum __attribute__((unused)) E;  // { dg-error "without previous declaration" }