CMAKE_FASTBUILD_USE_LIGHTCACHE

Added in version 4.2.

Enables FASTBuild's light caching mode, which accelerates cache lookups by parsing source files directly (instead of invoking the compiler preprocessor).

See the FASTBuild Compiler() documentation for more information.

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https://cmake.org/cmake/help/latest/variable/CMAKE_FASTBUILD_USE_LIGHTCACHE.html