CMAKE_RULE_MESSAGES variable has no entry in cmake-variables document
I think it could be listed in https://cmake.org/cmake/help/latest/manual/cmake-variables.7.html
(cf https://cmake.org/cmake/help/latest/prop_gbl/RULE_MESSAGES.html)
I think it could be listed in https://cmake.org/cmake/help/latest/manual/cmake-variables.7.html
(cf https://cmake.org/cmake/help/latest/prop_gbl/RULE_MESSAGES.html)