re PR c/63549 ([4.8/4.9/5] ICE in build_array_ref with invalid code)

	PR c/63549
	* c-typeck.c (build_array_ref): Bail if the index in an incomplete
	type.

	* gcc.dg/pr63549.c: New test.

From-SVN: r216413

gcc/c/ChangeLog

 2014-10-17  Marek Polacek  <polacek@redhat.com>
 
+	PR c/63549
+	* c-typeck.c (build_array_ref): Bail if the index in an incomplete
+	type.
+
+2014-10-17  Marek Polacek  <polacek@redhat.com>
+
 	* c-decl.c (grokdeclarator): Use OPT_Wimplicit_int unconditionally.
 	(start_function): Use OPT_Wimplicit_int instead of 0.
 	(store_parm_decls_oldstyle): Likewise.

gcc/c/c-typeck.c

@@ -2478,6 +2478,8 @@ build_array_ref (location_t loc, tree array, tree index)
 
   /* Apply default promotions *after* noticing character types.  */
   index = default_conversion (index);
+  if (index == error_mark_node)
+    return error_mark_node;
 
   gcc_assert (TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE);
 

gcc/testsuite/ChangeLog

 2014-10-17  Marek Polacek  <polacek@redhat.com>
 
+	PR c/63549
+	* gcc.dg/pr63549.c: New test.
+
+2014-10-17  Marek Polacek  <polacek@redhat.com>
+
 	* gcc.dg/Wimplicit-int-1.c: New test.
 	* gcc.dg/Wimplicit-int-2.c: New test.
 	* gcc.dg/Wimplicit-int-3.c: New test.

gcc/testsuite/gcc.dg/pr63549.c

+/* PR c/63549 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+enum E e;
+int a[10];
+int i = a[e]; /* { dg-error "has an incomplete type" } */