CMAKE_LINK_DEF_FILE_FLAG ------------------------ Linker flag to be used to specify a ``.def`` file for dll creation. The flag will be used to add a ``.def`` file when creating a dll on Windows; this is only defined on Windows. CMake sets this variable automatically during toolchain inspection by calls to the :command:`project` or :command:`enable_language` commands. If the per-language :variable:`CMAKE__LINK_DEF_FILE_FLAG` variable is defined, it takes precedence over :variable:`!CMAKE_LINK_DEF_FILE_FLAG`.