https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116777
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- This is not a useful bug report, all you've shown is that some software somewhere fails to build. Please read https://gcc.gnu.org/bugs/ (In reply to Sergey Fedorov from comment #0) > libfmt upstream says this is a regression in libstdc++: > https://github.com/fmtlib/fmt/issues/4160 I was going to say that libfmt upstream is wrong to say it's a regression, but it looks like they never claimed that. You're using -D_GLIBCXX_USE_CXX11_ABI=0 which means time zones are not supported. They have never been supported with -D_GLIBCXX_USE_CXX11_ABI=0 so not a regression.
