Viktor Szakats 60c3d04465 autotools: add support for 'unity' builds, enable in CI ... Implement the "unity" builds as known from CMake, but for autotools. It's limited to `lib` and `src` (CMake also supports it in `tests`). Enable with: `--enable-unity` (disabled by default) Unity builds speed up builds significantly. Cygwin and Windows builds in particular, but the effect is noticeable on most systems. It also allows discovering unity issues with autotools, benefitting also CMake when building the same combination. In CI it makes turnaround times quicker. This closes build performance with CMake. autotools still lags behind because it builds shared and static libcurl in two, separate passes. CMake does it in one. Manpage compilation isn't batched, it is in CMake. After unity and test bundle support the slowest parts of the build are the configuration phase (which is effectively a tedious, non-parallel, compilation and/or linking of 300+ tiny programs. The next bottleneck is compiling individual examples and finally test servers (only slow with autotools). The autotools implementation is slightly less efficient than CMake, because 3 sources are permanently excluded while in CMake this isn't necessary and solved more efficiently while building libtests. There is also no 'unity' support for tests, making them a less efficient also. Enable it in CI for most `configure` jobs. Except in GHA/dist (though it works fine there too), to use the default config there. Also skip for the Linux AWC-LC job where it made builds time a few seconds longer (reason undiscovered.) Autotools test suite builds compared between master -> `--enable-unity`: - GHA/Linux: 32s -> 12s https://github.com/curl/curl/actions/runs/10705668823/job/29681617374 https://github.com/curl/curl/actions/runs/10742978889/job/29796766297 - GHA/macOS: 37s -> 10s https://github.com/curl/curl/actions/runs/10705668813/job/29681632885 https://github.com/curl/curl/actions/runs/10742978699/job/29796768875 - GHA/FreeBSD: 15m25 -> 10m58 (full workflow time, ~qemu) https://github.com/curl/curl/actions/runs/10705668811/job/29681607915 https://github.com/curl/curl/actions/runs/10742978937/job/29796766115 - GHA/Cygwin: 3m32 -> 1m21 https://github.com/curl/curl/actions/runs/10705668809/job/29681609965 https://github.com/curl/curl/actions/runs/10742978645/job/29796756933 - GHA/MSYS2: 2m42 -> 50s https://github.com/curl/curl/actions/runs/10705668808/job/29681621166 https://github.com/curl/curl/actions/runs/10742978662/job/29799739289 - GHA/mingw-w64: 5m32 -> 1m23 https://github.com/curl/curl/actions/runs/10705668808/job/29681628787 https://github.com/curl/curl/actions/runs/10742978662/job/29799741568 Closes #14815		2024-09-20 23:53:33 +02:00
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config.yml	autotools: add support for 'unity' builds, enable in CI	2024-09-20 23:53:33 +02:00