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|
CMake 3.21 Release Notes
************************
.. only:: html
.. contents::
Changes made since CMake 3.20 include the following.
New Features
============
Presets
-------
* :manual:`cmake-presets(7)` gained support for specifying the install prefix
in a configure preset.
* :manual:`cmake-presets(7)` gained support for conditional enabling of presets.
* :manual:`cmake-presets(7)` gained support for a ``${hostSystemName}`` macro.
* :manual:`cmake-presets(7)` gained support for omitting the ``generator`` and
``binaryDir`` fields.
Generators
----------
* The :ref:`Makefile Generators` and the :generator:`Ninja` generator
learned to add linker launcher tools along with the linker for ``C``,
``CXX``, ``OBJC``, and ``OBJCXX`` languages.
See the :variable:`CMAKE_<LANG>_LINKER_LAUNCHER` variable
and :prop_tgt:`<LANG>_LINKER_LAUNCHER` target property for details.
Languages
---------
* CMake learned to support ``HIP`` as a first-class language that can be
enabled via the :command:`project` and :command:`enable_language` commands.
* :prop_tgt:`C_STANDARD`, :prop_tgt:`OBJC_STANDARD`, and the
:manual:`Compile Features <cmake-compile-features(7)>` functionality gained
support for C17 and C23.
* Source file extensions ``.ixx`` and ``.cppm`` are now treated as C++.
Command-Line
------------
* :manual:`cmake(1)` gained the ``--install-prefix <dir>``
command-line option to specify the location of the install prefix.
* :manual:`cmake(1)` gained the ``--toolchain <path/to/file>``
command-line option to specify a toolchain file.
* :manual:`cmake(1)` ``-E capabilities`` output now contains for each
generator a ``supportedPlatforms`` field listing platforms known to
be supported in :variable:`CMAKE_GENERATOR_PLATFORM`.
* Messages printed to a terminal now may be colored by message type.
Compilers
---------
* The Fujitsu compiler is now supported using compiler id ``Fujitsu``
in traditional (``Trad``) mode, and compiler id ``FujitsuClang``
in ``Clang`` mode.
Platforms
---------
* CMake now supports the MSYS runtime environment, much like CYGWIN.
File-Based API
--------------
* The :manual:`cmake-file-api(7)` "codemodel" version 2 ``version`` field
has been updated to 2.3.
* The :manual:`cmake-file-api(7)` "codemodel" version 2 gained a
new "directory" object containing directory-level information.
This includes a list of installers generated by the :command:`install`
command.
Commands
--------
* The :command:`add_custom_command` command ``DEPFILE`` option:
* may now use
:manual:`generator expressions <cmake-generator-expressions(7)>`,
* is now supported by :ref:`Visual Studio Generators` for VS 2012
and above, and
* is now supported by the :generator:`Xcode` generator.
* The :command:`add_custom_command(TARGET)` command
(for :ref:`Build Events <add_custom_command(TARGET)>`)
gained support for resolving target-dependent generator expressions.
* The :command:`build_command` command gained a ``PARALLEL_LEVEL`` option.
* The :command:`file(COPY_FILE)` command was added to copy a single file.
* The :command:`file(GET_RUNTIME_DEPENDENCIES)` command gained new
``POST_INCLUDE_FILES`` and ``POST_EXCLUDE_FILES`` arguments.
* The :command:`file(REAL_PATH)` command gained the option ``EXPAND_TILDE`` to
replace any leading tilde with the path to the user's home directory.
* The :command:`file(RENAME)` command learned to optionally capture
failure in a result variable. It also gained a ``NO_REPLACE``
option to fail if the destination exists.
* The :command:`install` command gained a new ``IMPORTED_RUNTIME_ARTIFACTS``
mode, which can be used to install the runtime artifacts of imported targets.
* The :command:`install` command gained a new ``RUNTIME_DEPENDENCY_SET`` mode,
which can be used to install runtime dependencies using
:command:`file(GET_RUNTIME_DEPENDENCIES)`.
* The :command:`install(TARGETS)` command gained new ``RUNTIME_DEPENDENCIES``
and ``RUNTIME_DEPENDENCY_SET`` arguments, which can be used to install
runtime dependencies using :command:`file(GET_RUNTIME_DEPENDENCIES)`.
* The :command:`install(SCRIPT|CODE)` command
supports a new option ``ALL_COMPONENTS`` which allows
the corresponding code to run for every component of
a per component installation.
* The :command:`project` command now sets variables
:variable:`PROJECT_IS_TOP_LEVEL` and :variable:`<PROJECT-NAME>_IS_TOP_LEVEL`
to indicate whether it was called in a top-level ``CMakeLists.txt`` file.
Variables
---------
* The :envvar:`CMAKE_TOOLCHAIN_FILE` environment variable was added to
provide a default value for the :variable:`CMAKE_TOOLCHAIN_FILE` variable.
Properties
----------
* The :prop_dir:`IMPORTED_TARGETS` directory property was added to
get a list of :ref:`Imported Targets` created in the current
directory.
* The :prop_tgt:`XCODE_EMBED_APP_EXTENSIONS <XCODE_EMBED_<type>>` target property
was added to tell the :generator:`Xcode` generator to embed app extensions
such as iMessage sticker packs.
Aspects of the embedding can be customized with the
:prop_tgt:`XCODE_EMBED_APP_EXTENSIONS_PATH <XCODE_EMBED_<type>>`,
:prop_tgt:`XCODE_EMBED_APP_EXTENSIONS_CODE_SIGN_ON_COPY <XCODE_EMBED_<type>_CODE_SIGN_ON_COPY>` and
:prop_tgt:`XCODE_EMBED_APP_EXTENSIONS_REMOVE_HEADERS_ON_COPY <XCODE_EMBED_<type>_REMOVE_HEADERS_ON_COPY>`
properties.
