[Bug libfortran/66936] io/unix.c gratuitously uses S_IRWXG and S_IRWXO on the basis that mkstemp() is available

["keith.marshall at mailinator dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66936

--- Comment #2 from Keith Marshall <keith.marshall at mailinator dot com> ---
(In reply to kargl from comment #1)
> The name of the language is Fortran.  The language has been called
> Fortran since 1988 or so.

It was always FORTRAN, in the days when I actually used the language, but how
you choose to capitalize it, or not, is completely irrelevant.

> The correct fix would be to add test to configure to define
> HAVE_S_IRWXG and HAVE_S_IRWXO.

Of course it would, but I'm not going to dirty my hands with your autoconf
code; this is your bug, and that is definitively your responsibility.

> A better fix would be for MingW32 to conform to POSIX.

No, it most definitely would not; that is never going to happen.  MinGW is
definitively aimed at Microsoft Windows compatibility.  Windows is not POSIX,
and nor is MinGW; nor will it ever be, nor will it even aspire to be.  S_IRWXG
and S_IRWXO have no place in the windows environment; it would be wrong for
MinGW to define them, (even if an appropriate pseudo-definition were ever
proposed), just as it is wrong for you to assume that availability of mkstemp()
implies that they should be defined.