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#23459: fmt-12.2.0
-------------------------+-------------------------
Reporter: Bruce Dubbs | Owner: Joe Locash
Type: enhancement | Status: closed
Priority: normal | Milestone: 13.1
Component: BOOK | Version: git
Severity: normal | Resolution: fixed
Keywords: |
-------------------------+-------------------------
Changes (by Joe Locash):
* resolution: => fixed
* status: assigned => closed
Comment:
{{{
# 12.2.0 - 2026-06-16
- Added a C11 API that brings fast, type-safe formatting to C. The new
`fmt-c` library and `fmt/fmt-c.h` header use `_Generic` to dispatch on
argument types and outperform `printf`/`sprintf`. For example:
```c++
#include <fmt/fmt-c.h>
fmt_print(stdout, "The answer is {}.\n", 42);
```
(https://github.com/fmtlib/fmt/issues/4663,
https://github.com/fmtlib/fmt/pull/4671,
https://github.com/fmtlib/fmt/pull/4696,
https://github.com/fmtlib/fmt/issues/4693,
https://github.com/fmtlib/fmt/pull/4694,
https://github.com/fmtlib/fmt/pull/4712,
https://github.com/fmtlib/fmt/pull/4789).
Thanks @Soumik15630m, @Ferdi265 and @localspook.
- Added a separate `fmt::fmt-module` CMake target for C++20 modules and a
CI workflow that exercises module-based builds
(https://github.com/fmtlib/fmt/issues/4684,
https://github.com/fmtlib/fmt/pull/4685,
https://github.com/fmtlib/fmt/issues/4707,
https://github.com/fmtlib/fmt/pull/4708,
https://github.com/fmtlib/fmt/pull/4702,
https://github.com/fmtlib/fmt/pull/4709).
Thanks @MathewBensonCode.
- Enabled the full Dragonbox lookup cache by default for floating-point
formatting unless optimizing for binary size (`__OPTIMIZE_SIZE__`),
giving a ~10–25% speedup. Thanks Matthias Kretz for the suggestion.
Average time per `double` on Apple M1 Pro (clang 17, random digits,
smaller is better) measured with
[dtoa-benchmark](https://github.com/fmtlib/dtoa-benchmark):
| Method | Time (ns) |
| ----------------------- | --------: |
| fmt (full) | 22.07 |
| fmt (compact) | 29.55 |
| ryu | 35.21 |
| double-conversion | 81.81 |
| `sprintf` | 726.27 |
| `ostringstream` | 864.34 |
- Improved integer formatting performance by ~3%
(https://github.com/fmtlib/fmt/pull/4630). Thanks @user202729.
- Optimized formatting into back-insert iterators by using bulk container
append/insert methods (e.g. on `std::vector<char>` and custom string
types) (https://github.com/fmtlib/fmt/pull/4679). Thanks @user202729.
- Reduced binary size of debug builds (~200k to ~85k in the bloat test)
and
improved compile speed when `consteval` is unavailable.
- Made path formatting lossless, preserving ill-formed UTF-16
sequences when converting `std::filesystem::path` to a narrow string.
- Added support for formatting `std::unexpected`
(https://github.com/fmtlib/fmt/pull/4675). Thanks @17steen.
- Added overloads of `fmt::println` that take a `fmt::text_style`
(https://github.com/fmtlib/fmt/pull/4782). Thanks @ahoarau.
- Added support for positional arguments as width and precision specifiers
in `fmt::printf` (https://github.com/fmtlib/fmt/pull/4643).
Thanks @KareemOtoum.
- Made `FMT_STRING` a no-op when `FMT_USE_CONSTEVAL` is enabled, since the
consteval format-string constructor already provides compile-time
validation
(https://github.com/fmtlib/fmt/issues/4611,
https://github.com/fmtlib/fmt/pull/4612). Thanks @friedkeenan.
- Promoted `fmt::detail::named_arg` to the public API as `fmt::named_arg`
and
deprecated the detail alias
(https://github.com/fmtlib/fmt/issues/4683,
https://github.com/fmtlib/fmt/pull/4687). Thanks @TPPPP72.
- Moved the `std::byte` formatter from `fmt/format.h` to `fmt/std.h`.
- Provided a default definition for `fmt::is_contiguous`
(https://github.com/fmtlib/fmt/pull/4731,
https://github.com/fmtlib/fmt/pull/4770). Thanks @user202729 and
@phprus.
- Added the `FMT_USE_FLOCKFILE` macro to disable the use of `flockfile`
(https://github.com/fmtlib/fmt/issues/4646,
https://github.com/fmtlib/fmt/pull/4666). Thanks @mvastola.
- Added `include_guard(GLOBAL)` so that {fmt} can be used in multiple
submodules of the same project
(https://github.com/fmtlib/fmt/pull/4672). Thanks @torsten48.
- Improved `constexpr` support
(https://github.com/fmtlib/fmt/pull/4659,
https://github.com/fmtlib/fmt/pull/4591).
Thanks @elbeno and @17steen.
- Deprecated the implicit conversion from `fmt::format_string` and
`fmt::basic_fstring` to `string_view` to align with
`std::format_string`;
use `format_string::get()` instead.
- Opted out `std::complex` from tuple formatting so that the dedicated
`std::complex` formatter is always used.
- Removed the `fmt::say` function.
- Deprecated the `std::initializer_list` overload of `fmt::join` and the
array
overload of `fmt::vformat_to`.
