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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/107441] optional arguments are identified as "present"
 when missing
Date: Thu, 27 Oct 2022 18:52:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107441

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu.org

--- Comment #2 from kargl at gcc dot gnu.org ---
(In reply to anlauf from comment #1)
> Confirmed.
>=20
> There is an inconsistency either in the generated code for the caller or
> the callee:
>=20
> integer(kind=3D4) testoptional (character(kind=3D1)[1:1] & restrict w,
> integer(kind=3D4) x, integer(kind=3D8) _w, logical(kind=3D1) _x)
>=20
> vs.
>=20
>   t =3D testoptional (&s, 0, 0, 1);
>=20
> How does the ABI define the ordering of character length and presence fla=
g?

Yep, there's an API issue.  If you use

   character(len=3D13) :: s

the produced code is

     t =3D testoptional (&s, 0, 0, 13);

so the hidden charlen is tacked on last whereas I think the hidden presence
argument is also expected to be last.  Likely a counting error in generating
the interface.=