LDFLAGSΒΆ
Will only be used by CMake on the first configuration to determine the default
linker flags, after which the value for LDFLAGS is stored in the cache
as CMAKE_EXE_LINKER_FLAGS_INIT,
CMAKE_SHARED_LINKER_FLAGS_INIT, and
CMAKE_MODULE_LINKER_FLAGS_INIT. For any configuration run
(including the first), the environment variable will be ignored if the
equivalent CMAKE_<TYPE>_LINKER_FLAGS_INIT variable is defined.