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api-error-handling.adoc
3.73
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2025-11-17 16:38
api-error-handling.html
35.21
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api-index-skel.adoc
432
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api-index.adoc
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api-index.html
30.43
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api-index.sh
714
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2025-11-17 16:38
api-merge.adoc
1.06
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api-merge.html
31.51
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2026-04-05 23:58
api-parse-options.adoc
13.01
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2025-11-17 16:38
api-parse-options.html
49.44
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api-path-walk.adoc
3.27
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2025-11-17 16:38
api-path-walk.html
34.28
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2026-04-05 23:58
api-simple-ipc.adoc
4.74
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2025-11-17 16:38
api-simple-ipc.html
35.49
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api-trace2.adoc
43.45
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api-trace2.html
86.12
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bitmap-format.adoc
14.66
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2025-11-17 16:38
bitmap-format.html
49.31
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build-systems.adoc
7.96
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2025-11-17 16:38
build-systems.html
41.02
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2026-04-05 23:58
bundle-uri.adoc
26.12
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2025-11-17 16:38
bundle-uri.html
63.08
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2026-04-05 23:58
commit-graph.adoc
17.7
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2025-11-17 16:38
commit-graph.html
52.61
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2026-04-05 23:58
directory-rename-detection.adoc
5.08
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directory-rename-detection.html
36.33
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hash-function-transition.adoc
35.45
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2025-11-17 16:38
hash-function-transition.html
75.42
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2026-04-05 23:58
large-object-promisors.adoc
26.59
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large-object-promisors.html
62.72
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2026-04-05 23:58
long-running-process-protocol.adoc
1.88
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2025-11-17 16:38
long-running-process-protocol.html
32.18
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2026-04-05 23:58
meson.build
1.49
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2025-11-17 16:38
multi-pack-index.adoc
11.31
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multi-pack-index.html
44.62
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2026-04-05 23:58
pack-heuristics.adoc
17.62
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2025-11-17 16:38
pack-heuristics.html
54.83
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2026-04-05 23:58
packfile-uri.adoc
3.66
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2025-11-17 16:38
packfile-uri.html
34.64
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2026-04-05 23:58
parallel-checkout.adoc
12.01
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parallel-checkout.html
44.27
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partial-clone.adoc
14.59
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partial-clone.html
48.96
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platform-support.adoc
8.95
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platform-support.html
40.71
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racy-git.adoc
8.91
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racy-git.html
41.04
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reftable.adoc
36.65
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2025-11-17 16:38
reftable.html
86.46
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remembering-renames.adoc
29.71
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remembering-renames.html
65.78
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2026-04-05 23:58
