[cmake-developers] CMake strips MAKEFLAGS from environment

[Taylor Braun-Jones]

This is what I'm seeing:

$ echo 'message("MAKEFLAGS: $ENV{MAKEFLAGS}\nFOO: $ENV{FOO})"' >
CMakeLists.txt
$ MAKEFLAGS=test FOO=bar cmake .
-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is GNU 4.8.3
-- Check for working C compiler: /usr/lib64/ccache/cc
-- Check for working C compiler: /usr/lib64/ccache/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/lib64/ccache/c++
-- Check for working CXX compiler: /usr/lib64/ccache/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
MAKEFLAGS:
FOO: bar
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/test_env_makeflags

Why is CMake stripping MAKEFLAGS from its environment? I couldn't find any
documentation describing this as normal/expected behavior.

Thanks,
Taylor
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