CI: Enable cached builds #2
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LeonMatthesKDAB
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We use the embedded debug information for MSVC, because we ran into this error message in our windows CI: ``` FAILED: 3rdparty/fmt/CMakeFiles/fmt.dir/src/os.cc.obj sccache C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1440~1.338\bin\Hostx64\x64\cl.exe /nologo /TP -DKNUT_BUILDDATE=\"2024-06-07\" -DKNUT_VERSION=\"1.0\" -DKNUT_VERSION_STRING="\"1.0 (revision: c91adac)\"" -DTEST_DATA_PATH=\"D:/a/knut/knut/test_data\" -ID:\a\knut\knut\build-ci\3rdparty\fmt -ID:\a\knut\knut\3rdparty\fmt -ID:\a\knut\knut\build-ci\3rdparty\fmt\fmt_autogen\include -ID:\a\knut\knut\3rdparty\fmt\include /DWIN32 /D_WINDOWS /GR /EHsc /Zi /O2 /Ob1 /DNDEBUG -std:c++latest -MD /showIncludes /Fo3rdparty\fmt\CMakeFiles\fmt.dir\src\os.cc.obj /Fdfmt.pdb /FS -c D:\a\knut\knut\3rdparty\fmt\src\os.cc D:\a\knut\knut\3rdparty\fmt\src\os.cc: fatal error C1041: cannot open program database 'D:\a\knut\knut\build-ci\fmt.pdb'; if multiple CL.EXE write to the same .PDB file, please use /FS ``` Obviously /FS won't help, as that's already added. However, in this issue: https://gitlab.kitware.com/cmake/cmake/-/issues/20222, @mwestphal suggests that /Zi may be the issue. This makes sense, as that's what's forcing the use of a separate pdb file for debug info. If we use the Embedded format, this should fall back to /Z7, which includes the debug information within the object files themselves. So there should be no pdb file that can have lock contention.
We can adopt the strategy from CXX-Qt, which is working well. Hopefully now we get fully cached builds.
This should allow us to update the version information on each commit, but still cache most of the build. The single compilation unit for version.cpp won't be cached, but everything else can be cached, as the compiler arguments won't change on every commit.
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Forks are not allowed to update the cache
narnaud
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Jun 10, 2024
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We should be able to speed up our CI by caching the build artifacts using sccache like we do in https://github.com/KDAB/cxx-qt/.
My goal is to stick below 10 min. CI build if at all possible.
Part of #3