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Subject: [Bug c++/104996] [10/11/12 Regression] Overload resolution over
 rvalue/const lvalue array reference parameters for an init. list argument
 incorrectly picks the const lvalue ref. overload
Date: Wed, 20 Apr 2022 14:15:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104996

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:5bde80f48bcc594658c788895ad1fd86d0916fc2

commit r12-8208-g5bde80f48bcc594658c788895ad1fd86d0916fc2
Author: Ed Catmur <ed@catmur.uk>
Date:   Mon Apr 18 23:09:04 2022 +0100

    c++: Fall through for arrays of T vs T cv [PR104996]

    If two arrays do not have the exact same element type including
    qualification, this could be e.g. f(int (&&)[]) vs. f(int const (&)[]),
    which can still be distinguished by the lvalue-rvalue tiebreaker.

    By tightening this branch (in accordance with the letter of the Standar=
d)
we
    fall through to the next branch, which tests whether they have different
    element type ignoring qualification and returns 0 in that case; thus we
only
    actually fall through in the T[...] vs. T cv[...] case, eventually
    considering the lvalue-rvalue tiebreaker at the end of compare_ics.

    Signed-off-by: Ed Catmur <ed@catmur.uk>

            PR c++/104996

    gcc/cp/ChangeLog:

            * call.cc (compare_ics): When comparing list-initialization
            sequences, do not return early.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/initlist129.C: New test.=