CMake 3.22 Release Notes
************************

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Changes made since CMake 3.21 include the following.

New Features
============

Commands
--------

* The :command:`cmake_host_system_information` command can now query
  `OS identification variables`_ from the :file:`/etc/os-release` file.

* The :command:`string(TIMESTAMP)` command now supports the ``%V``
  specifier for ISO 8601 week numbers.

.. _`OS identification variables`: https://www.freedesktop.org/software/systemd/man/os-release.html

Variables
---------

* The :envvar:`CMAKE_BUILD_TYPE` environment variable was added to
  provide a default value for the :variable:`CMAKE_BUILD_TYPE` variable.

* The :envvar:`CMAKE_CONFIGURATION_TYPES` environment variable was added to
  provide a default value for the :variable:`CMAKE_CONFIGURATION_TYPES`
  variable.

* The :envvar:`CMAKE_INSTALL_MODE` environment variable was added to
  tell :command:`install` rules (implemented by :command:`file(INSTALL)`)
  to install symbolic links instead of copying of files.

* The :variable:`CMAKE_<LANG>_LINK_WHAT_YOU_USE_FLAG` and
  :variable:`CMAKE_LINK_WHAT_YOU_USE_CHECK` variables were added to
  control the linker flag and check used by the
  :prop_tgt:`LINK_WHAT_YOU_USE` target property.

* The :variable:`CMAKE_REQUIRE_FIND_PACKAGE_<PackageName>` variable
  was added to turn a non-REQUIRED :command:`find_package` call into
  a REQUIRED one.

Properties
----------

* The :prop_tgt:`<LANG>_EXTENSIONS` target property is now initialized to
  :variable:`CMAKE_<LANG>_EXTENSIONS_DEFAULT`, detected from the compiler.
  See :policy:`CMP0128`.

* The :prop_sf:`VS_SETTINGS` source file property is now supported for
  all source file types.  Previously it worked only for non-built sources.

Modules
-------

* The :module:`CMakeDependentOption` module :command:`cmake_dependent_option`
  macro now supports full :ref:`Condition Syntax`.
  See policy :policy:`CMP0127`.

* The :module:`FetchContent` module now passes through the
  :variable:`CMAKE_TLS_VERIFY`, :variable:`CMAKE_TLS_CAINFO`,
  :variable:`CMAKE_NETRC` and :variable:`CMAKE_NETRC_FILE` variables (when
  defined) to the underlying :module:`ExternalProject` sub-build.
  Previously, those variables were silently ignored by :module:`FetchContent`.

* The :module:`FindBLAS` and :module:`FindLAPACK` modules gained
  a ``BLA_SIZEOF_INTEGER`` option to find a BLAS/LAPACK whose ABI
  uses a specific integer size.

* The :module:`FindJasper` module now provides an imported target.

* The :module:`FindMatlab` module now provides imported targets.

* The :module:`FindPkgConfig` module gained a :variable:`PKG_CONFIG_ARGN`
  variable to specify arguments to ``pkg-config`` calls.

* The :module:`GoogleTest` module :command:`gtest_discover_tests`
  function gained a ``TEST_FILTER`` option to filter tests using
  ``--gtest_filter`` during test discovery.

* The :module:`UseSWIG` module, for :ref:`Visual Studio Generators`,
  can now use the ``swig`` tool to generate implicit dependencies.

CTest
-----

* :manual:`ctest(1)` learned to recognize labels attached to a test at run time.
  Previously it was only possible to attach labels to tests at configure time
  by using the :prop_test:`LABELS` test property.
  See :ref:`Additional Test Measurements` for more information.

* :manual:`ctest(1)` learned to be able to modify the environment for a test
  through the :prop_test:`ENVIRONMENT_MODIFICATION` property. This is allows
  for updates to environment variables based on the environment present at
  test time.

* The :command:`ctest_memcheck` command now also generates a
  :file:`DynamicAnalysis-Test.xml` file which may be used to submit test
  results to CDash.

CPack
-----

* The :cpack_gen:`CPack DEB Generator` gained the
  option to set :variable:`CPACK_DEBIAN_COMPRESSION_TYPE` to ``zstd``,
  which enables Zstandard compression for deb packages.

* The :cpack_gen:`CPack NSIS Generator` gained a new
  :variable:`CPACK_NSIS_IGNORE_LICENSE_PAGE` variable to suppress
  the license page in the installer.

* The :cpack_gen:`CPack RPM Generator` gained the
  :variable:`CPACK_RPM_REQUIRES_EXCLUDE_FROM` option to avoid scanning
  specific paths for dependencies.

Deprecated and Removed Features
===============================

* The :generator:`Visual Studio 10 2010` generator is now deprecated
  and will be removed in a future version of CMake.

Other Changes
=============

* The :manual:`Compile Features <cmake-compile-features(7)>` functionality now
  correctly disables or enables compiler extensions when no standard level is
  specified and avoids unnecessarily adding language standard flags if the
  requested settings match the compiler's defaults. See :policy:`CMP0128`.

* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
  now ignores features for languages that are not enabled.

* The :ref:`Ninja Generators` now implement the ``edit_cache`` target
  using :manual:`ccmake(1)` if available.

* The :generator:`Ninja` and :generator:`NMake Makefiles` generators
  now use the MSVC ``-external:I`` flag for system includes.
  This became available as of VS 16.10 (toolchain version 14.29.30037).

* The :cpack_gen:`CPack NSIS Generator` now requires NSIS 3.03 or later.

3.22.1
------

This version made no changes to documented features or interfaces.
Some implementation updates were made to support ecosystem changes
and/or fix regressions.

3.22.2
------

* The ``OLD`` behavior of :policy:`CMP0128` was fixed to add flags even when
  the specified standard matches the compiler default.
