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+codegen
+-------
+
+* The :ref:`Ninja Generators` and :ref:`Makefile Generators` now produce
+ a ``codegen`` build target. See policy :policy:`CMP0171`. It drives a
+ subset of the build graph sufficient to run custom commands created with
+ :command:`add_custom_command`'s new ``CODEGEN`` option.
+
+* The :command:`add_custom_command` command gained a ``CODEGEN`` option
+ to mark a custom commands outputs as dependencies of a ``codegen`` target.