Currently the Windows CI doesn’t run the functional tests, see #18623 and fa50d11dd117eb6f91cbeac7476797f3885a6169
Also, it has been quite slow. On Linux a build with ccache finishes in a few minutes. On Windows it takes almost an hour, even with clcache. clcache apparently had no effect on the build time and has been removed in #18640
If someone has background in Windows build systems, they could help us speed up the build or even enable the functional tests again.
Maybe the issue is with appveyor, so an option could be to port the appveyor yaml to travis or cirrus ci and see if that fixes the problem.
Useful skills:
Experience with Windows powershell and Windows build systems
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