/usr/share/cmake-3.10/Help/envvar/RCFLAGS.rst is in cmake-data 3.10.2-1ubuntu2.
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1 2 3 4 5 6 7 8 9 | RCFLAGS
-------
Default compilation flags to be used when compiling ``resource`` files. Will
only be used by CMake on the first configuration to determine ``resource``
default compilation flags, after which the value for ``RCFLAGS`` is stored in
the cache as :variable:`CMAKE_RC_FLAGS <CMAKE_<LANG>_FLAGS>`. For any
configuration run (including the first), the environment variable will be ignored
if the :variable:`CMAKE_RC_FLAGS <CMAKE_<LANG>_FLAGS>` variable is defined.
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