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 :generator:`Visual Studio 17 2022` generator was added. This is experimental and based on "Visual Studio 2022 Preview 1.1" because this version of VS has not been released. * 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__LINKER_LAUNCHER` variable and :prop_tgt:`_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 ` 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 `` command-line option to specify the location of the install prefix. * :manual:`cmake(1)` gained the ``--toolchain `` command-line option to specify a toolchain file. * :manual:`cmake(1)` ``-E capabilities`` output, for some generators, may now contain 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 `, * 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 `) 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:`_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 >` 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 >`, :prop_tgt:`XCODE_EMBED_APP_EXTENSIONS_CODE_SIGN_ON_COPY _CODE_SIGN_ON_COPY>` and :prop_tgt:`XCODE_EMBED_APP_EXTENSIONS_REMOVE_HEADERS_ON_COPY _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 `, 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 \$\` 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 `_ now support ``liblzma`` multi-threading. See the :variable:`CPACK_THREADS` and :variable:`CPACK_ARCHIVE_THREADS` variables.