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Introduce support for the Meson build system
Introduce support for the Meson build system, a "modern" meta build system that supports many different plaforms, including Linux, macOS, Windows and BSDs. Meson supports different backends, including Ninja, Xcode and Microsoft Visual Studio. Several common IDEs provide an integration with it. The biggest contender compared to Meson is probably CMake as outlined in our "Documentation/technical/build-systems.txt" file. Based on my own personal experience from working with both build systems extensively I strongly favor Meson over CMake. In my opinion, it feels significantly easier to use with a syntax that feels more like a "real" programming language. The second big reason is that Meson supports Rust natively, which may prove to be important given that the project is likely to pick up Rust as another language eventually. Using Meson is rather straight-forward. An example: ``` # Meson uses out-of-tree builds. You can set up multiple build # directories, how you name them is completely up to you. $ mkdir build $ cd build $ meson setup .. -Dprefix=/tmp/git-installation # Build the project. This also provides several other targets like e.g. `install` or `test`. $ ninja # Meson has been wired up to support execution of our test suites. # Both our unit tests and our integration tests are supported. # Running `meson test` without any arguments will execute all tests, # but the syntax supports globbing to select only some tests. $ meson test 't-*' # Execute single test interactively to allow fordebugging. $ meson test 't0000-*' --interactive --test-args=-ix ``` The build instructions have been successfully tested on the following systems, tests are passing: - Apple macOS 10.15. - FreeBSD 14.1, except gitweb-based tests. - NixOS 24.11. - Ubuntu 24.04. - Windows 10 with Cygwin, using `-Dperl=disabled -Dpython=disabled`. - Windows 10 with MinGW64, using `-Dperl=disabled -Dpython=disabled`. - Windows 10 with MSVC 2022, using `-Dperl=disabled -Dpython=disabled -Dgettext=disabled -Diconv=disabled --wrap-mode=forcefallback`. It is expected that there will still be rough edges in the current version. If this patch lands the expectation is that it will coexist with our other build systems for a while. Like this, distributions can slowly migrate over to Meson and report any findings they have to us such that we can continue to iterate. A potential cutoff date for other build systems may be Git 3.0. Some notes: - The installed distribution is structured somewhat differently than how it used to be the case. All of our binaries are installed into `$libexec/git-core`, while all binaries part of `$bindir` are now symbolic links pointing to the former. This rule is consistent in itself and thus easier to reason about. - We do not install dashed binaries into `$libexec/git-core` anymore. So there won't e.g. be a symlink for git-add(1). These are not required by modern Git and there isn't really much of a usecase for those anymore. By not installing those symlinks we thus start the deprecation of this layout. - Support for installing documentation has not been wired up yet. This will follow if the project can agree on Meson as build system. - Documentation does not yet exist. Same here, it will follow if the project can agree on Meson. - We're targeting a Meson 1.3.0, which has been released relatively recently November 2023. The only feature we use from that version is `fs.relative_to()`, which we could replace if necessary. If so, we could start to target Meson 1.0.0 and newer, released in December 2022. - The whole build instructions count around 3000 lines, half of which is listing all of our code and test files. Our Makefiles are around 5000 lines, autoconf adds another 1300 lines. CMake in comparison has only 1200 linescode, but it avoids listing individual files and does not wire up auto-configuration as extensively as the Meson instructions do. - We bundle a set of subproject wrappers for curl, expat, openssl, pcre2 and zlib. This allows developers to build Git without these dependencies preinstalled, and Meson will fetch and build them automatically. This is especially helpful on Windows. Signed-off-by: Patrick Steinhardt <[email protected]> Signed-off-by: Junio C Hamano <[email protected]>
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‎bin-wrappers/meson.build‎

