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cmake_parse_arguments
---------------------
``cmake_parse_arguments`` is intended to be used in macros or functions for
parsing the arguments given to that macro or function. It processes the
arguments and defines a set of variables which hold the values of the
respective options.
::
cmake_parse_arguments(<prefix> <options> <one_value_keywords>
<multi_value_keywords> args...)
The ``<options>`` argument contains all options for the respective macro,
i.e. keywords which can be used when calling the macro without any value
following, like e.g. the ``OPTIONAL`` keyword of the :command:`install`
command.
The ``<one_value_keywords>`` argument contains all keywords for this macro
which are followed by one value, like e.g. ``DESTINATION`` keyword of the
:command:`install` command.
The ``<multi_value_keywords>`` argument contains all keywords for this
macro which can be followed by more than one value, like e.g. the
``TARGETS`` or ``FILES`` keywords of the :command:`install` command.
.. note::
All keywords shall be unique. I.e. every keyword shall only be specified
once in either ``<options>``, ``<one_value_keywords>`` or
``<multi_value_keywords>``. A warning will be emitted if uniqueness is
violated.
When done, ``cmake_parse_arguments`` will have defined for each of the
keywords listed in ``<options>``, ``<one_value_keywords>`` and
``<multi_value_keywords>`` a variable composed of the given ``<prefix>``
followed by ``"_"`` and the name of the respective keyword. These
variables will then hold the respective value from the argument list.
For the ``<options>`` keywords this will be ``TRUE`` or ``FALSE``.
All remaining arguments are collected in a variable
``<prefix>_UNPARSED_ARGUMENTS``, this can be checked afterwards to see
whether your macro was called with unrecognized parameters.
As an example here a ``my_install()`` macro, which takes similar arguments
as the real :command:`install` command:
.. code-block:: cmake
function(MY_INSTALL)
set(options OPTIONAL FAST)
set(oneValueArgs DESTINATION RENAME)
set(multiValueArgs TARGETS CONFIGURATIONS)
cmake_parse_arguments(MY_INSTALL "${options}" "${oneValueArgs}"
"${multiValueArgs}" ${ARGN} )
# ...
Assume ``my_install()`` has been called like this:
.. code-block:: cmake
my_install(TARGETS foo bar DESTINATION bin OPTIONAL blub)
After the ``cmake_parse_arguments`` call the macro will have set the
following variables::
MY_INSTALL_OPTIONAL = TRUE
MY_INSTALL_FAST = FALSE (was not used in call to my_install)
MY_INSTALL_DESTINATION = "bin"
MY_INSTALL_RENAME = "" (was not used)
MY_INSTALL_TARGETS = "foo;bar"
MY_INSTALL_CONFIGURATIONS = "" (was not used)
MY_INSTALL_UNPARSED_ARGUMENTS = "blub" (nothing expected after "OPTIONAL")
You can then continue and process these variables.
Keywords terminate lists of values, e.g. if directly after a
one_value_keyword another recognized keyword follows, this is
interpreted as the beginning of the new option. E.g.
``my_install(TARGETS foo DESTINATION OPTIONAL)`` would result in
``MY_INSTALL_DESTINATION`` set to ``"OPTIONAL"``, but as ``OPTIONAL``
is a keyword itself ``MY_INSTALL_DESTINATION`` will be empty and
``MY_INSTALL_OPTIONAL`` will therefore be set to ``TRUE``.
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