CMAKE_FASTBUILD_USE_LIGHTCACHE
-------------------------------

.. versionadded:: 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 <https://www.fastbuild.org/docs/functions/compiler.html>`_
for more information.
