CMAKE_<LANG>_FLAGSΒΆ
Language-wide flags for language <LANG> used when building for
all configurations. These flags will be passed to all invocations
of the compiler. This includes invocations that drive compiling
and those that drive linking.
For each language, if this variable is not defined, it is initialized and stored in the cache using values from environment variables in combination with CMake's builtin defaults for the toolchain:
CMAKE_C_FLAGS: Initialized by theCFLAGSenvironment variable.CMAKE_CXX_FLAGS: Initialized by theCXXFLAGSenvironment variable.CMAKE_CUDA_FLAGS: Initialized by theCUDAFLAGSenvironment variable.CMAKE_Fortran_FLAGS: Initialized by theFFLAGSenvironment variable.CMAKE_CSharp_FLAGS: Initialized by theCSFLAGSenvironment variable.CMAKE_HIP_FLAGS: Initialized by theHIPFLAGSenvironment variable.CMAKE_ISPC_FLAGS: Initialized by theISPCFLAGSenvironment variable.
This value is a command-line string fragment. Therefore, multiple options should be separated by spaces, and options with spaces should be quoted.
The flags in this variable will be passed before those in the
per-configuration CMAKE_<LANG>_FLAGS_<CONFIG> variable.
On invocations driving compiling, flags from both variables will be passed
before flags added by commands such as add_compile_options() and
target_compile_options(). On invocations driving linking,
they will be passed before flags added by commands such as
add_link_options() and target_link_options().