Re: RFA: Use .opt files for the m68k port

[Richard Sandiford <rsandifo at redhat dot com>]

Gunther Nikl <gni@gecko.de> writes:
>   But I have question to the new option handling. In this message
>
>       http://gcc.gnu.org/ml/gcc-patches/2004-06/msg02053.html
>
>   you can find a proposal for a target option -mregparm for m68k. Its an
>   option *and* a switch. Is that still possible? Having it an option and
>   switch had problems with the option before the no- switch. since the
>   option was handled after the switch.

Yes, this should work.  You should also be able to avoid the
problem you mention.

First initialise m68k_regparm like this:

    int m68k_regparm = M68K_DEFAULT_REGPARM;

then add two target option entries like this:

    mregparm
    Target Mask(REGPARM)
    Help string...

    mregparm=
    Target RejectNegative Joined UInteger
    Help string...

and then add something like this to handle_option:

    case OPT_mregparm_:
      target_flags |= MASK_REGPARM;
      if (value < 1 || value > M68K_MAX_REGPARM)
        error ("-mregparm=%d is not between 1 and %d",
               value, M68K_MAX_REGPARM);
      else
        m68k_regparm = value;
      return true;

(All untested of course. ;)  There shouldn't be any need for code
in OVERRIDE_OPTIONS.

Richard