re PR sanitizer/88215 (UBSAN: Internal compiler error with attribute(unused))

	PR c++/88215
	* c-ubsan.c: Include langhooks.h.
	(ubsan_instrument_division): Change gcc_assert that main variants
	of op0 and op1 types are equal to gcc_checking_assert that the
	main variants are compatible types.

	* c-c++-common/ubsan/pr88215.c: New test.

From-SVN: r266546

gcc/c-family/ChangeLog

+2018-11-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/88215
+	* c-ubsan.c: Include langhooks.h.
+	(ubsan_instrument_division): Change gcc_assert that main variants
+	of op0 and op1 types are equal to gcc_checking_assert that the
+	main variants are compatible types.
+
 2018-11-27  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* c-ada-spec.c: Include stringpool.h.

gcc/c-family/c-ubsan.c

@@ -31,6 +31,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "stringpool.h"
 #include "attribs.h"
 #include "asan.h"
+#include "langhooks.h"
 
 /* Instrument division by zero and INT_MIN / -1.  If not instrumenting,
    return NULL_TREE.  */
@@ -44,8 +45,9 @@ ubsan_instrument_division (location_t loc, tree op0, tree op1)
   /* At this point both operands should have the same type,
      because they are already converted to RESULT_TYPE.
      Use TYPE_MAIN_VARIANT since typedefs can confuse us.  */
-  gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (op0))
-	      == TYPE_MAIN_VARIANT (TREE_TYPE (op1)));
+  tree top0 = TYPE_MAIN_VARIANT (type);
+  tree top1 = TYPE_MAIN_VARIANT (TREE_TYPE (op1));
+  gcc_checking_assert (lang_hooks.types_compatible_p (top0, top1));
 
   op0 = unshare_expr (op0);
   op1 = unshare_expr (op1);

gcc/testsuite/ChangeLog

+2018-11-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/88215
+	* c-c++-common/ubsan/pr88215.c: New test.
+
 2018-10-19  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/88182

gcc/testsuite/c-c++-common/ubsan/pr88215.c

+/* PR c++/88215 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=integer-divide-by-zero" } */
+
+int
+foo (void)
+{
+  int a = 2, __attribute__ ((__unused__)) b = 1;
+  int f = a / b;
+  return f;
+}