CMP0165

.. versionadded:: 3.30

:command:enable_language must not be called before :command:project.

In CMake 3.29 and below, if a project called :command:enable_language before the first call to :command:project, the language would be enabled but possibly using unset details that were expected to be set. In CMake 3.30 and above, :command:enable_language prefers to reject this case and stop with a fatal error instead if it detects that :command:project has not yet been called. This policy provides compatibility for projects that happened to work when :command:enable_language was called before :command:project and have not been updated to call these commands in the required order.

The OLD behavior for this policy is to allow :command:enable_language to be called before :command:project. The NEW behavior for this policy is to fail with a fatal error in such cases.

.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.30 .. |WARNS_OR_DOES_NOT_WARN| replace:: warns .. include:: include/STANDARD_ADVICE.rst

.. include:: include/DEPRECATED.rst