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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/104167] Implement C++20 std::chrono::utc_clock,
 std::chrono::tzdb etc.
Date: Fri, 08 Sep 2023 17:13:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104167

--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:294d11837367455499786578377c530a0238b6ca

commit r13-7782-g294d11837367455499786578377c530a0238b6ca
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Aug 31 18:31:32 2023 +0100

    libstdc++: Avoid useless dependency on read_symlink from tzdb

    chrono::tzdb::current_zone uses filesystem::read_symlink, which creates
    a dependency on the fs_ops.o object in libstdc++.a, which then creates
    dependencies on several OS functions if --gc-sections isn't used. For
    more details see PR libstdc++/104167 comment 8 and comment 11.

    In the cases where that causes linker failures, we probably don't have
    readlink anyway, so the filesystem::read_symlink call will always fail.
    Repeat the preprocessor conditions for filesystem::read_symlink in the
    body of chrono::tzdb::current_zone so that we don't create a
    dependency on fs_ops.o for a function that will always fail.

    libstdc++-v3/ChangeLog:

            * src/c++20/tzdb.cc (tzdb::current_zone): Check configure macros
            for POSIX readlink before using filesystem::read_symlink.

    (cherry picked from commit f2eb6132c6951edf7960a82828c571a1b98a1a09)=