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bin_wrappers_config = configuration_data()
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foreach key, value : {
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'BUILD_DIR': meson.project_build_root(),
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'MERGE_TOOLS_DIR': meson.project_source_root() / 'mergetools',
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'TEMPLATE_DIR': meson.project_build_root() / 'templates',
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'GIT_TEXTDOMAINDIR': meson.project_build_root() / 'po',
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'GITPERLLIB': meson.project_build_root() / 'perl/lib',
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}
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# Paths need to be Unix-style without drive prefixes as they get added to the
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# PATH variable. And given that drive prefixes contain a colon we'd otherwise
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# end up with a broken PATH if we didn't convert them.
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if cygpath.found()
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value = run_command(cygpath, value, check: true).stdout().strip()
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endif
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bin_wrappers_config.set(key, value)
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endforeach
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foreach executable : bin_wrappers
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executable_config = configuration_data()
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executable_config.merge_from(bin_wrappers_config)
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executable_config.set('PROG', fs.relative_to(executable.full_path(), meson.project_build_root()))
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configure_file(
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input: 'wrap-for-bin.sh',
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output: fs.stem(executable.full_path()),
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configuration: executable_config,
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)
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endforeach

‎contrib/completion/meson.build‎

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foreach script : [
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'git-completion.bash',
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'git-completion.tcsh',
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'git-completion.zsh',
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'git-prompt.sh'
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]
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test_dependencies += fs.copyfile(script)
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endforeach

‎contrib/meson.build‎

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subdir('completion')

‎gitweb/meson.build‎

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configure_file(
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input: 'gitweb.perl',
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output: 'gitweb.cgi',
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configuration: {
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'GIT_VERSION': meson.project_version(),
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'GIT_BINDIR': get_option('prefix') / get_option('bindir'),
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'GITWEB_CONFIG': get_option('gitweb_config'),
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'GITWEB_CONFIG_SYSTEM': get_option('gitweb_config_system'),
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'GITWEB_CONFIG_COMMON': get_option('gitweb_config_common'),
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'GITWEB_HOME_LINK_STR': get_option('gitweb_home_link_str'),
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'GITWEB_SITENAME': get_option('gitweb_sitename'),
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'GITWEB_PROJECTROOT': get_option('gitweb_projectroot'),
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'GITWEB_PROJECT_MAXDEPTH': get_option('gitweb_project_maxdepth'),
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'GITWEB_EXPORT_OK': get_option('gitweb_export_ok'),
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'GITWEB_STRICT_EXPORT': get_option('gitweb_strict_export'),
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'GITWEB_BASE_URL': get_option('gitweb_base_url'),
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'GITWEB_LIST': get_option('gitweb_list'),
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'GITWEB_HOMETEXT': get_option('gitweb_hometext'),
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'GITWEB_CSS': get_option('gitweb_css'),
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'GITWEB_LOGO': get_option('gitweb_logo'),
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'GITWEB_FAVICON': get_option('gitweb_favicon'),
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'GITWEB_JS': get_option('gitweb_js'),
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'GITWEB_SITE_HTML_HEAD_STRING': get_option('gitweb_site_html_head_string'),
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'GITWEB_SITE_HEADER': get_option('gitweb_site_header'),
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'GITWEB_SITE_FOOTER': get_option('gitweb_site_footer'),
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'HIGHLIGHT_BIN': get_option('highlight_bin'),
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},
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install: true,
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install_dir: get_option('datadir') / 'gitweb',
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)
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subdir('static')

‎gitweb/static/meson.build‎

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foreach asset : [
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'git-favicon.png',
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'git-logo.png',
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'gitweb.css',
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]
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fs.copyfile(asset,
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install: true,
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install_dir: get_option('datadir') / 'gitweb/static',
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)
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endforeach
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javascript_sources = [
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meson.current_source_dir() / 'js/adjust-timezone.js',
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meson.current_source_dir() / 'js/blame_incremental.js',
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meson.current_source_dir() / 'js/javascript-detection.js',
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meson.current_source_dir() / 'js/lib/common-lib.js',
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meson.current_source_dir() / 'js/lib/cookies.js',
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meson.current_source_dir() / 'js/lib/datetime.js',
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]
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custom_target(
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input: javascript_sources,
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output: 'gitweb.js',
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capture: true,
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command: ['cat'] + javascript_sources,
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install: true,
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install_dir: get_option('datadir') / 'gitweb/static',
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)

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