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C++ Format v12.1.0 Release Notes

• • ⚡️ Optimized buffer::append, resulting in up to ~16% improvement on spdlog benchmarks (#4541). Thanks @fyrsta7.

  • Worked around an ABI incompatibility in std::locale_ref between clang and gcc (#4573).

  • Made std::variant and std::expected formatters work with format_as (#4574, #4575). Thanks @phprus.

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

  • Exported fmt::is_compiled_string and operator""_cf from the module (#4544). Thanks @CrackedMatter.

  • 🛠 Fixed a compatibility issue with C++ modules in clang (#4548). Thanks @tsarn.

  • ➕ Added support for cv-qualified types to the std::optional formatter (#4561, #4562). Thanks @OleksandrKvl.

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

  • 🆓 Switched to global malloc/free to enable allocator customization (#4569, #4570). Thanks @rohitsutreja.

  • 👉 Made the FMT_USE_CONSTEVAL macro configurable by users (#4546). Thanks @SnapperTT.

  • 🛠 Fixed compilation with locales disabled in the header-only mode (#4550).

  • 🛠 Fixed compilation with clang 21 and -std=c++20 (#4552).

  • 🛠 Fixed a dynamic linking issue with clang-cl (#4576, #4584). Thanks @FatihBAKIR.

  • 🛠 Fixed a warning suppression leakage on gcc (#4588). Thanks @ZedThree.

  • Made more internal color APIs constexpr (#4581). Thanks @ishani.

  • 🛠 Fixed compatibility with clang as a host compiler for NVCC (#4564). Thanks @valgur.

  • 🛠 Fixed various warnings and lint issues (#4565, #4572, #4557). Thanks @LiangHuDream and @teruyamato0731.

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

Previous changes from v12.0.0

• • ⚡️ Optimized the default floating point formatting (#3675, #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:

  • ➕ Added constexpr support to fmt::format. For example:

  • Added FMT_STATIC_FORMAT that allows formatting into a string of the exact required size at compile time.

  • 👌 Improved C++20 module support (#4451, #4459, #4476, #4488, #4491, #4495). Thanks @arBmind, @tkhyn, @Mishura4, @anonymouspc and @autoantwort.

  • Switched to using estimated display width in precision. For example:

  • 🛠 Fix interaction between debug presentation, precision, and width for strings (#4478). Thanks @localspook.

  • Implemented allocator propagation on basic_memory_buffer move (#4487, #4490). Thanks @toprakmurat.

  • Fixed an ambiguity between std::reference_wrapper<T> and format_as formatters (#4424, #4434). Thanks @jeremy-rifkin.

  • ✂ Removed the following deprecated APIs:

  • 🗄 Deprecated wide overloads of fmt::fprintf and fmt::sprintf.

  • 👌 Improved diagnostics for the incorrect usage of fmt::ptr (#4453). Thanks @TobiSchluter.

  • Made handling of ANSI escape sequences more efficient (#4511, #4528). Thanks @localspook and @Anas-Hamdane.

  • 🛠 Fixed a buffer overflow on all emphasis flags set (#4498). Thanks @dominicpoeschko.

  • 🛠 Fixed an integer overflow for precision close to the max int value.

  • 🛠 Fixed compatibility with WASI (#4496, #4497). Thanks @whitequark.

  • Fixed back_insert_iterator detection, preventing a fallback on slower path that handles arbitrary iterators (#4454).

  • 🛠 Fixed handling of invalid glibc FILE buffers (#4469).

  • ➕ Added wchar_t support to the std::byte formatter (#4479, #4480). Thanks @phprus.

  • 🏁 Changed component prefix from fmt- to fmt_ for compatibility with NSIS/CPack on Windows, e.g. fmt-doc changed to fmt_doc (#4441, #4442). Thanks @n-stein.

  • Added the FMT_CUSTOM_ASSERT_FAIL macro to simplify providing a custom fmt::assert_fail implementation (#4505). Thanks @HazardyKnusperkeks.

  • Switched to FMT_THROW on reporting format errors so that it can be overriden by users when exceptions are disabled (#4521). Thanks @HazardyKnusperkeks.

  • 👌 Improved master project detection and disabled install targets when using {fmt} as a subproject by default (#4536). Thanks @crueter.

  • Made various code improvements (#4445, #4448, #4473, #4522). Thanks @localspook, @tchaikov and @way4sahil.

  • ➕ Added Conan instructions to the docs (#4537). Thanks @uilianries.

  • ✂ Removed Bazel files to avoid issues with downstream packaging (#4530). Thanks @mering.

  • ➕ Added more entries for generated files to .gitignore (#4355, #4512). Thanks @dinomight and @localspook.

  • 🛠 Fixed various warnings and compilation issues (#4447, #4470, #4474, #4477, #4471, #4483, #4515, #4533, #4534). Thanks @dodomorandi, @localspook, @remyjette, @Tomek-Stolarczyk, @Mishura4, @mattiasljungstrom and @FatihBAKIR.

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