Modules
-------
* The :module:`FindBLAS` and :module:`FindLAPACK` modules learned to support
the serial ``Fujitsu_SSL2`` and parallel ``Fujitsu_SSL2BLAMP`` libraries.
* The :module:`FindDevIL` module now provides imported targets.
* The :module:`FindIconv` module now has version support.
* The :module:`FindIntl` module now has version support.
* The :module:`FindMPI` module learned to support ``Fujitsu`` and
``FujitsuClang`` in both host and cross compiling modes.
* The :module:`FindMsys` module was added to find MSYS installations.
Like :module:`FindCygwin`, it is used automatically by some other
find modules to locate UNIX-style tools on Windows.
* The :module:`FindOpenMP` module learned to support ``Fujitsu`` and
``FujitsuClang``.
* The :module:`FindVulkan` module gained imported targets
``Vulkan::Headers`` and ``Vulkan::glslangValidator``.
* The :module:`UseJava` module command ``add_jar`` gained a ``RESOURCES``
option to allow explicit naming of resources with non-optional namespace.
* The :module:`UseSWIG` module use now standard library naming conventions
for the ``CSharp`` language. See policy :policy:`CMP0122`.
* The :module:`UseSWIG` module now supports using the ``swig`` tool to
generate implicit dependencies with the :generator:`Xcode` generator.
Generator Expressions
---------------------
* A new :genex:`TARGET_RUNTIME_DLLS` generator expression was added.
CTest
-----
* :manual:`ctest(1)` gained documentation for its ability to capture
:ref:`Additional Test Measurements`.
* :manual:`ctest(1)` learned to recognize files attached to a test at run time.
Previously it was only possible to attach files to tests at configure time
by using the :prop_test:`ATTACHED_FILES` or
:prop_test:`ATTACHED_FILES_ON_FAIL` test properties.
See :ref:`Additional Test Measurements` for more information.
* :manual:`ctest(1)` gained a ``--output-junit`` option to write test results
to a JUnit XML file.
* The :command:`ctest_build` command gained a ``PARALLEL_LEVEL`` option.
CPack
-----
* The :cpack_gen:`CPack DragNDrop Generator` gained option
:variable:`CPACK_DMG_FILESYSTEM` to control the ``.dmg`` filesystem.
* The :cpack_gen:`CPack IFW Generator` now supports hyphens in names
given to :command:`cpack_ifw_configure_component` or
:command:`cpack_ifw_configure_component_group` as ``DEPENDS`` or
``DEPENDENCIES`` arguments. This requires QtIFW 3.1 or later.
* The :cpack_gen:`CPack NSIS Generator` gained a new
:variable:`CPACK_NSIS_EXECUTABLE` variable to specify the ``makensis``
executable to use instead of the default one.
* The :variable:`CPACK_CUSTOM_INSTALL_VARIABLES` variable was added to set
variables in ``cmake_install.cmake`` script invocations made by CPack.
Deprecated and Removed Features
===============================
* Undocumented :variable:`CMAKE_SYSTEM_NAME` version-stripping behavior has
been removed entirely. If it is set by a ``-D`` flag or by a
:manual:`toolchain file <cmake-toolchains(7)>`, it is left unaltered,
even if it still contains a version number.
Similar :variable:`CMAKE_HOST_SYSTEM_NAME` version-stripping behavior,
also undocumented, has been moved earlier, before :command:`project` or
:command:`enable_language` is called.
* ``ARMClang`` cpu/arch compile and link flags are no longer added
automatically based on the :variable:`CMAKE_SYSTEM_PROCESSOR`
variable or the undocumented ``CMAKE_SYSTEM_ARCH`` variable.
They must be specified explicitly. See policy :policy:`CMP0123`.
Other Changes
=============
* The :command:`find_file`, :command:`find_path`, :command:`find_program`,
and :command:`find_library` commands handle cache variables in the same way
regardless how they are defined. See policy :policy:`CMP0125` for details.
* The :command:`find_file`, :command:`find_path`, :command:`find_program`,
and :command:`find_library` commands gained the option ``NO_CACHE`` to store
find result in normal variable.
* The :command:`foreach` command now isolates loop variables in the loop scope.
See policy :policy:`CMP0124` for details.
* The :command:`list` command's ``GET``, ``INSERT``, ``SUBLIST``, and
``REMOVE_AT`` subcommands now error with invalid (i.e., non-integer) values
are given as any of their index arguments based on the setting of policy
:policy:`CMP0121`.
* The :command:`set(CACHE)` command no longer removes a normal variable
of the same name, if any. See policy :policy:`CMP0126`.
* :command:`target_link_libraries` calls referencing object libraries
via the :genex:`TARGET_OBJECTS` generator expression now place the
object files before all libraries on the link line, regardless of
their specified order. See documentation on
:ref:`Linking Object Libraries via \$\<TARGET_OBJECTS\>` for details.
* The :ref:`Ninja Generators` now pass source files and include directories
to the compiler using absolute paths. This makes diagnostic messages and
debug symbols more consistent, and matches the :ref:`Makefile Generators`.
* The :generator:`NMake Makefiles` generator now encodes the generated
makefiles as UTF-8 with a BOM when using ``nmake`` from VS 9 or above.
* The :ref:`Visual Studio Generators` for VS 2010 and above now place
per-source preprocessor definitions after target-wide preprocssor
definitions. This makes VS consistent with the :ref:`Ninja Generators`
and the :ref:`Makefile Generators`.
* The precompiled binaries provided on
`cmake.org <https://cmake.org/download/>`_ now support
``liblzma`` multi-threading. See the :variable:`CPACK_THREADS` and
:variable:`CPACK_ARCHIVE_THREADS` variables.
|
