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Subject: [Bug c++/99507] Can't return static address from immediate function
Date: Fri, 12 Mar 2021 09:12:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99507

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:425afe1f0c907e6469cef1672160c9c95177e71a

commit r11-7645-g425afe1f0c907e6469cef1672160c9c95177e71a
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Mar 12 10:11:24 2021 +0100

    c++: Fix up calls to immediate functions returning reference [PR99507]

    build_cxx_call calls convert_from_reference at the end, so if an immedi=
ate
    function returns a reference, we were constant evaluating not just that
    call, but that call wrapped in an INDIRECT_REF.  That unfortunately mea=
ns
    it can constant evaluate to something non-addressable, so if code later
    needs to take its address it will fail.

    The following patch fixes that by undoing the convert_from_reference
    wrapping for the cxx_constant_value evaluation and readdding it ad the =
end.

    2021-03-12  Jakub Jelinek  <jakub@redhat.com>

            PR c++/99507
            * call.c (build_over_call): For immediate evaluation of functio=
ns
            that return references, undo convert_from_reference effects bef=
ore
            calling cxx_constant_value and call convert_from_reference
            afterwards.

            * g++.dg/cpp2a/consteval19.C: New test.=