[flang-commits] [flang] [llvm] [CMake] Fix using precompiled headers with ccache (PR #131397)

[Kajetan Puchalski via flang-commits]

mrkajetanp wrote:

Reverted for now on account of the Windows issues. I think there's a difference with how CMake expands `"${CCACHE_PROGRAM};${launcher_params}"` on some platforms? On Linux it expands to `ccache <params>` but apparently on this Windows build bot the whole thing was ending up quoted:
```
"C:\ninja\ccache.exe run_second_cpp=true hash_dir=true sloppiness=pch_defines,time_macros" C:\PROGRA~1
```

https://github.com/llvm/llvm-project/pull/131397