re PR c++/17393 ("unused variable '._0'" warning with -Wall)

	PR c++/17393
	* decl.c (grokdeclarator): Robustify error-recovery on invalid
	declarations.

	PR c++/17393
	* g++.dg/parse/error21.C: New test.

From-SVN: r88855

gcc/cp/ChangeLog

+2004-10-10  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/17393
+	* decl.c (grokdeclarator): Robustify error-recovery on invalid
+	declarations.
+
 2004-10-10  Gabriel Dos Reis  <gdr@integrable-solutions.net>
 
 	Convert diagnostics to use quoting flag q 7/n

gcc/cp/decl.c

@@ -7765,7 +7765,7 @@ grokdeclarator (const cp_declarator *declarator,
 	   && ! bitfield)
     {
       error ("abstract declarator %qT used as declaration", type);
-      unqualified_id = make_anon_name ();
+      return error_mark_node;
     }
 
   /* Only functions may be declared using an operator-function-id.  */

gcc/testsuite/ChangeLog

+2004-10-10  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/17393
+	* g++.dg/parse/error21.C: New test.
+
 2004-10-10  Gabriel Dos Reis  <gdr@integrable-solutions.net>
 
 	* g++.dg/overload/pmf1.C: Adjust quoting marks.

gcc/testsuite/g++.dg/parse/error21.C

+// PR c++/17393
+// { dg-options "-Wall" }
+
+struct A { };
+
+void foo()
+{
+  // Check that we do not complain about an unused
+  // compiler-generated variable.
+  A& = a; // { dg-error "token|declarator|not declared" }
+}
+