https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79677
--- Comment #10 from Orion Poplawski <orion at cora dot nwra.com> --- I'm not sure how I'm practically supposed to handle this. In this case, for one sub-directory upstream adds -Wno-format to the flags: ./Utilities/KWIML/test/CMakeLists.txt: set(CMAKE_${lang}_FLAGS "${CMAKE_${lang}_FLAGS} -Wno-format") Is this still a bug in gcc?