re PR middle-end/77475 (unnecessary or misleading context in reporting command line problems)

	PR middle-end/77475
	* toplev.c (process_options): Temporarily set input_location
	to UNKNOWN_LOCATION around targetm.target_option.override () call.

From-SVN: r239994

gcc/ChangeLog

+2016-09-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/77475
+	* toplev.c (process_options): Temporarily set input_location
+	to UNKNOWN_LOCATION around targetm.target_option.override () call.
+
 2016-09-05  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR rtl-optimization/77452

gcc/toplev.c

@@ -1220,7 +1220,10 @@ process_options (void)
   no_backend = lang_hooks.post_options (&main_input_filename);
 
   /* Some machines may reject certain combinations of options.  */
+  location_t saved_location = input_location;
+  input_location = UNKNOWN_LOCATION;
   targetm.target_option.override ();
+  input_location = saved_location;
 
   if (flag_diagnostics_generate_patch)
       global_dc->edit_context_ptr = new edit_context ();