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+function
+--------
+
+Start recording a function for later invocation as a command::
+
+  function(<name> [arg1 [arg2 [arg3 ...]]])
+    COMMAND1(ARGS ...)
+    COMMAND2(ARGS ...)
+    ...
+  endfunction(<name>)
+
+Define a function named ``<name>`` that takes arguments named ``arg1``,
+``arg2``, ``arg3``, (...).
+Commands listed after function, but before the matching
+:command:`endfunction()`, are not invoked until the function is invoked.
+When it is invoked, the commands recorded in the function are first
+modified by replacing formal parameters (``${arg1}``) with the arguments
+passed, and then invoked as normal commands.
+In addition to referencing the formal parameters you can reference the
+``ARGC`` variable which will be set to the number of arguments passed
+into the function as well as ``ARGV0``, ``ARGV1``, ``ARGV2``, ...  which
+will have the actual values of the arguments passed in.
+This facilitates creating functions with optional arguments.
+Additionally ``ARGV`` holds the list of all arguments given to the
+function and ``ARGN`` holds the list of arguments past the last expected
+argument.
+Referencing to ``ARGV#`` arguments beyond ``ARGC`` have undefined
+behavior. Checking that ``ARGC`` is greater than ``#`` is the only way
+to ensure that ``ARGV#`` was passed to the function as an extra
+argument.
+
+A function opens a new scope: see :command:`set(var PARENT_SCOPE)` for
+details.
+
+See the :command:`cmake_policy()` command documentation for the behavior
+of policies inside functions.