CMAKE_FASTBUILD_CAPTURE_SYSTEM_ENV

Added in version 4.2.

Controls capturing of the system environment into fbuild.bff. Setting it to OFF makes the invocation of all tools (compilers and other external processes) hermetic.

Note

Setting this variable to OFF can break MSVC toolchains that rely on environment variables such as INCLUDE or LIB unless these are manually configured elsewhere.

Defaults to ON.

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