CXXFLAGS — CMake 3.10.2 Documentation

# CXXFLAGS

Default compilation flags to be used when compiling `CXX` (C++) files. Will only be used by CMake on the first configuration to determine `CXX` default compilation flags, after which the value for `CXXFLAGS` is stored in the cache as `CMAKE_CXX_FLAGS`. For any configuration run ( including the first), the environment variable will be ignored if the `CMAKE_CXX_FLAGS` variable is defined.