The sccache may significantly reduce build times.
We need to evaluate real cases to see how much is to gain.
This patch enables sccache only on cmake, exluding one msvc target
with debug flag -Zi, which creates separate debug symbols.
Related sccache issue:
https://github.com/mozilla/sccache/issues/242
Task-number: COIN-130
Done-with: Aapo Keskimolo <aapo.keskimolo@qt.io>
Change-Id: Ic1f599c5194bcdee9528a548dabead1097821cd1
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
