CMP0215

.. versionadded:: 4.4

:ref:Ninja Generators emit Swift modules separately from compilation.

In CMake 4.3 and below, Swift targets built by :ref:Ninja Generators emit .swiftmodule from the Swift compile edge together with object files. Because Ninja treats a build edge as atomic, downstream Swift targets must wait for compilation outputs to finish before they can use the module interface.

CMake 4.4 and above prefer to emit .swiftmodule from a dedicated -emit-module build edge so that downstream Swift targets can begin compiling as soon as the module interface is available. This policy provides compatibility with projects that have not been updated.

The OLD behavior for this policy is to not emit modules separately. The NEW behavior for this policy is to emit .swiftmodule from a dedicated build edge for importable Swift targets by default.

The :prop_tgt:Swift_SEPARATE_MODULE_EMISSION target property and corresponding :variable:CMAKE_Swift_SEPARATE_MODULE_EMISSION variable may be set to enable or disable the behavior on a per-target basis.

.. note::

Separate module emission takes effect only when policy :policy:CMP0157 is set to NEW prior to the first :command:project or :command:enable_language command that enables the Swift language. The dedicated .swiftmodule edge is available only in the split Swift build model.

.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 4.4 .. |WARNS_OR_DOES_NOT_WARN| replace:: does not warn .. include:: include/STANDARD_ADVICE.rst

.. include:: include/DEPRECATED.rst