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364 lines
14 KiB
364 lines
14 KiB
CMake 3.18 Release Notes
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************************
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.. only:: html
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.. contents::
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Changes made since CMake 3.17 include the following.
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New Features
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============
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Languages
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---------
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* The ``CUDA`` language can now be compiled using Clang on non-Windows
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platforms. Separable compilation is not yet supported on any platform.
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Command-Line
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------------
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* :manual:`cmake(1)` gained support for profiling of CMake scripts through
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the parameters ``--profiling-output`` and ``--profiling-format``.
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* :manual:`cmake(1)` gained a ``cat`` command line
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option that can be used to concatenate files and print them
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on standard output.
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Commands
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--------
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* The :command:`add_library` and :command:`add_executable` commands
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learned to create :ref:`Alias Targets` referencing non-``GLOBAL``
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:ref:`Imported Targets`.
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* The :command:`cmake_language()` command was added for meta-operations on
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scripted or built-in commands, starting with a mode to ``CALL`` other
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commands, and ``EVAL CODE`` to inplace evaluate a CMake script.
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* The :command:`execute_process` command gained the ``ECHO_OUTPUT_VARIABLE``
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and ``ECHO_ERROR_VARIABLE`` options.
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* The :command:`export` command now raise an error if used multiple times with
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same ``FILE`` without ``APPEND``. See policy :policy:`CMP0103`.
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* The :command:`file` command gained the ``ARCHIVE_CREATE`` and
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``ARCHIVE_EXTRACT`` subcommands to expose the :manual:`cmake(1)` ``-E tar``
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functionality to CMake scripting code.
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* The :command:`file(CONFIGURE)` subcommand was created in order to replicate
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the :command:`configure_file` functionality without resorting to a
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pre-existing file on disk as input. The content is instead passed as a
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string.
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* The :command:`file(UPLOAD)` command gained ``TLS_VERIFY`` and ``TLS_CAINFO``
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options to control server certificate verification.
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* The :command:`find_program`, :command:`find_library`, :command:`find_path`
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and :command:`find_file` commands gained a new ``REQUIRED`` option that will
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stop processing with an error message if nothing is found.
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* The :command:`get_property` command with ``SOURCE`` scope gained the
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``DIRECTORY`` and ``TARGET_DIRECTORY`` options to get a property
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from the provided directory scope.
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* The :command:`get_source_file_property` command gained the ``DIRECTORY``
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and ``TARGET_DIRECTORY`` options to get a property from the
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provided directory scope.
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* The :command:`list` operation ``SORT`` gained the ``NATURAL`` sort
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option to sort using natural order (see ``strverscmp(3)`` manual).
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* The :command:`set_property` command with the ``SOURCE`` scope gained the
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``DIRECTORY`` and ``TARGET_DIRECTORY`` options to set properties
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in the provided directory scopes.
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* The :command:`set_source_files_properties` command gained the ``DIRECTORY``
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and ``TARGET_DIRECTORY`` options to set properties in the provided
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directory scopes.
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* The :command:`string` command learned a new ``HEX`` sub-command, which
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converts strings into their hexadecimal representation.
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Variables
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---------
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* A :variable:`CMAKE_CUDA_ARCHITECTURES` variable was added to specify
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CUDA output architectures. Users are encouraged to use this instead of
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specifying options manually, as this approach is compiler-agnostic.
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The variable is initialized automatically when
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:variable:`CMAKE_CUDA_COMPILER_ID <CMAKE_<LANG>_COMPILER_ID>` is ``NVIDIA``.
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The variable is used to initialize the new :prop_tgt:`CUDA_ARCHITECTURES`
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target property. See policy :policy:`CMP0104`.
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* The :variable:`CMAKE_PCH_WARN_INVALID` variable was added to initialize the
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:prop_tgt:`PCH_WARN_INVALID` target property to allow the removal of the
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precompiled header invalid warning.
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Properties
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----------
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* The :prop_tgt:`CUDA_ARCHITECTURES` target property was added to specify
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CUDA output architectures. Users are encouraged to use this instead of
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specifying options manually, as this approach is compiler-agnostic.
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The property is initialized by the new :variable:`CMAKE_CUDA_ARCHITECTURES`
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variable. See policy :policy:`CMP0104`.
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* The :prop_tgt:`Fortran_PREPROCESS` target property and
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:prop_sf:`Fortran_PREPROCESS` source-file property were added to
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control preprocessing of Fortran source files.
