Re: AmigaOS fork()

[Tim Van Holder]

> +/* On AmigaOS, fork() isn't implemented due to missing MP. */
> +int main ()
> +{
> +  if (fork() < 0)
> +    exit (1);
> +  exit (0);
> +}],
> +            [ac_cv_func_fork_works=yes],
> +            [ac_cv_func_fork_works=no],
> +            [AC_CHECK_FUNC(fork)
> +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [return __amigaos__;])],
> +                   [ac_cv_func_fork_works=no],
> +                   [ac_cv_func_fork_works=$ac_cv_func_fork])
There are some other systems were fork exists but is not implemented
(such as DJGPP).  So I'm not too happy about the hardcoded reference
to AmigaOS.
For the cross-compiling case, I think

        case "$host" in
          *-*-amigaos* | *-*-msdosdjgpp*)
            # Override, as these systems have only a dummy fork() stub
            ac_cv_func_fork_works=no
            ;;
        esac

will do just fine; no need to try a compile.
And I'd use

        /* Some systems only have a dummy stub for fork() */

or something similar.