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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/104167] Implement C++20 std::chrono::utc_clock,
 std::chrono::tzdb etc.
Date: Tue, 29 Aug 2023 19:55:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104167

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
My best guess is that including <chrono> in those files causes a dependency=
 on
std::chrono::tzdb::current_zone() which depends on
std::filesystem::read_symlink, which will pull in the symbols in
src/c++17/fs_ops.cc

Does arm-eabi build libstdc++.a with -ffunction-sections?

The tests should be built with -Wl,--gc-sections which combined with
-ffunction-sections should mean that the tests do not pull in symbols they
don't need.

I would *really* prefer not to have to split src/c++20/tzdb.cc and
src/c++17/fs_*.cc into dozens of separate files.

Please file a separate bug for these failures.=