1SWIFTC 2------ 3 4.. versionadded:: 3.15 5 6.. include:: ENV_VAR.txt 7 8Preferred executable for compiling ``Swift`` language files. Will only be used by 9CMake on the first configuration to determine ``Swift`` compiler, after which the 10value for ``SWIFTC`` is stored in the cache as 11:variable:`CMAKE_Swift_COMPILER <CMAKE_<LANG>_COMPILER>`. For any configuration run 12(including the first), the environment variable will be ignored if the 13:variable:`CMAKE_Swift_COMPILER <CMAKE_<LANG>_COMPILER>` variable is defined. 14 15.. note:: 16 Options that are required to make the compiler work correctly can be included; 17 they can not be changed. 18 19.. code-block:: console 20 21 $ export SWIFTC="custom-compiler --arg1 --arg2" 22