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Diffstat (limited to 'Help/command/project.rst')
| -rw-r--r-- | Help/command/project.rst | 155 |
1 files changed, 108 insertions, 47 deletions
diff --git a/Help/command/project.rst b/Help/command/project.rst index 139f69c9b..395145619 100644 --- a/Help/command/project.rst +++ b/Help/command/project.rst @@ -1,69 +1,130 @@ project ------- -Set a name, version, and enable languages for the entire project. +Set the name of the project. + +Synopsis +^^^^^^^^ .. code-block:: cmake - project(<PROJECT-NAME> [LANGUAGES] [<language-name>...]) + project(<PROJECT-NAME> [<language-name>...]) project(<PROJECT-NAME> [VERSION <major>[.<minor>[.<patch>[.<tweak>]]]] [DESCRIPTION <project-description-string>] + [HOMEPAGE_URL <url-string>] [LANGUAGES <language-name>...]) -Sets the name of the project and stores the name in the -:variable:`PROJECT_NAME` variable. Additionally this sets variables +Sets the name of the project, and stores it in the variable +:variable:`PROJECT_NAME`. When called from the top-level +``CMakeLists.txt`` also stores the project name in the +variable :variable:`CMAKE_PROJECT_NAME`. + +Also sets the variables * :variable:`PROJECT_SOURCE_DIR`, :variable:`<PROJECT-NAME>_SOURCE_DIR` * :variable:`PROJECT_BINARY_DIR`, :variable:`<PROJECT-NAME>_BINARY_DIR` -If ``VERSION`` is specified, given components must be non-negative integers. -If ``VERSION`` is not specified, the default version is the empty string. -The ``VERSION`` option may not be used unless policy :policy:`CMP0048` is -set to ``NEW``. - -The :command:`project()` command stores the version number and its components -in variables - -* :variable:`PROJECT_VERSION`, - :variable:`<PROJECT-NAME>_VERSION` -* :variable:`PROJECT_VERSION_MAJOR`, - :variable:`<PROJECT-NAME>_VERSION_MAJOR` -* :variable:`PROJECT_VERSION_MINOR`, - :variable:`<PROJECT-NAME>_VERSION_MINOR` -* :variable:`PROJECT_VERSION_PATCH`, - :variable:`<PROJECT-NAME>_VERSION_PATCH` -* :variable:`PROJECT_VERSION_TWEAK`, - :variable:`<PROJECT-NAME>_VERSION_TWEAK` - -Variables corresponding to unspecified versions are set to the empty string -(if policy :policy:`CMP0048` is set to ``NEW``). - -If optional ``DESCRIPTION`` is given, then additional :variable:`PROJECT_DESCRIPTION` -variable will be set to its argument. The argument must be a string with short -description of the project (only a few words). - -Optionally you can specify which languages your project supports. -Example languages are ``C``, ``CXX`` (i.e. C++), ``Fortran``, etc. -By default ``C`` and ``CXX`` are enabled if no language options are -given. Specify language ``NONE``, or use the ``LANGUAGES`` keyword -and list no languages, to skip enabling any languages. - -If a variable exists called :variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE`, -the file pointed to by that variable will be included as the last step of the -project command. +Further variables are set by the optional arguments described in the following. +If any of these arguments is not used, then the corresponding variables are +set to the empty string. + +Options +^^^^^^^ + +The options are: + +``VERSION <version>`` + Optional; may not be used unless policy :policy:`CMP0048` is + set to ``NEW``. + + Takes a ``<version>`` argument composed of non-negative integer components, + i.e. ``<major>[.<minor>[.<patch>[.