Fix PR c/55570.

From-SVN: r194083

gcc/c-family/ChangeLog

+2012-12-03  Marek Polacek  <polacek@redhat.com>
+
+	PR c/55570
+	* c-common.c (check_user_alignment): Swap order of tests,
+	check TREE_CODE first.
+
 2012-11-29  Ed Smith-Rowland  <3dw4rd@verizon.net>
 
 	PR c++/52654

gcc/c-family/c-common.c

@@ -7261,8 +7261,8 @@ check_user_alignment (const_tree align, bool allow_zero)
 {
   int i;
 
-  if (!INTEGRAL_TYPE_P (TREE_TYPE (align))
-      || TREE_CODE (align) != INTEGER_CST)
+  if (TREE_CODE (align) != INTEGER_CST
+      || !INTEGRAL_TYPE_P (TREE_TYPE (align)))
     {
       error ("requested alignment is not an integer constant");
       return -1;

gcc/testsuite/ChangeLog

+2012-12-03  Marek Polacek  <polacek@redhat.com>
+
+	PR c/55570
+	* gcc.dg/pr55570.c: New test.
+
 2012-12-03  Jakub Jelinek  <jakub@redhat.com>
 
 	* lib/asan-dg.exp (asan_get_gtest_test_list,

gcc/testsuite/gcc.dg/pr55570.c

+/* PR c/55570 */
+/* { dg-do compile } */
+
+char array[16] __attribute__((aligned (SOME_NOT_DEFINED_MACRO))); /* { dg-error "requested alignment is not an integer constant" } */