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|
define_property
---------------
Define and document custom properties.
.. code-block:: cmake
define_property(<GLOBAL | DIRECTORY | TARGET | SOURCE |
TEST | VARIABLE | CACHED_VARIABLE>
PROPERTY <name> [INHERITED]
[BRIEF_DOCS <brief-doc> [docs...]]
[FULL_DOCS <full-doc> [docs...]]
[INITIALIZE_FROM_VARIABLE <variable>])
Defines one property in a scope for use with the :command:`set_property` and
:command:`get_property` commands. It is mainly useful for defining the way
a property is initialized or inherited. Historically, the command also
associated documentation with a property, but that is no longer considered a
primary use case.
The first argument determines the kind of scope in which the property should
be used. It must be one of the following:
::
GLOBAL = associated with the global namespace
DIRECTORY = associated with one directory
TARGET = associated with one target
SOURCE = associated with one source file
TEST = associated with a test named with add_test
VARIABLE = documents a CMake language variable
CACHED_VARIABLE = documents a CMake cache variable
Note that unlike :command:`set_property` and :command:`get_property` no
actual scope needs to be given; only the kind of scope is important.
The required ``PROPERTY`` option is immediately followed by the name of
the property being defined.
If the ``INHERITED`` option is given, then the :command:`get_property` command
will chain up to the next higher scope when the requested property is not set
in the scope given to the command.
* ``DIRECTORY`` scope chains to its parent directory's scope, continuing the
walk up parent directories until a directory has the property set or there
are no more parents. If still not found at the top level directory, it
chains to the ``GLOBAL`` scope.
* ``TARGET``, ``SOURCE`` and ``TEST`` properties chain to ``DIRECTORY`` scope,
including further chaining up the directories, etc. as needed.
Note that this scope chaining behavior only applies to calls to
:command:`get_property`, :command:`get_directory_property`,
:command:`get_target_property`, :command:`get_source_file_property` and
:command:`get_test_property`. There is no inheriting behavior when *setting*
properties, so using ``APPEND`` or ``APPEND_STRING`` with the
:command:`set_property` command will not consider inherited values when working
out the contents to append to.
The ``BRIEF_DOCS`` and ``FULL_DOCS`` options are followed by strings to be
associated with the property as its brief and full documentation.
CMake does not use this documentation other than making it available to the
project via corresponding options to the :command:`get_property` command.
.. versionchanged:: 3.23
The ``BRIEF_DOCS`` and ``FULL_DOCS`` options are optional.
.. versionadded:: 3.23
The ``INITIALIZE_FROM_VARIABLE`` option specifies a variable from which the
property should be initialized. It can only be used with target properties.
The ``<variable>`` name must end with the property name and must not begin
with ``CMAKE_`` or ``_CMAKE_``. The property name must contain at least one
underscore. It is recommended that the property name have a prefix specific
to the project.
See Also
^^^^^^^^
* :command:`get_property`
* :command:`set_property`
|
