selftest.h: mark failure functions with ATTRIBUTE_NORETURN.

gcc/ChangeLog:
	* selftest.h (selftest::fail): Add ATTRIBUTE_NORETURN.
	(selftest::fail_formatted): Likewise.

From-SVN: r239832

gcc/ChangeLog

 2016-08-29  David Malcolm  <dmalcolm@redhat.com>
 
+	* selftest.h (selftest::fail): Add ATTRIBUTE_NORETURN.
+	(selftest::fail_formatted): Likewise.
+
+2016-08-29  David Malcolm  <dmalcolm@redhat.com>
+
 	* input.c (make_location): Call get_start and get_finish
 	on the endpoints to avoid storing packed ranges or ad-hoc
 	ranges in them.

gcc/selftest.h

@@ -56,12 +56,13 @@ extern void pass (const location &loc, const char *msg);
 
 /* Report the failed outcome of some aspect of the test and abort.  */
 
-extern void fail (const location &loc, const char *msg);
+extern void fail (const location &loc, const char *msg)
+  ATTRIBUTE_NORETURN;
 
 /* As "fail", but using printf-style formatted output.  */
 
 extern void fail_formatted (const location &loc, const char *fmt, ...)
- ATTRIBUTE_PRINTF_2;
+  ATTRIBUTE_PRINTF_2 ATTRIBUTE_NORETURN;
 
 /* Implementation detail of ASSERT_STREQ.  */