[Bug libstdc++/120650] Error of requesting %d from month_day_last is not detected at compile time

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120650

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-15 branch has been updated by Tomasz Kaminski
<tkami...@gcc.gnu.org>:

https://gcc.gnu.org/g:53d2ca1541b34bb2f840d5aede9b826025dd0bb7

commit r15-9876-g53d2ca1541b34bb2f840d5aede9b826025dd0bb7
Author: Tomasz KamiÅski <tkami...@redhat.com>
Date:   Tue Jun 24 09:17:12 2025 +0200

    libstdc++: Report compilation error on formatting "%d" from month_last
[PR120650]

    For month_day we incorrectly reported day information to be available,
which lead
    to format_error being thrown from the call to formatter::format at runtime,
instead
    of making call to format ill-formed.

            PR libstdc++/120650

    libstdc++-v3/ChangeLog:

            * include/bits/chrono_io.h
            (formatter<chrono::month_day_last,_CharT>::parse): Call _M_parse
with
            only Month being available.

    (cherry picked from commit 190aaaaf077fe5f318e168a7a1e1aa57058f377e)