repository-version.adoc
3.19
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repository-version.html
33.92
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rerere.adoc
6.36
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rerere.html
38.33
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2026-04-05 23:58
scalar.adoc
2.87
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scalar.html
33.61
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2026-04-05 23:58
send-pack-pipeline.adoc
1.92
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send-pack-pipeline.html
32.41
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shallow.adoc
2.49
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shallow.html
32.77
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2026-04-05 23:58
sparse-checkout.adoc
46.68
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2025-11-17 16:38
sparse-checkout.html
92.36
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2026-04-05 23:58
sparse-index.adoc
9.28
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sparse-index.html
41.79
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2026-04-05 23:58
trivial-merge.adoc
4.16
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2025-11-17 16:38
trivial-merge.html
35.33
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2026-04-05 23:58
unit-tests.adoc
9.8
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2025-11-17 16:38
unit-tests.html
50.73
KB
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2026-04-05 23:58
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.hide-on-print{display:none!important} .print-only{display:block!important} .hide-for-print{display:none!important} .show-for-print{display:inherit!important}} @media print,amzn-kf8{#header>h1:first-child{margin-top:1.25rem} .sect1{padding:0!important} .sect1+.sect1{border:0} #footer{background:none} #footer-text{color:rgba(0,0,0,.6);font-size:.9em}} @media amzn-kf8{#header,#content,#footnotes,#footer{padding:0}} </style> </head> <body class="article"> <div id="header"> <h1>Build Systems</h1> </div> <div id="content"> <div id="preamble"> <div class="sectionbody"> <div class="paragraph"> <p>The build system is the primary way for both developers and system integrators to interact with the Git project. As such, being easy to use and extend for those who are not directly developing Git itself is just as important as other requirements we have on any potential build system.</p> </div> <div class="paragraph"> <p>This document outlines the different requirements that we have for the build system and then compares available build systems using these criteria.</p> </div> </div> </div> <div class="sect1"> <h2 id="_requirements">Requirements</h2> <div class="sectionbody"> <div class="paragraph"> <p>The following subsections present a list of requirements that we have for any potential build system. Sections are sorted by decreasing priority.</p> </div> <div class="sect2"> <h3 id="_platform_support">Platform support</h3> <div class="paragraph"> <p>The build system must have support for all of our platforms that we continually test against as outlined by our platform support policy. These platforms are:</p> </div> <div class="ulist"> <ul> <li> <p>Linux</p> </li> <li> <p>Windows</p> </li> <li> <p>macOS</p> </li> </ul> </div> <div class="paragraph"> <p>Furthermore, the build system should have support for the following platforms that generally have somebody running test pipelines against regularly:</p> </div> <div class="ulist"> <ul> <li> <p>AIX</p> </li> <li> <p>FreeBSD</p> </li> <li> <p>NetBSD</p> </li> <li> <p>NonStop</p> </li> <li> <p>OpenBSD</p> </li> </ul> </div> <div class="paragraph"> <p>The platforms which must be supported by the tool should be aligned with our platform support policy (see platform-support.adoc).</p> </div> </div> <div class="sect2"> <h3 id="_auto_detection_of_supported_features">Auto-detection of supported features</h3> <div class="paragraph"> <p>The build system must support auto-detection of features which are or aren’t available on the current platform. Platform maintainers should not be required to manually configure the complete build.</p> </div> <div class="paragraph"> <p>Auto-detection of the following items is considered to be important:</p> </div> <div class="ulist"> <ul> <li> <p>Check for the existence of headers.</p> </li> <li> <p>Check for the existence of libraries.</p> </li> <li> <p>Check for the existence of exectuables.</p> </li> <li> <p>Check for the runtime behavior of specific functions.