re PR c/81231 (ICE with invalid argument to __atomic_*)

	PR c/81231
	* c-common.c (sync_resolve_size): Give error for pointers to incomplete
	types.

	* gcc.dg/atomic-pr81231.c: New test.

From-SVN: r249963

gcc/c-family/ChangeLog

 2017-07-04  Marek Polacek  <polacek@redhat.com>
 
+	PR c/81231
+	* c-common.c (sync_resolve_size): Give error for pointers to incomplete
+	types.
+
+2017-07-04  Marek Polacek  <polacek@redhat.com>
+
 	* c-warn.c (warn_if_unused_value): Remove WITH_CLEANUP_EXPR handling.
 
 2017-06-28  Martin Liska  <mliska@suse.cz>

gcc/c-family/c-common.c

@@ -6485,6 +6485,9 @@ sync_resolve_size (tree function, vec<tree, va_gc> *params, bool fetch)
   if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type))
     goto incompatible;
 
+  if (!COMPLETE_TYPE_P (type))
+    goto incompatible;
+
   if (fetch && TREE_CODE (type) == BOOLEAN_TYPE)
     goto incompatible;
 

gcc/testsuite/ChangeLog

+2017-07-04  Marek Polacek  <polacek@redhat.com>
+
+	PR c/81231
+	* gcc.dg/atomic-pr81231.c: New test.
+
 2017-07-04  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	PR tree-optimization/81292

gcc/testsuite/gcc.dg/atomic-pr81231.c

+/* PR c/81231 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+enum E;
+
+void
+foo (void)
+{
+  __atomic_load_n ((enum E *) 0, 0); /* { dg-error "incompatible" } */
+  __atomic_load_n ((enum X *) 0, 0); /* { dg-error "incompatible" } */
+}