method-serial.cc: Mark varible as potentially unused to silence warning.

       * method-serial.cc: Mark varible as potentially unused
        to silence warning.

From-SVN: r265627

libitm/ChangeLog

+2018-10-30  Nicholas Krause <xerofoify@gmail.com>
+
+	* method-serial.cc: Mark varible as potentially unused
+	to silence warning.
+
 2018-08-03  Sergei Trofimovich  <slyfox@gentoo.org>
 
 	* config/sh/sjlj.S: Adjust to use PIC vs normal code to avoid

libitm/method-serial.cc

@@ -306,7 +306,7 @@ GTM::gtm_thread::serialirr_mode ()
       // We're already serial, so we don't need to ensure privatization safety
       // for other transactions here.
       gtm_word priv_time = 0;
-      bool ok = disp->trycommit (priv_time);
+      bool ok __attribute__((unused)) = disp->trycommit (priv_time);
       // Given that we're already serial, the trycommit better work.
       assert (ok);
     }