</p> </li> <li> <p>Check for specific link order requirements when multiple libraries are involved.</p> </li> </ul> </div> </div> <div class="sect2"> <h3 id="_ease_of_use">Ease of use</h3> <div class="paragraph"> <p>The build system should be both easy to use and easy to extend. While this is naturally a subjective metric it is likely not controversial to say that some build systems are considerably harder to use than others.</p> </div> </div> <div class="sect2"> <h3 id="_ide_support">IDE support</h3> <div class="paragraph"> <p>The build system should integrate with well-known IDEs. Well-known IDEs include:</p> </div> <div class="ulist"> <ul> <li> <p>Microsoft Visual Studio</p> </li> <li> <p>Visual Studio Code</p> </li> <li> <p>Xcode</p> </li> </ul> </div> <div class="paragraph"> <p>There are four levels of support:</p> </div> <div class="ulist"> <ul> <li> <p>Native integration into the IDE.</p> </li> <li> <p>Integration into the IDE via a plugin.</p> </li> <li> <p>Integration into the IDE via generating a project description with the build system.</p> </li> <li> <p>No integration.</p> </li> </ul> </div> <div class="paragraph"> <p>Native integration is preferable, but integration via either a plugin or by generating a project description via the build system are considered feasible alternatives.</p> </div> <div class="paragraph"> <p>Another important distinction is the level of integration. There are two features that one generally wants to have:</p> </div> <div class="ulist"> <ul> <li> <p>Integration of build targets.</p> </li> <li> <p>Automatic setup of features like code completion with detected build dependencies.</p> </li> </ul> </div> <div class="paragraph"> <p>The first bullet point is the bare minimum, but is not sufficient to be considered proper integration.</p> </div> </div> <div class="sect2"> <h3 id="_out_of_tree_builds">Out-of-tree builds</h3> <div class="paragraph"> <p>The build system should support out-of-tree builds. Out-of-tree builds allow a developer to configure multiple different build directories with different configuration, e.g. one "debug" build and one "release" build.</p> </div> </div> <div class="sect2"> <h3 id="_cross_platform_builds">Cross-platform builds</h3> <div class="paragraph"> <p>The build system should support cross-platform builds, e.g. building for arm on an x86-64 host.</p> </div> </div> <div class="sect2"> <h3 id="_language_support">Language support</h3> <div class="paragraph"> <p>The following languages and toolchains are of relevance and should be supported by the build system:</p> </div> <div class="ulist"> <ul> <li> <p>C: the primary compiled language used by Git, must be supported. Relevant toolchains are GCC, Clang and MSVC.</p> </li> <li> <p>Rust: candidate as a second compiled lanugage, should be supported. Relevant toolchains is the LLVM-based rustc.</p> </li> </ul> </div> <div class="paragraph"> <p>Built-in support for the respective languages is preferred over support that needs to be wired up manually to avoid unnecessary complexity. Native support includes the following features:</p> </div> <div class="ulist"> <ul> <li> <p>Compiling objects.</p> </li> <li> <p>Dependency tracking.</p> </li> <li> <p>Detection of available features.</p> </li> <li> <p>Discovery of relevant toolchains.</p> </li> <li> <p>Linking libraries and executables.</p> </li> <li> <p>Templating placeholders in scripts.</p> </li> </ul> </div> </div> <div class="sect2"> <h3 id="_test_integration">Test integration</h3> <div class="paragraph"> <p>It should be possible to integrate tests into the build system such that it is possible to build and test Git within the build system. Features which are nice to have:</p> </div> <div class="ulist"> <ul> <li> <p>Track build-time dependencies for respective tests. Unit tests have different requirements than integration tests.</p> </li> <li> <p>Allow filtering of which tests to run.</p> </li> <li> <p>Allow running tests such that utilities like <code>test_pause</code> or <code>debug</code> work.</p> </li> </ul> </div> </div> </div> </div> <div class="sect1"> <h2 id="_comparison">Comparison</h2> <div class="sectionbody"> <div class="paragraph"> <p>The following list of build systems are considered:</p> </div> <div class="ulist"> <ul> <li> <p>GNU Make</p> </li> <li> <p>autoconf</p> </li> <li> <p>CMake</p> </li> <li> <p>Meson</p> </li> </ul> </div> <div class="sect2"> <h3 id="_gnu_make">GNU Make</h3> <div class="ulist"> <ul> <li> <p>Platform support: ubitquitous on all platforms, but not well-integrated into Windows.