re PR c/69796 (ICE on invalid code in useless_type_conversion_p, at gimple-expr.c:83)

	PR c/69796
	PR c/69974
	* c-parser.c (c_parser_translation_unit): Don't change TREE_TYPE
	of incomplete decls to error_mark_node.

	* gcc.dg/pr69796.c: New test.
	* gcc.dg/pr69974.c: New test.

From-SVN: r233861

gcc/c/ChangeLog

+2016-03-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/69796
+	PR c/69974
+	* c-parser.c (c_parser_translation_unit): Don't change TREE_TYPE
+	of incomplete decls to error_mark_node.
+
 2016-02-24  Marek Polacek  <polacek@redhat.com>
 
 	PR c/69819

gcc/c/c-parser.c

@@ -1436,10 +1436,7 @@ c_parser_translation_unit (c_parser *parser)
   tree decl;
   FOR_EACH_VEC_ELT (incomplete_record_decls, i, decl)
     if (DECL_SIZE (decl) == NULL_TREE && TREE_TYPE (decl) != error_mark_node)
-      {
-	error ("storage size of %q+D isn%'t known", decl);
-	TREE_TYPE (decl) = error_mark_node;
-      }
+      error ("storage size of %q+D isn%'t known", decl);
 }
 
 /* Parse an external declaration (C90 6.7, C99 6.9).

gcc/testsuite/ChangeLog

+2016-03-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/69796
+	PR c/69974
+	* gcc.dg/pr69796.c: New test.
+	* gcc.dg/pr69974.c: New test.
+
 2016-03-01  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/stack_usage3.adb: Robustify and enable for all targets.

gcc/testsuite/gcc.dg/pr69796.c

+/* PR c/69796 */
+/* { dg-do compile } */
+
+struct S s;	/* { dg-error "storage size of 's' isn't known" } */
+
+void
+foo ()
+{
+  s a;	/* { dg-error "expression statement has incomplete type|expected" } */
+}

gcc/testsuite/gcc.dg/pr69974.c

+/* PR c/69974 */
+/* { dg-do compile } */
+
+struct S;
+char foo (struct S *);
+struct S a;	/* { dg-error "storage size of 'a' isn't known" } */
+int b;
+
+void
+bar ()
+{
+  b &= foo (&a);
+}