Use CXX_MODULE_STD

[ClausKlein]

Fix build problems with test module fmt

Update .TODO.txt

Use CXX_MODULE_STD

Upgrade to fmt v.12.0

Add patch step

Use pip install on CI

Use vsversion: 2022 on CI

Use g++--15 on Darwin if possible

Use g++-15 on Linux CI

Make it works at least on Darwin with g++-15

Make works on Linux with clang++-19

Update to fmt v12.1.0

Bump version: 12.1.0-dev0 -> 12.1.0-dev1

Feat: use CMAKE_CXX_STDLIB_MODULES_JSON from preset
    * This needs update for CMake v4.2

Quickfix for CI tests

Try to clean the CMake files

Cleanup with pre-commit

Disable BUILD_SHARED_LIBS for now

Upgrade pip requirements.txt

[ClausKlein]

make
# ...

[18/20] cd /Users/clausklein/Workspace/cpp/cxx20/fmt-module/build/dev && /Users/clausklein/.direnv/python-3.14/lib/python3.14/site-packages/cmake/data/bin/cmake -P cmake_install.cmake
-- Install configuration: "Release"
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/args.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/base.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/chrono.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/color.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/compile.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/core.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/format-inl.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/format.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/os.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/ostream.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/printf.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/ranges.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/std.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/include/fmt/xchar.h
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/libfmt.a
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/module/fmt.cppm
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/bmi-Clang_Release/fmt.pcm
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/module/format.cc
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/module/os.cc
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/fmtConfig.cmake
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/fmtConfigVersion.cmake
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/fmtTargets.cmake
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/fmtTargets-release.cmake
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/./cxx-modules-fmtTargets.cmake
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/./cxx-modules-fmtTargets-Release.cmake
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/stagedir/lib/cmake/fmt/./target-fmt-Release.cmake


Executing workflow step 3 of 4: test preset "dev"

Test project /Users/clausklein/Workspace/cpp/cxx20/fmt-module/build/dev
    Start 1: find-package-test
    Start 2: header-only-test
    Start 3: module_header-only-test
1/3 Test #3: module_header-only-test ..........   Passed    0.02 sec
2/3 Test #2: header-only-test .................   Passed    0.35 sec
3/3 Test #1: find-package-test ................   Passed    5.35 sec

100% tests passed, 0 tests failed out of 3

Total Test time (real) =   5.35 sec

Executing workflow step 4 of 4: package preset "dev"

CPack: Create package using TGZ
CPack: Install projects
CPack: - Install project: fmt []
CPack: Create package
CPack: - package: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/build/dev/fmt-12.1.0-Darwin.tar.gz generated.

bash-5.3$ ninja -C build/dev rebuild_cache 
ninja: Entering directory `build/dev'
[0/2] Re-checking globbed directories...
[0/2] Running CMake to regenerate build system...
-- use ccache
'brew' '--prefix' 'llvm'
-- CMAKE_CXX_COMPILER_IMPORT_STD=23;26
-- CMAKE_CXX_SCAN_FOR_MODULES=ON
-- CMAKE_CXX_MODULE_STD=ON
-- CPPdefinitions=FMT_USE_FCNTL=0;FMT_MODULE;FMT_IMPORT_STD
-- CPM: Adding package [email protected] (12.1.0 at /Users/clausklein/.cache/CPM/fmt/6226dc0d560c5dca8bcd81db09f7e2752ccb8cef)
-- FMT_USE_MODULES=ON
-- CMAKE_CXX_MODULE_STD=ON
-- CMAKE_CXX_COMPILER_IMPORT_STD=23;26
-- Module tests to be built: header-only-test
-- Configuring done (0.2s)
CMake Warning (dev) in CMakeLists.txt:
  CMake's support for `import std;` in C++23 and newer is experimental.  It
  is meant only for experimentation and feedback to CMake developers.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Generating done (0.0s)
-- Build files have been written to: /Users/clausklein/Workspace/cpp/cxx20/fmt-module/build/dev
bash-5.3$ ninja -C build/dev 
ninja: Entering directory `build/dev'
[0/2] Re-checking globbed directories...
[4/7] Generating CXX dyndep file tests/CMakeFiles/header-only-test.dir/CXX.dd
bash-5.3$ ninja -C build/dev 
ninja: Entering directory `build/dev'
[0/2] Re-checking globbed directories...
ninja: no work to do.
bash-5.3$ ninja -C build/dev test
ninja: Entering directory `build/dev'
[0/2] Re-checking globbed directories...
[0/2] Running tests...
Test project /Users/clausklein/Workspace/cpp/cxx20/fmt-module/build/dev
    Start 1: find-package-test
1/3 Test #1: find-package-test ................   Passed    4.21 sec
    Start 2: header-only-test
2/3 Test #2: header-only-test .................   Passed    0.01 sec
    Start 3: module_header-only-test
3/3 Test #3: module_header-only-test ..........   Passed    0.00 sec

100% tests passed, 0 tests failed out of 3

Total Test time (real) =   4.23 sec
bash-5.3$