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rsadowski
ee49d4762d
"The base template for std::char_traits has been removed in LLVM 19. If you are using std::char_traits with types other than char, wchar_t, char8_t, char16_t, char32_t or a custom character type for which you specialized std::char_traits, your code will stop working. The Standard does not mandate that a base template is provided, and such a base template is bound to be incorrect for some types, which could currently cause unexpected behavior while going undetected." https://releases.llvm.org/19.1.0/projects/libcxx/docs/ReleaseNotes.htm This affects fmt 6.x used by MongoDB 4.4, which uses fmt::char8_t with std::char_traits. Add a minimal std::char_traits impl for fmt::char8_t based on the libc++ reference implementation for char traits: /libcxx/include/__string/char_traits.h This is a minimal fix to fix mongodb44 with libcxx19 from base. OK sthen@