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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
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Date: Fri, 14 Oct 2022 18:31:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107266

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 Tobias Burnus from comment #1)
> Better example:
>=20
> character(kind=3D4) function f(x) bind(C)
>   character(kind=3D4), value :: x
> end
>=20
>=20
> Has the dump:
>=20
> __attribute__((fn spec (". w ")))
> character(kind=3D1) f (character(kind=3D1) x)
> {
>   (void) 0;
> }
>=20
>=20
> Note the change to kind=3D1

So, you want gfortran to reject the function.

It gets real ugly with

function f(x) bind(C) result(a)
   character(kind=3D4) a
   character(kind=3D4), value :: x
   a =3D x
end

leading to

__attribute__((fn spec (". w ")))
character(kind=3D1) f (character(kind=3D1) x)
{
  character(kind=3D1) a;

  *(character(kind=3D4) *) &a =3D *(character(kind=3D4) *) &x;
  return a;
}=