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212 lines
7.9 KiB
212 lines
7.9 KiB
project
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-------
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Set the name of the project.
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Synopsis
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^^^^^^^^
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.. code-block:: cmake
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project(<PROJECT-NAME> [<language-name>...])
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project(<PROJECT-NAME>
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[VERSION <major>[.<minor>[.<patch>[.<tweak>]]]]
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[DESCRIPTION <project-description-string>]
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[HOMEPAGE_URL <url-string>]
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[LANGUAGES <language-name>...])
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Sets the name of the project, and stores it in the variable
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:variable:`PROJECT_NAME`. When called from the top-level
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``CMakeLists.txt`` also stores the project name in the
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variable :variable:`CMAKE_PROJECT_NAME`.
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Also sets the variables:
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:variable:`PROJECT_SOURCE_DIR`, :variable:`<PROJECT-NAME>_SOURCE_DIR`
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Absolute path to the source directory for the project.
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:variable:`PROJECT_BINARY_DIR`, :variable:`<PROJECT-NAME>_BINARY_DIR`
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Absolute path to the binary directory for the project.
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:variable:`PROJECT_IS_TOP_LEVEL`, :variable:`<PROJECT-NAME>_IS_TOP_LEVEL`
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.. versionadded:: 3.21
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Boolean value indicating whether the project is top-level.
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Further variables are set by the optional arguments described in `Options`_
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further below. Where an option is not given, its corresponding variable is
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set to the empty string.
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Note that variables of the form ``<name>_SOURCE_DIR`` and ``<name>_BINARY_DIR``
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may also be set by other commands before ``project()`` is called (see the
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:command:`FetchContent_MakeAvailable` command for one example).
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Projects should not rely on ``<PROJECT-NAME>_SOURCE_DIR`` or
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``<PROJECT-NAME>_BINARY_DIR`` holding a particular value outside of the scope
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of the call to ``project()`` or one of its child scopes.
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.. versionchanged:: 3.30.3
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``<PROJECT-NAME>_SOURCE_DIR``, ``<PROJECT-NAME>_BINARY_DIR``, and
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``<PROJECT-NAME>_IS_TOP_LEVEL`` are always set as non-cache variables by
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``project(<PROJECT-NAME> ...)``.
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.. versionchanged:: 3.30.4
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The variables ``<PROJECT-NAME>_SOURCE_DIR``, ``<PROJECT-NAME>_BINARY_DIR``,
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and ``<PROJECT-NAME>_IS_TOP_LEVEL`` are only set as non-cache variables if
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they are already set as cache or non-cache variables when
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``project(<PROJECT-NAME> ...)`` is called.
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Note that this logic is flawed, as it can result in different behavior
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between the first and subsequent runs because cache variables won't exist
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on the first run, but they will on subsequent runs.
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.. versionchanged:: 3.30.5
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The variables ``<PROJECT-NAME>_SOURCE_DIR``, ``<PROJECT-NAME>_BINARY_DIR``,
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and ``<PROJECT-NAME>_IS_TOP_LEVEL`` are only set as non-cache variables if
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they are already set as non-cache variables when
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``project(<PROJECT-NAME> ...)`` is called.
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Unlike the flawed behavior of 3.30.4, non-cache variables will not be set
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if only cache variables of the same name are set.
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Options
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^^^^^^^
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The options are:
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``VERSION <version>``
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Optional; may not be used unless policy :policy:`CMP0048` is
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set to ``NEW``.
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Takes a ``<version>`` argument composed of non-negative integer components,
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i.e. ``<major>[.<minor>[.<patch>[.<tweak>]]]``,
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and sets the variables
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* :variable:`PROJECT_VERSION`,
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:variable:`<PROJECT-NAME>_VERSION`
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* :variable:`PROJECT_VERSION_MAJOR`,
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:variable:`<PROJECT-NAME>_VERSION_MAJOR`
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* :variable:`PROJECT_VERSION_MINOR`,
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:variable:`<PROJECT-NAME>_VERSION_MINOR`
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* :variable:`PROJECT_VERSION_PATCH`,
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:variable:`<PROJECT-NAME>_VERSION_PATCH`
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* :variable:`PROJECT_VERSION_TWEAK`,
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:variable:`<PROJECT-NAME>_VERSION_TWEAK`.
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.. versionadded:: 3.12
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When the ``project()`` command is called from the top-level
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``CMakeLists.txt``, then the version is also stored in the variable
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:variable:`CMAKE_PROJECT_VERSION`.
