re PR other/31566 (@missing_file gives bad error message)

       PR other/31566
        * gcc.c (process_command): For @filename handling, output
        the correct name if the file does not exist.

From-SVN: r240669

gcc/ChangeLog

+2016-09-30  Prasad Ghangal  <prasad.ghangal@gmail.com>
+
+	PR other/31566
+	* gcc.c (process_command): For @filename handling, output
+	the correct name if the file does not exist.
+
 2016-09-30  Marek Polacek  <polacek@redhat.com>
 
 	* config/aarch64/aarch64-simd.md: Adjust fall through comments.

gcc/gcc.c

@@ -4417,7 +4417,12 @@ process_command (unsigned int decoded_options_count,
 	    fname = xstrdup (arg);
 
           if (strcmp (fname, "-") != 0 && access (fname, F_OK) < 0)
-	    perror_with_name (fname);
+	    {
+	      if (fname[0] == '@' && access (fname + 1, F_OK) < 0)
+		perror_with_name (fname + 1);
+	      else
+		perror_with_name (fname);
+	    }
           else
 	    add_infile (arg, spec_lang);