Add C++-Modules Based Linux CI workflow#4708
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Thanks for the PR. I don't think this deserves a whole new config, just add a more recent compiler (e.g. clang) to the existing config.
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The main purpose for the new config was to use a newer version of Ubuntu(24.04) for easier access to newer compilers. Also the config needs to use Ninja. The original config has easier access to older compilers. Trying to mix the two, is bringing up another set of issues. For example is we use the ninja generator with the older config, the builds fail because its attempting to scan for modules even in the older compilers. This is the issue that would be solved by #4709 Also, there may be a need to consider the range of compilers being supported for CI, perhaps the older ones can be dropped and we could move up to a different range like the one being supported in the newer config. |
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Thanks for merging #4709. Because of this, the single config for linux, both modern and older has been made possible. |
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- This adds a set of CI tests for linux that include compilers that support modules - This CI workflow uses ninja as the build system generator - Can be integrated with the other linux workflow after successful testing
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Merged, thanks! |
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# 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);
```
(fmtlib/fmt#4663,
fmtlib/fmt#4671,
fmtlib/fmt#4696,
fmtlib/fmt#4693,
fmtlib/fmt#4694,
fmtlib/fmt#4712,
fmtlib/fmt#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
(fmtlib/fmt#4684,
fmtlib/fmt#4685,
fmtlib/fmt#4707,
fmtlib/fmt#4708,
fmtlib/fmt#4702,
fmtlib/fmt#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%
(fmtlib/fmt#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) (fmtlib/fmt#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`
(fmtlib/fmt#4675). Thanks @17steen.
- Added overloads of `fmt::println` that take a `fmt::text_style`
(fmtlib/fmt#4782). Thanks @ahoarau.
- Added support for positional arguments as width and precision specifiers
in `fmt::printf` (fmtlib/fmt#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
(fmtlib/fmt#4611,
fmtlib/fmt#4612). Thanks @friedkeenan.
- Promoted `fmt::detail::named_arg` to the public API as `fmt::named_arg` and
deprecated the detail alias
(fmtlib/fmt#4683,
fmtlib/fmt#4687). Thanks @TPPPP72.
- Moved the `std::byte` formatter from `fmt/format.h` to `fmt/std.h`.
- Provided a default definition for `fmt::is_contiguous`
(fmtlib/fmt#4731,
fmtlib/fmt#4770). Thanks @user202729 and @phprus.
- Added the `FMT_USE_FLOCKFILE` macro to disable the use of `flockfile`
(fmtlib/fmt#4646,
fmtlib/fmt#4666). Thanks @mvastola.
- Added `include_guard(GLOBAL)` so that {fmt} can be used in multiple
submodules of the same project
(fmtlib/fmt#4672). Thanks @torsten48.
- Improved `constexpr` support
(fmtlib/fmt#4659,
fmtlib/fmt#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`
(fmtlib/fmt#4686,
fmtlib/fmt#4714,
fmtlib/fmt#4715).
Thanks @Yancey2023 and @sunmy2019.
- Fixed formatting of `std::tm` with a null `tm_zone`
(fmtlib/fmt#4790). Thanks @Carmel0.
- Fixed compile-time formatting in `fmt/ranges.h`, `fmt/style.h` and
`fmt/std.h` (fmtlib/fmt#4759). Thanks @j4niwzis.
- Fixed an ambiguity between `formatter<std::optional<T>>` in `fmt/std.h`
and `fmt/ranges.h` on C++26 (P3168R2)
(fmtlib/fmt#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
(fmtlib/fmt#4755).
- Fixed compile-time format string checks truncating string literals at
an embedded null byte
(fmtlib/fmt#4732). Thanks @user202729.
- Fixed out-of-bounds reads in `printf` formatting
(fmtlib/fmt#4741,
fmtlib/fmt#4742,
fmtlib/fmt#4800).
Thanks @Algunenano and @aizu-m.
- Fixed the return type of the `f(un)lockfile` wrappers on Windows
(fmtlib/fmt#4739). Thanks @mvastola.
- Worked around a CUDA issue when handling UTF-32 literals
(fmtlib/fmt#4719). Thanks @Cazadorro.
- Fixed missing named-argument validation for compiled format strings
(fmtlib/fmt#4638). Thanks @jaeheonshim.
- Fixed `fmt::format_to_n` in `<fmt/compile.h>` failing to compile when
`<iterator>` is not transitively included
(fmtlib/fmt#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
(fmtlib/fmt#4627). Thanks @marcel-behlau-elfin.
- Fixed a fallback range formatter for types with a `container_type` member
(fmtlib/fmt#4123,
fmtlib/fmt#4660). Thanks @soumik15630m.
- Fixed C++20 concept detection
(fmtlib/fmt#4653). Thanks @tearfur.
- Fixed a clang compilation failure
(fmtlib/fmt#4718). Thanks @mccakit.
- Fixed various MSVC warnings, including C4305 and conversion warnings on
x86 (fmtlib/fmt#4668,
fmtlib/fmt#4594).
Thanks @kanren3 and @blizzard4591.
- Updated the Android Gradle Plugin to 9.x
(fmtlib/fmt#4651,
fmtlib/fmt#4658). Thanks @soumik15630m.
- Made various code, build and test improvements
(fmtlib/fmt#4625,
fmtlib/fmt#4639,
fmtlib/fmt#4644,
fmtlib/fmt#4656,
fmtlib/fmt#4680,
fmtlib/fmt#4681,
fmtlib/fmt#4704,
fmtlib/fmt#4710,
fmtlib/fmt#4713,
fmtlib/fmt#4729,
fmtlib/fmt#4751,
fmtlib/fmt#4758,
fmtlib/fmt#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
(fmtlib/fmt#4622,
fmtlib/fmt#4626,
fmtlib/fmt#4631,
fmtlib/fmt#4667,
fmtlib/fmt#4616,
fmtlib/fmt#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`.
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Closes #4707