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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libfortran/108056] [12 Regression] backward compatibility issue
 between 11 and 12
Date: Wed, 21 Dec 2022 07:23:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108056

--- Comment #20 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Tobias Burnus
<burnus@gcc.gnu.org>:

https://gcc.gnu.org/g:ed3e8a988e0ec5b926093e26dfeef1d8b7504d1f

commit r12-9003-ged3e8a988e0ec5b926093e26dfeef1d8b7504d1f
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Wed Dec 21 07:55:22 2022 +0100

    libgfortran's ISO_Fortran_binding.c: Use GCC11 version for backward-only
code [PR108056]

    Since GCC 12, the conversion between the array descriptors formats - the
    internal (GFC) and the C binding one (CFI) - moved to the compiler itse=
lf
    such that the cfi_desc_to_gfc_desc/gfc_desc_to_cfi_desc functions are o=
nly
    used with older code (GCC 9 to 11).  The newly added checks caused asse=
rts
    as older code did not pass the proper values (e.g. real(4) as effective
    argument arrived as BT_ASSUME type as the effective type got lost
inbetween).

    As proposed in the PR, revert to the GCC 11 version - known bugs is bet=
ter
    than some fixes and new issues. Still, GCC 12 is much better in terms of
    TS29113 support and should really be used.

    This patch uses the current libgomp version of the GCC 11 branch, except
    it fixes the GFC version number (which is 0), uses calloc instead of
malloc,
    and sets the lower bound to 1 instead of keeping it as is for
    CFI_attribute_other.

    (cherry picked from commit e205ec03f0794aeac3e8a89e947c12624d5a274e)

    (This cherry pick excludes an accidentally committed file, which was
    removed in follow-up commit 18af26fc375398f0a7cd7bae5aabebd447f8c899.)

    libgfortran/ChangeLog:

            PR libfortran/108056
            * runtime/ISO_Fortran_binding.c (cfi_desc_to_gfc_desc,
            gfc_desc_to_cfi_desc): Mostly revert to GCC 11 version for
            those backward-compatiblity-only functions.=