https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108221
--- Comment #4 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:8c330fd49464f3d47a7c171d767eb3a011add76b commit r13-5047-g8c330fd49464f3d47a7c171d767eb3a011add76b Author: Jonathan Wakely <jwak...@redhat.com> Date: Thu Jan 5 14:04:32 2023 +0000 libstdc++: Disable broken std::format for floating-point types [PR108221] If we don't have std::to_chars for floating-point types (either because float and double are not IEEE format, or size_t is 16-bit) then we can't use them with std::format. This causes a bootstrap failure since std/c++20/tzdb.cc was added to the library, because <chrono> now includes <format>. This change just disables formatting support for those types. This is not a proper fix, but solves the bootstrap failure for now. libstdc++-v3/ChangeLog: PR libstdc++/108221 * include/std/format (basic_format_arg) [!__cpp_lib_to_chars]: Disable visiting floating-point types.
