Fix for ICE with -g on testcase with incomplete types.

gcc/c/
	PR debug/66068
	* c-typeck.c (c_build_qualified_type): Clear C_TYPE_INCOMPLETE_VARS
	after calling build_qualified_type.
gcc/testsuite/
	PR debug/66068
	* gcc.dg/debug/pr66068.c: New test.

From-SVN: r229505

gcc/c/ChangeLog

+2015-10-26  Jim Wilson  <jim.wilson@linaro.org>
+
+	PR debug/66068
+	* c-typeck.c (c_build_qualified_type): Clear C_TYPE_INCOMPLETE_VARS
+	after calling build_qualified_type.
+
 2015-10-27  Cesar Philippidis  <cesar@codesourcery.com>
 	    Thomas Schwinge  <thomas@codesourcery.com>
 	    James Norris  <jnorris@codesourcery.com>

gcc/c/c-typeck.c

@@ -13126,7 +13126,13 @@ c_build_qualified_type (tree type, int type_quals)
       type_quals &= ~TYPE_QUAL_RESTRICT;
     }
 
-  return build_qualified_type (type, type_quals);
+  tree var_type = build_qualified_type (type, type_quals);
+  /* A variant type does not inherit the list of incomplete vars from the
+     type main variant.  */
+  if (TREE_CODE (var_type) == RECORD_TYPE
+      || TREE_CODE (var_type) == UNION_TYPE)
+    C_TYPE_INCOMPLETE_VARS (var_type) = 0;
+  return var_type;
 }
 
 /* Build a VA_ARG_EXPR for the C parser.  */

gcc/testsuite/ChangeLog

+2015-10-26  Jim Wilson  <jim.wilson@linaro.org>
+
+	PR debug/66068
+	* gcc.dg/debug/pr66068.c: New test.
+
 2015-01-28  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/67933

gcc/testsuite/gcc.dg/debug/pr66068.c

+/* { dg-do compile } */
+
+struct S a;
+const struct S b;
+struct S
+{
+};
+
+union U c;
+const union U d;
+union U
+{
+};