New in version 3.7.
Value used to initialize the
CMAKE_<LANG>_FLAGS cache entry
the first time a build tree is configured for language
This variable is meant to be set by a
toolchain file. CMake may prepend or append content to
the value based on the environment and target platform. For example,
the contents of a
xxxFLAGS environment variable will be prepended,
xxx will be language-specific but not necessarily the same as
Fortran, and so on).
This value is a command-line string fragment. Therefore, multiple options
should be separated by spaces, and options with spaces should be quoted.
See also the configuration-specific