https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104167
--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:f2eb6132c6951edf7960a82828c571a1b98a1a09 commit r14-3616-gf2eb6132c6951edf7960a82828c571a1b98a1a09 Author: Jonathan Wakely <jwak...@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.