</p> </li> <li> <p>Auto-detection: no built-in support for auto-detection of features.</p> </li> <li> <p>Ease of use: easy to use, but discovering available options is hard. Makefile rules can quickly get out of hand once reaching a certain scope.</p> </li> <li> <p>IDE support: execution of Makefile targets is supported by many IDEs</p> </li> <li> <p>Out-of-tree builds: supported in theory, not wired up in practice.</p> </li> <li> <p>Cross-platform builds: supported in theory, not wired up in practice.</p> </li> <li> <p>Language support:</p> </li> <li> <p>C: Limited built-in support, many parts need to be wired up manually.</p> </li> <li> <p>Rust: No built-in support, needs to be wired up manually.</p> </li> <li> <p>Test integration: partially supported, many parts need to be wired up manually.</p> </li> </ul> </div> </div> <div class="sect2"> <h3 id="_autoconf">autoconf</h3> <div class="ulist"> <ul> <li> <p>Platform support: ubiquitous on all platforms, but not well-integrated into Windows.</p> </li> <li> <p>Auto-detection: supported.</p> </li> <li> <p>Ease of use: easy to use, discovering available options is comparatively easy. The autoconf syntax is prohibitively hard to extend though due to its complex set of interacting files and the hard-to-understand M4 language.</p> </li> <li> <p>IDE support: no integration into IDEs at generation time. The generated Makefiles have the same level of support as GNU Make.</p> </li> <li> <p>Out-of-tree builds: supported in theory, not wired up in practice.</p> </li> <li> <p>Cross-platform builds: supported.</p> </li> <li> <p>Language support:</p> </li> <li> <p>C: Limited built-in support, many parts need to be wired up manually.</p> </li> <li> <p>Rust: No built-in support, needs to be wired up manually.</p> </li> <li> <p>Test integration: partially supported, many parts need to be wired up manually.</p> </li> </ul> </div> </div> <div class="sect2"> <h3 id="_cmake">CMake</h3> <div class="ulist"> <ul> <li> <p>Platform support: not as extensive as GNU Make or autoconf, but all major platforms are supported.</p> </li> <li> <p>AIX</p> </li> <li> <p>Cygwin</p> </li> <li> <p>FreeBSD</p> </li> <li> <p>Linux</p> </li> <li> <p>OpenBSD</p> </li> <li> <p>Solaris</p> </li> <li> <p>Windows</p> </li> <li> <p>macOS</p> </li> <li> <p>Ease of use: easy to use, discovering available options is not always trivial. The scripting language used by CMake is somewhat cumbersome to use, but extending CMake build instructions is doable.</p> </li> <li> <p>IDE support: natively integrated into Microsoft Visual Studio. Can generate project descriptions for Xcode. An extension is available for Visual Studio Code. Many other IDEs have plugins for CMake.</p> </li> <li> <p>Out-of-tree builds: supported.</p> </li> <li> <p>Cross-platform builds: supported.</p> </li> <li> <p>Language support:</p> </li> <li> <p>C: Supported for GCC, Clang, MSVC and other toolchains.</p> </li> <li> <p>Rust: No built-in support, needs to be wired up manually.</p> </li> <li> <p>Test integration: supported, even though test dependencies are a bit cumbersome to use via "test fixtures". Interactive test runs are not supported.</p> </li> </ul> </div> </div> <div class="sect2"> <h3 id="_meson">Meson</h3> <div class="ulist"> <ul> <li> <p>Platform: not as extensive as GNU Make or autoconf, but all major platforms and some smaller ones are supported.</p> </li> <li> <p>AIX</p> </li> <li> <p>Cygwin</p> </li> <li> <p>DragonflyBSD</p> </li> <li> <p>FreeBSD</p> </li> <li> <p>Haiku</p> </li> <li> <p>Linux</p> </li> <li> <p>NetBSD</p> </li> <li> <p>OpenBSD</p> </li> <li> <p>Solaris</p> </li> <li> <p>Windows</p> </li> <li> <p>macOS</p> </li> <li> <p>Ease of use: easy to use, discovering available options is easy. The scripting language is straight-forward to use.</p> </li> <li> <p>IDE support: Supports generating build instructions for Xcode and Microsoft Visual Studio, a plugin exists for Visual Studio Code.</p> </li> <li> <p>Out-of-tree builds: supported.</p> </li> <li> <p>Cross-platform builds: supported.</p> </li> <li> <p>Language support:</p> </li> <li> <p>C: Supported for GCC, Clang, MSVC and other toolchains.</p> </li> <li> <p>Rust: Supported for rustc.</p> </li> <li> <p>Test integration: supported. Interactive tests are supported starting with Meson 1.5.0 via the <code>--interactive</code> flag.</p> </li> </ul> </div> </div> </div> </div> </div> <div id="footer"> <div id="footer-text"> Last updated 2025-11-17 16:38:17 UTC </div> </div> </body> </html>