...using CMAKE_CXX_STANDARD instead of CMAKE_CXX_FLAGS to set...
In CMake/README.md, there is this line in the sample CMakeLists.txt file: set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++ ${CMAKE_CXX_FLAGS}") The implication here is that if I want to compile with c++17, all I need to do is replace -std=...