mirror of
https://github.com/Kitware/CMake.git
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86759dce81
Propagates variables set in enable_language() logic up variable scopes so that the language can be used by targets in the ancestor directories. Works through block() and function() scopes as well. The add_subdirectory() call can be thought of as the effective call site for enabling the language. The same holds for endblock() and the actual function call. Adds a policy CMP0220 to control this behavior. As the language is "enabled" at each ancestor scope, the policy is checked. If OLD, the language is not enabled at this scope and the ones above. Closes: #27881 #27508 #27389 Related: #26751 #27564
CMake
*****
Introduction
============
CMake is a cross-platform, open-source build system generator.
For full documentation visit the `CMake Home Page`_ and the
`CMake Documentation Page`_. The `CMake Community Wiki`_ also
references useful guides and recipes.
.. _`CMake Home Page`: https://cmake.org
.. _`CMake Documentation Page`: https://cmake.org/documentation
.. _`CMake Community Wiki`: https://gitlab.kitware.com/cmake/community/-/wikis/home
CMake is maintained and supported by `Kitware`_ and developed in
collaboration with a productive community of contributors.
.. _`Kitware`: https://www.kitware.com/cmake
License
=======
CMake is distributed under the OSI-approved BSD 3-clause License.
See `LICENSE.rst`_ for details.
.. _`LICENSE.rst`: LICENSE.rst
Building CMake
==============
Supported Platforms
-------------------
* Microsoft Windows
* Apple macOS
* Linux
* FreeBSD
* OpenBSD
* Solaris
* AIX
Other UNIX-like operating systems may work too out of the box, if not
it should not be a major problem to port CMake to this platform.
Please post to the `CMake Discourse Forum`_ to ask if others have
had experience with the platform.
.. _`CMake Discourse Forum`: https://discourse.cmake.org
Building CMake with CMake
-------------------------
You can build CMake as any other project with a CMake-based build system:
run an already-installed CMake on this source tree with your preferred
generator and options. Then build it and install it.
To build the documentation, install `Sphinx`_ and configure CMake with
``-DSPHINX_HTML=ON`` and/or ``-DSPHINX_MAN=ON`` to enable the "html" or
"man" builder. Add ``-DSPHINX_EXECUTABLE=/path/to/sphinx-build`` if the
tool is not found automatically.
To run the test suite, run ``ctest`` in the CMake build directory after
building. See the `CMake Testing Guide`_ for details.
.. _`Sphinx`: https://sphinx-doc.org
.. _`CMake Testing Guide`: Help/dev/testing.rst
Building CMake from Scratch
---------------------------
UNIX/Mac OSX/MinGW/MSYS/Cygwin
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
You need to have a C++ compiler (supporting C++11) and a ``make`` installed.
Run the ``bootstrap`` script you find in the source directory of CMake.
You can use the ``--help`` option to see the supported options.
You may use the ``--prefix=<install_prefix>`` option to specify a custom
installation directory for CMake. Once this has finished successfully,
run ``make`` and ``make install``.
For example, if you simply want to build and install CMake from source,
you can build directly in the source tree::
$ ./bootstrap && make && sudo make install
Or, if you plan to develop CMake or otherwise run the test suite, create
a separate build tree::
$ mkdir build && cd build
$ ../bootstrap && make
By default the ``bootstrap`` script configures CMake to build with vendored
dependencies. However, CMake does not vendor OpenSSL. To bootstrap in a
minimal environment, disable use of OpenSSL::
$ ./bootstrap -- -DCMAKE_USE_OPENSSL=OFF
Windows
^^^^^^^
There are two ways for building CMake under Windows:
1. Compile with MSVC from VS 2015 or later.
You need to download and install a binary release of CMake. You can get
these releases from the `CMake Download Page`_. Then proceed with the
instructions above for `Building CMake with CMake`_.
2. Bootstrap with MinGW under MSYS2.
Download and install `MSYS2`_. Then install the required build tools::
$ pacman -S --needed git base-devel mingw-w64-x86_64-gcc
and bootstrap as above.
.. _`CMake Download Page`: https://cmake.org/download
.. _`MSYS2`: https://www.msys2.org/
Reporting Bugs
==============
If you have found a bug:
1. If you have a patch, please read the `CONTRIBUTING.rst`_ document.
2. Otherwise, please post to the `CMake Discourse Forum`_ and ask about
the expected and observed behaviors to determine if it is really
a bug.
3. Finally, if the issue is not resolved by the above steps, open
an entry in the `CMake Issue Tracker`_.
.. _`CMake Issue Tracker`: https://gitlab.kitware.com/cmake/cmake/-/issues
Contributing
============
See `CONTRIBUTING.rst`_ for instructions to contribute.
.. _`CONTRIBUTING.rst`: CONTRIBUTING.rst