fmt

Optimized buffer::append, resulting in up to ~16% improvement on spdlog benchmarks (https://github.com/fmtlib/fmt/pull/4541). Thanks @fyrsta7.

Worked around an ABI incompatibility in std::locale_ref between clang and gcc (https://github.com/fmtlib/fmt/issues/4573).

Made std::variant and std::expected formatters work with format_as (https://github.com/fmtlib/fmt/issues/4574, h...

Optimized the default floating point formatting (https://github.com/fmtlib/fmt/issues/3675, https://github.com/fmtlib/fmt/issues/4516). In particular, formatting a double with format string compilation into a stack allocated buffer is more than 60% faster in version 12.0 compared to 11.2 according to dtoa-benchmark:

Function  Time (ns)  S...

Added the s specifier for std::error_code. It allows formatting an error message as a string. For example:

#include <fmt/std.h>

int main() {
  auto ec = std::make_error_code(std::errc::no_such_file_or_directory);
  fmt::print("{:s}\n", ec);
}

prints

No such file or directory

(The actual message is platform-specific.)

Fixed f...

Fixed ABI compatibility with earlier 11.x versions on Windows (https://github.com/fmtlib/fmt/issues/4359).

Improved the logic of switching between fixed and exponential format for float (https://github.com/fmtlib/fmt/issues/3649).

Moved is_compiled_string to the public API (https://github.com/fmtlib/fmt/issues/4342). Thanks @SwooshyCueb.

Simplified implementation of `operator"...

Fixed compilation on GCC 9.4 (https://github.com/fmtlib/fmt/issues/4313).

Worked around an internal compiler error when using C++20 modules with GCC 14.2 and earlier (https://github.com/fmtlib/fmt/issues/4295).

Worked around a bug in GCC 6 (https://github.com/fmtlib/fmt/issues/4318).

Fixed an issue caused by instantiating formatter<const T> (https://github.com/fmtlib/fmt/issues/...