[Bug libstdc++/116755] format and print functions prepend extra minus sign for min value of chrono duration type

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116755

--- Comment #16 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Jonathan Wakely
<r...@gcc.gnu.org>:

https://gcc.gnu.org/g:7ea30d4a5b211cc8ddda8f7f33bb2308b681be74

commit r13-9074-g7ea30d4a5b211cc8ddda8f7f33bb2308b681be74
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Wed Sep 18 17:20:29 2024 +0100

    libstdc++: Fix formatting of most negative chrono::duration [PR116755]

    When formatting chrono::duration<signed-integer-type, P>::min() we were
    causing undefined behaviour by trying to form the negative of the most
    negative value. If we convert negative durations with integer rep to the
    corresponding unsigned integer rep then we can safely represent all
    values.

    libstdc++-v3/ChangeLog:

            PR libstdc++/116755
            * include/bits/chrono_io.h (formatter<duration<R,P>>::format):
            Cast negative integral durations to unsigned rep.
            * testsuite/20_util/duration/io.cc: Test the most negative
            integer durations.

    (cherry picked from commit 482e651f5750e4648ade90e32ed45b094538e7f8)