The cmake warning is caused by Tino's "Quickfix" at revision 8853 in trunk.
These lines in BzrRevision.cmake trigger it the policy:
string(REGEX REPLACE "\n|\r$" "" WL_VERSION "${WL_VERSION}")
string(STRIP WL_VERSION "${WL_VERSION}")
file (WRITE ${CMAKE_CURRENT_BINARY_DIR}/VERSION "${WL_VERSION}")
See here:
https://cmake.org/cmake/help/v3.10/policy/CMP0054.html
adding this line to CMakeLists.txt solved the error:
cmake_policy(SET CMP0054 NEW)
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https://code.launchpad.net/~widelands-dev/widelands/remove_duplicate_code/+merge/355586
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