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``DESCRIPTION <project-description-string>``
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.. versionadded:: 3.9
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Optional.
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Sets the variables
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* :variable:`PROJECT_DESCRIPTION`, :variable:`<PROJECT-NAME>_DESCRIPTION`
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to ``<project-description-string>``.
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It is recommended that this description is a relatively short string,
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usually no more than a few words.
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When the ``project()`` command is called from the top-level ``CMakeLists.txt``,
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then the description is also stored in the variable :variable:`CMAKE_PROJECT_DESCRIPTION`.
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.. versionadded:: 3.12
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Added the ``<PROJECT-NAME>_DESCRIPTION`` variable.
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``HOMEPAGE_URL <url-string>``
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.. versionadded:: 3.12
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Optional.
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Sets the variables
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* :variable:`PROJECT_HOMEPAGE_URL`, :variable:`<PROJECT-NAME>_HOMEPAGE_URL`
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to ``<url-string>``, which should be the canonical home URL for the project.
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When the ``project()`` command is called from the top-level ``CMakeLists.txt``,
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then the URL also is stored in the variable :variable:`CMAKE_PROJECT_HOMEPAGE_URL`.
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``LANGUAGES <language-name>...``
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Optional.
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Can also be specified without ``LANGUAGES`` keyword per the first, short signature.
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Selects which programming languages are needed to build the project.
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.. include:: SUPPORTED_LANGUAGES.txt
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By default ``C`` and ``CXX`` are enabled if no language options are given.
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Specify language ``NONE``, or use the ``LANGUAGES`` keyword and list no languages,
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to skip enabling any languages.
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The variables set through the ``VERSION``, ``DESCRIPTION`` and ``HOMEPAGE_URL``
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options are intended for use as default values in package metadata and documentation.
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.. _`Code Injection`:
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Code Injection
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^^^^^^^^^^^^^^
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A number of variables can be defined by the user to specify files to include
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at different points during the execution of the ``project()`` command.
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The following outlines the steps performed during a ``project()`` call:
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* .. versionadded:: 3.15
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For every ``project()`` call regardless of the project
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name, include the file(s) and module(s) named by
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:variable:`CMAKE_PROJECT_INCLUDE_BEFORE`, if set.
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* .. versionadded:: 3.17
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If the ``project()`` command specifies ``<PROJECT-NAME>`` as its project
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name, include the file(s) and module(s) named by
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:variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE`, if set.
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* Set the various project-specific variables detailed in the `Synopsis`_
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and `Options`_ sections above.
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* For the very first ``project()`` call only:
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* If :variable:`CMAKE_TOOLCHAIN_FILE` is set, read it at least once.
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It may be read multiple times and it may also be read again when
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enabling languages later (see below).
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* Set the variables describing the host and target platforms.
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Language-specific variables might or might not be set at this point.
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On the first run, the only language-specific variables that might be
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defined are those a toolchain file may have set. On subsequent runs,
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language-specific variables cached from a previous run may be set.
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* .. versionadded:: 3.24
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Include each file listed in :variable:`CMAKE_PROJECT_TOP_LEVEL_INCLUDES`,
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if set. The variable is ignored by CMake thereafter.
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* Enable any languages specified in the call, or the default languages if
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none were provided. The toolchain file may be re-read when enabling a
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language for the first time.
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* .. versionadded:: 3.15
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For every ``project()`` call regardless of the project
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name, include the file(s) and module(s) named by
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:variable:`CMAKE_PROJECT_INCLUDE`, if set.
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* If the ``project()`` command specifies ``<PROJECT-NAME>`` as its project
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name, include the file(s) and module(s) named by
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:variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE`, if set.
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Usage
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^^^^^
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The top-level ``CMakeLists.txt`` file for a project must contain a
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literal, direct call to the ``project()`` command; loading one
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through the :command:`include` command is not sufficient. If no such
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call exists, CMake will issue a warning and pretend there is a
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``project(Project)`` at the top to enable the default languages
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(``C`` and ``CXX``).
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.. note::
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Call the ``project()`` command near the top of the top-level
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``CMakeLists.txt``, but *after* calling :command:`cmake_minimum_required`.
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It is important to establish version and policy settings before invoking
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other commands whose behavior they may affect and for this reason the
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``project()`` command will issue a warning if this order is not kept.
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See also policy :policy:`CMP0000`.
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