CMAKE_<LANG>_FLAGS

Flags for all build types.

<LANG> flags used regardless of the value of CMAKE_BUILD_TYPE.

This is initialized for each language from environment variables:

• CMAKE_C_FLAGS: Initialized by the CFLAGS environment variable.
• CMAKE_CXX_FLAGS: Initialized by the CXXFLAGS environment variable.
• CMAKE_CUDA_FLAGS: Initialized by the CUDAFLAGS environment variable.
• CMAKE_Fortran_FLAGS: Initialized by the FFLAGS environment variable.