enh(build): enable support of PCH in unit tests
Description
Sight CMake targets of type TEST now build with precompiled headers, which speed-ups a bit the global build time.
Closes #681 (closed)
How to test it?
Just build.
Some results
Tested on Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
| Type | Compiler | Before | After |
|---|---|---|---|
| Debug | Clang | 7114,74s user 364,20s system 1143% cpu 10:54,28 total | 6193,87s user 333,44s system 1142% cpu 9:31,27 total |
| Debug | GCC | 9204,07s user 691,77s system 1109% cpu 14:51,56 total | ninja 9044,10s user 717,83s system 1126% cpu 14:26,53 total |
| Release | Clang | 12294,12s user 383,51s system 1158% cpu 18:14,47 total | 10121,28s user 316,13s system 1148% cpu 15:09,08 total |
| Release | GCC | 12232,54s user 575,74s system 1150% cpu 18:32,94 total | 10935,45s user 515,11s system 1130% cpu 16:53,16 total |