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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libfortran/102992] fortran: redirecting standard out to a file
 does not work on macOS 12.0
Date: Fri, 12 Nov 2021 12:31:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102992

--- Comment #29 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Francois-Xavier Coudert from comment #28)
> > Well, unless there's a good reason to have it in a DTOR, it makes for a=
 more
> > robust solution to call it directly (there are various other differences
> > that could occur in mixed code bases esp. c++ + fortran even without the
> > Darwin21.1 bug).
>=20
> Mixed code is in fact the reason why it's in a DTOR and not called at the
> end of Fortran main program. We need this clean-up routine to run even wh=
en
> the main code is not in Fortran, and but Fortran routines are called by
> other means (Fortran object files linked, or Fortran-based library loaded=
 at
> run-time).

I've posted a fix for this (it is the fix for darwin21 DTORs in general)
however CAVEAT : there is No guarantee given by the GCC DTOR machinery about
the relative ordering of DTORs between different TUs, my fix will not solve
that.=