enable_language

Enable languages (CXX/C/OBJC/OBJCXX/Fortran/etc)

.. code-block:: cmake

enable_language(<lang>... [OPTIONAL])

Enables support for the named languages in CMake. This is the same as the :command:project command but does not create any of the extra variables that are created by the :command:project command.

.. include:: include/SUPPORTED_LANGUAGES.rst

The following restrictions apply to where enable_language() may be called:

It must be called in file scope, not in a :command:function call nor inside a :command:block().
It must not be called before the first call to :command:project. See policy :policy:CMP0165.
It must be called in the highest directory common to all targets using the named language directly for compiling sources or indirectly through link dependencies. It is simplest to enable all needed languages in the top-level directory of a project.

The OPTIONAL keyword is a placeholder for future implementation and does not currently work. Instead you can use the :module:CheckLanguage module to verify support before enabling.