[Bug libstdc++/108235] FAIL: g++.dg/compat/abi/bitfield1 cp_compat_x_tst.o-cp_compat_y_tst.o link

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108235

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:61da01772a3dff61cf23ba2ffba33bccb68d1063

commit r13-5052-g61da01772a3dff61cf23ba2ffba33bccb68d1063
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jan 6 18:39:14 2023 +0000

    libstdc++: Refactor time_zone::_Impl::rules_counter [PR108235]

    Abstract the atomic counter used to synchronize access to time_zone
    infos behind a Lockable class API, and use atomic_signed_lock_free
    instead of atomic<int_least32_t>, as that should be the most efficient
    type. (For futex-supporting targets it makes no difference, but might
    benefit other targets in future.)

    The new API allows the calling code to be simpler, without needing to
    repeat the same error prone preprocessor conditions in multiple places.
    It also allows using template metaprogramming to decide whether to use
    the atomic or a mutex, which gives us more flexibility than only using
    preprocessor conditions. That allows us to choose the mutex
    implementation for targets such as hppa-hp-hpux11.11 where 32-bit
    atomics are not lock-free and so would introduce an unwanted dependency
    on libatomic.

    libstdc++-v3/ChangeLog:

            PR libstdc++/108235
            * src/c++20/tzdb.cc (time_zone::_Impl::RulesCounter): New class
            template and partial specialization for synchronizing access to
            time_zone::_Impl::infos.
            (time_zone::_M_get_sys_info, reload_tzdb): Adjust uses of
            rules_counter.