<tweak>]]]``, + and sets the variables + + * :variable:`PROJECT_VERSION`, + :variable:`<PROJECT-NAME>_VERSION` + * :variable:`PROJECT_VERSION_MAJOR`, + :variable:`<PROJECT-NAME>_VERSION_MAJOR` + * :variable:`PROJECT_VERSION_MINOR`, + :variable:`<PROJECT-NAME>_VERSION_MINOR` + * :variable:`PROJECT_VERSION_PATCH`, + :variable:`<PROJECT-NAME>_VERSION_PATCH` + * :variable:`PROJECT_VERSION_TWEAK`, + :variable:`<PROJECT-NAME>_VERSION_TWEAK`. + + When the ``project()`` command is called from the top-level ``CMakeLists.txt``, + then the version is also stored in the variable :variable:`CMAKE_PROJECT_VERSION`. + +``DESCRIPTION <project-description-string>`` + Optional. + Sets the variables + + * :variable:`PROJECT_DESCRIPTION`, :variable:`<PROJECT-NAME>_DESCRIPTION` + + to ``<project-description-string>``. + It is recommended that this description is a relatively short string, + usually no more than a few words. + + When the ``project()`` command is called from the top-level ``CMakeLists.txt``, + then the description is also stored in the variable :variable:`CMAKE_PROJECT_DESCRIPTION`. + +``HOMEPAGE_URL <url-string>`` + Optional. + Sets the variables + + * :variable:`PROJECT_HOMEPAGE_URL`, :variable:`<PROJECT-NAME>_HOMEPAGE_URL` + + to ``<url-string>``, which should be the canonical home URL for the project. + + When the ``project()`` command is called from the top-level ``CMakeLists.txt``, + then the URL also is stored in the variable :variable:`CMAKE_PROJECT_HOMEPAGE_URL`. + +``LANGUAGES <language-name>...`` + Optional. + Can also be specified without ``LANGUAGES`` keyword per the first, short signature. + + Selects which programming languages are needed to build the project. + Supported languages include ``C``, ``CXX`` (i.e. C++), ``CUDA``, + ``OBJC`` (i.e. Objective-C), ``OBJCXX``, ``Fortran``, and ``ASM``. + By default ``C`` and ``CXX`` are enabled if no language options are given. + Specify language ``NONE``, or use the ``LANGUAGES`` keyword and list no languages, + to skip enabling any languages. + + If enabling ``ASM``, list it last so that CMake can check whether + compilers for other languages like ``C`` work for assembly too. + +The variables set through the ``VERSION``, ``DESCRIPTION`` and ``HOMEPAGE_URL`` +options are intended for use as default values in package metadata and documentation. + +Code Injection +^^^^^^^^^^^^^^ + +If the :variable:`CMAKE_PROJECT_INCLUDE_BEFORE` variable is set, the file +pointed to by that variable will be included as the first step of the +``project()`` command. + +If the :variable:`CMAKE_PROJECT_INCLUDE` or +:variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE` variables are set, the files +they point to will be included as the last step of the ``project()`` command. +If both are set, then :variable:`CMAKE_PROJECT_INCLUDE` will be included before +:variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE`. + +Usage +^^^^^ The top-level ``CMakeLists.txt`` file for a project must contain a -literal, direct call to the :command:`project` command; loading one +literal, direct call to the ``project()`` command; loading one through the :command:`include` command is not sufficient. If no such -call exists CMake will implicitly add one to the top that enables the -default languages (``C`` and ``CXX``). +call exists, CMake will issue a warning and pretend there is a +``project(Project)`` at the top to enable the default languages +(``C`` and ``CXX``). .. note:: - Call the :command:`cmake_minimum_required` command at the beginning - of the top-level ``CMakeLists.txt`` file even before calling the - ``project()`` command. It is important to establish version and - policy settings before invoking other commands whose behavior they - may affect. See also policy :policy:`CMP0000`. + Call the ``project()`` command near the top of the top-level + ``CMakeLists.txt``, but *after* calling :command:`cmake_minimum_required`. + It is important to establish version and policy settings before invoking + other commands whose behavior they may affect. + See also policy :policy:`CMP0000`. |