re PR sanitizer/80067 (ICE in fold_comparison with -fsanitize=undefined)

	PR sanitizer/80067
	* fold-const.c (fold_comparison): Use protected_set_expr_location
	instead of SET_EXPR_LOCATION.

	* c-c++-common/ubsan/shift-10.c: New test.

From-SVN: r246521

gcc/ChangeLog

+2017-03-28  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/80067
+	* fold-const.c (fold_comparison): Use protected_set_expr_location
+	instead of SET_EXPR_LOCATION.
+
 2017-03-28  Markus Trippelsdorf  <markus@trippelsdorf.de>
 
 	* tree.c (add_expr): Avoid name lookup warning.

gcc/fold-const.c

@@ -8704,7 +8704,7 @@ fold_comparison (location_t loc, enum tree_code code, tree type,
 	      if (save_p)
 		{
 		  tem = save_expr (build2 (code, type, cval1, cval2));
-		  SET_EXPR_LOCATION (tem, loc);
+		  protected_set_expr_location (tem, loc);
 		  return tem;
 		}
 	      return fold_build2_loc (loc, code, type, cval1, cval2);

gcc/testsuite/ChangeLog

+2017-03-28  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/80067
+	* c-c++-common/ubsan/shift-10.c: New test.
+
 2017-03-27  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/80216

gcc/testsuite/c-c++-common/ubsan/shift-10.c

+/* PR sanitizer/80067 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=shift" } */
+
+extern signed char a;
+void
+foo ()
+{
+  0 << ((647 > a) - 1);
+}