From Get docs
New in version 3.9.2.
This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
Default compilation flags to be used when compiling
CSharp files. Will only be used by CMake on the first configuration to determine
CSharp default compilation flags, after which the value for
CSFLAGS is stored in the cache as CMAKE_CSharp_FLAGS. For any configuration run (including the first), the environment variable will be ignored if the CMAKE_CSharp_FLAGS variable is defined.
See also CMAKE_CSharp_FLAGS_INIT.
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