# 12.1.0 - 2025-10-29

- Optimized `buffer::append`, resulting in up to ~16% improvement on spdlog
  benchmarks (fmtlib/fmt#4541). Thanks @fyrsta7.

- Worked around an ABI incompatibility in `std::locale_ref` between clang and
  gcc (fmtlib/fmt#4573).

- Made `std::variant` and `std::expected` formatters work with `format_as`
  (fmtlib/fmt#4574,
  fmtlib/fmt#4575). Thanks @phprus.

- Made `fmt::join<string_view>` work with C++ modules
  (fmtlib/fmt#4379,
  fmtlib/fmt#4577). Thanks @Arghnews.

- Exported `fmt::is_compiled_string` and `operator""_cf` from the module
  (fmtlib/fmt#4544). Thanks @CrackedMatter.

- Fixed a compatibility issue with C++ modules in clang
  (fmtlib/fmt#4548). Thanks @tsarn.

- Added support for cv-qualified types to the `std::optional` formatter
  (fmtlib/fmt#4561,
  fmtlib/fmt#4562). Thanks @OleksandrKvl.

- Added demangling support (used in exception and `std::type_info` formatters)
  for libc++ and clang-cl
  (fmtlib/fmt#4542,
  fmtlib/fmt#4560,
  fmtlib/fmt#4568,
  fmtlib/fmt#4571).
  Thanks @FatihBAKIR and @rohitsutreja.

- Switched to global `malloc`/`free` to enable allocator customization
  (fmtlib/fmt#4569,
  fmtlib/fmt#4570). Thanks @rohitsutreja.

- Made the `FMT_USE_CONSTEVAL` macro configurable by users
  (fmtlib/fmt#4546). Thanks @SnapperTT.

- Fixed compilation with locales disabled in the header-only mode
  (fmtlib/fmt#4550).

- Fixed compilation with clang 21 and `-std=c++20`
  (fmtlib/fmt#4552).

- Fixed a dynamic linking issue with clang-cl
  (fmtlib/fmt#4576,
  fmtlib/fmt#4584). Thanks @FatihBAKIR.

- Fixed a warning suppression leakage on gcc
  (fmtlib/fmt#4588). Thanks @ZedThree.

- Made more internal color APIs `constexpr`
  (fmtlib/fmt#4581). Thanks @ishani.

- Fixed compatibility with clang as a host compiler for NVCC
  (fmtlib/fmt#4564). Thanks @valgur.

- Fixed various warnings and lint issues
  (fmtlib/fmt#4565,
  fmtlib/fmt#4572,
  fmtlib/fmt#4557).
  Thanks @LiangHuDream and @teruyamato0731.

- Improved documentation
  (fmtlib/fmt#4549,
  fmtlib/fmt#4551,
  fmtlib/fmt#4566,
  fmtlib/fmt#4567,
  fmtlib/fmt#4578,).
  Thanks @teruyamato0731, @petersteneteg and @zimmerman-dev.