- Made the `<fmt/core.h>` header equivalent to `<fmt/base.h>` by
default. Code that relied on `<fmt/core.h>` pulling in `<fmt/format.h>`
must now either include `<fmt/format.h>` directly or define
`FMT_DEPRECATED_HEAVY_CORE` to opt back in.
- Improved `wchar_t` support: `fmt::join` now accepts `wchar_t` and other
non-`char` separators, and `fmt::format_to_n` now works with
`fmt::runtime`
on `wchar_t`
(https://github.com/fmtlib/fmt/pull/4686,
https://github.com/fmtlib/fmt/issues/4714,
https://github.com/fmtlib/fmt/pull/4715).
Thanks @Yancey2023 and @sunmy2019.
- Fixed formatting of `std::tm` with a null `tm_zone`
(https://github.com/fmtlib/fmt/pull/4790). Thanks @Carmel0.
- Fixed compile-time formatting in `fmt/ranges.h`, `fmt/style.h` and
`fmt/std.h` (https://github.com/fmtlib/fmt/pull/4759). Thanks @j4niwzis.
- Fixed an ambiguity between `formatter<std::optional<T>>` in `fmt/std.h`
and `fmt/ranges.h` on C++26 (P3168R2)
(https://github.com/fmtlib/fmt/pull/4761). Thanks @phprus.
- Fixed a GCC PCH breakage triggered by a scoped `#pragma GCC optimize`.
- Fixed a TSAN false positive in the locale handling code
(https://github.com/fmtlib/fmt/issues/4755).
- Fixed compile-time format string checks truncating string literals at
an embedded null byte
(https://github.com/fmtlib/fmt/pull/4732). Thanks @user202729.
- Fixed out-of-bounds reads in `printf` formatting
(https://github.com/fmtlib/fmt/issues/4741,
https://github.com/fmtlib/fmt/pull/4742,
https://github.com/fmtlib/fmt/pull/4800).
Thanks @Algunenano and @aizu-m.
- Fixed the return type of the `f(un)lockfile` wrappers on Windows
(https://github.com/fmtlib/fmt/pull/4739). Thanks @mvastola.
- Worked around a CUDA issue when handling UTF-32 literals
(https://github.com/fmtlib/fmt/pull/4719). Thanks @Cazadorro.
- Fixed missing named-argument validation for compiled format strings
(https://github.com/fmtlib/fmt/pull/4638). Thanks @JaeheonShim.
- Fixed `fmt::format_to_n` in `<fmt/compile.h>` failing to compile when
`<iterator>` is not transitively included
(https://github.com/fmtlib/fmt/issues/4615).
- Fixed handling of pointers in format string compilation with
`FMT_BUILTIN_TYPES=0`.
- Stopped assuming nul termination of the format string in `fmt::printf`.
Thanks @ZUENS2020 for reporting.
- Fixed a build error when locale support is disabled
(https://github.com/fmtlib/fmt/pull/4627). Thanks @marcel-behlau-elfin.
- Fixed a fallback range formatter for types with a `container_type`
member
(https://github.com/fmtlib/fmt/issues/4123,
https://github.com/fmtlib/fmt/pull/4660). Thanks @Soumik15630m.
- Fixed C++20 concept detection
(https://github.com/fmtlib/fmt/pull/4653). Thanks @tearfur.
- Fixed a clang compilation failure
(https://github.com/fmtlib/fmt/pull/4718). Thanks @mccakit.
- Fixed various MSVC warnings, including C4305 and conversion warnings on
x86 (https://github.com/fmtlib/fmt/pull/4668,
https://github.com/fmtlib/fmt/pull/4594).
Thanks @kanren3 and @blizzard4591.
- Updated the Android Gradle Plugin to 9.x
(https://github.com/fmtlib/fmt/issues/4651,
https://github.com/fmtlib/fmt/pull/4658). Thanks @Soumik15630m.
- Made various code, build and test improvements
(https://github.com/fmtlib/fmt/pull/4625,
https://github.com/fmtlib/fmt/pull/4639,
https://github.com/fmtlib/fmt/pull/4644,
https://github.com/fmtlib/fmt/pull/4656,
https://github.com/fmtlib/fmt/pull/4680,
https://github.com/fmtlib/fmt/pull/4681,
https://github.com/fmtlib/fmt/pull/4704,
https://github.com/fmtlib/fmt/pull/4710,
https://github.com/fmtlib/fmt/pull/4713,
https://github.com/fmtlib/fmt/pull/4729,
https://github.com/fmtlib/fmt/pull/4751,
https://github.com/fmtlib/fmt/pull/4758,
https://github.com/fmtlib/fmt/pull/4799).
Thanks @ZephyrLykos, @togunchan, @kagancansit, @BerndPetrovitsch,
@Skylion007, @st0rmbtw, @localspook and @EXtremeExploit.
- Improved documentation, including a rewrite of the format string syntax,
better handling of doxygen tags, documenting `output_file`, fixing CSS
so
that whitespace is displayed properly, and various smaller fixes
(https://github.com/fmtlib/fmt/pull/4622,
https://github.com/fmtlib/fmt/pull/4626,
https://github.com/fmtlib/fmt/pull/4631,
https://github.com/fmtlib/fmt/pull/4667,
https://github.com/fmtlib/fmt/pull/4616,
https://github.com/fmtlib/fmt/pull/4748).
Thanks @heavywatal, @ZephyrLykos, @user202729, @ssszcmawo, @bigmoonbit
and @Powerbyte7.
- Added building of release artifacts and SLSA provenance in CI, added a
CodeQL workflow, and added the security policy in `.github/SECURITY.md`.
}}}
Fixed at [sha:734e13ce14].
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