[Bug c/65403] -Wno-error=<not implemented> is an error

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65403

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-03-12
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
For fixing the output, the following should be enough:

Index: opts.c
===================================================================
--- opts.c      (revision 221118)
+++ opts.c      (working copy)
@@ -2341,11 +2341,12 @@ enable_warning_as_error (const char *arg
   new_option[0] = 'W';
   strcpy (new_option + 1, arg);
   option_index = find_opt (new_option, lang_mask);
   if (option_index == OPT_SPECIAL_unknown)
     {
-      error_at (loc, "-Werror=%s: no option -%s", arg, new_option);
+      error_at (loc, "-W%s=%s: no option -%s",
+               value ? "error" : "no-error", arg, new_option);
     }
   else
     {
       const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;