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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/66973] Incorrect resolution of generic interface with
 TYPE(C_PTR)
Date: Wed, 12 Apr 2023 19:42:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D66973

--- Comment #8 from anlauf at gcc dot gnu.org ---
(In reply to anlauf from comment #7)
> The behavior also depends on the order of USE statements in the main:
>=20
>   USE H5T
>   USE ISO_C_BINDING
>=20
> differs from
>=20
>   USE ISO_C_BINDING
>   USE H5T
>=20
> which should not happen...

A workaround is to use a temporary of type(c_ptr) for the actual argument:

  type(c_ptr) :: ptr
  CALL pickone(ptr)

This works for me.

Possibly the issue is with the resolution of (the type of?) C_LOC ...=