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* The :prop_tgt:`FRAMEWORK_MULTI_CONFIG_POSTFIX_<CONFIG>` target property
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and associated :variable:`CMAKE_FRAMEWORK_MULTI_CONFIG_POSTFIX_<CONFIG>`
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variable were created to allow adding a postfix to the name of a
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framework file name when using a multi-config generator.
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* The :prop_sf:`OBJECT_OUTPUTS` source file property now supports
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:manual:`generator expressions <cmake-generator-expressions(7)>`.
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* The :prop_tgt:`PCH_WARN_INVALID` target property was added to allow the
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removal of the precompiled header invalid warning.
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* The :prop_tgt:`UNITY_BUILD_MODE` target property was added to tell
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generators which algorithm to use for grouping included source
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files.
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* The :prop_tgt:`VS_SOURCE_SETTINGS_<tool>` target property was added
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to tell :ref:`Visual Studio Generators` for VS 2010 and above to add
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metadata to non-built source files using ``<tool>``.
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* The :prop_sf:`VS_SETTINGS` source file property was added to tell
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:ref:`Visual Studio Generators` for VS 2010 and above to add
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metadata to a non-built source file.
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* The :prop_tgt:`VS_PLATFORM_TOOLSET` target property was added to tell
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:ref:`Visual Studio Generators` for VS 2010 and above to override
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the platform toolset.
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* The :prop_tgt:`VS_SOLUTION_DEPLOY` target property was added to tell
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:ref:`Visual Studio Generators` for VS 2010 and above to mark a
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target for deployment even when not building for Windows Phone/Store/CE.
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Modules
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-------
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* The :module:`CheckLinkerFlag` module has been added to provide a
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facility to check validity of link flags.
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* The :module:`ExternalProject` module :command:`ExternalProject_Add` command
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gained a new ``GIT_REMOTE_UPDATE_STRATEGY`` keyword. This can be used to
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specify how failed rebase operations during a git update should be handled.
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The ``CMAKE_EP_GIT_REMOTE_UPDATE_STRATEGY`` variable was also added as a
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global default and is honored by both the :module:`ExternalProject` and
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:module:`FetchContent` modules.
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* The :module:`FetchContent` module :command:`FetchContent_Declare` command
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now supports a ``SOURCE_SUBDIR`` option. It can be used to direct
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:command:`FetchContent_MakeAvailable` to look in a different location
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for the ``CMakeLists.txt`` file.
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* The :module:`FindBLAS` module now provides an imported target.
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* The :module:`FindCUDAToolkit` module:
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* gained the variable
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``CUDAToolkit_LIBRARY_ROOT``, which is the directory containing the
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``nvvm`` directory and ``version.txt``.
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* uses toolkit and library root found during ``CUDA`` compiler detection.
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* The :module:`FindLAPACK` module now provides an imported target.
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* The :module:`FindPython3`, :module:`FindPython2` and :module:`FindPython`
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modules:
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* gained the possibility to create per-artifact cache variables for
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interactive editing in :manual:`cmake-gui(1)` and :manual:`ccmake(1)`.
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* gained sub-components ``Development.Module`` and
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``Development.Embed`` under the ``Development`` component.
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* gained the capability to specify which Python implementations to find,
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including ``IronPython`` and ``PyPy``.
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* The :module:`FindRuby` module input and output variables were all renamed
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from ``RUBY_`` to ``Ruby_`` for consistency with other find modules.
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Input variables of the old case will be honored if provided, and output
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variables of the old case are always provided.
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* The :module:`FindSWIG` module now accepts target languages as ``COMPONENTS``
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and ``OPTIONAL_COMPONENTS`` arguments to ``find_package``.
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* The :module:`GoogleTest` module :command:`gtest_discover_tests` command:
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* gained a new ``DISCOVERY_MODE`` option to control when the test
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discovery step is run. It offers a new ``PRE_TEST`` setting to
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run the discovery at test time instead of build time. A new
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``CMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE`` variable can be used
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to change the default globally.
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* gained a new optional parameter ``XML_OUTPUT_DIR``. When set the
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JUnit XML test results are stored in that directory.
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* The :module:`FindLibXslt` module now provides imported targets.
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* The :module:`UseSWIG` module now supports Fortran as a target language if
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the ``SWIG_EXECUTABLE`` is SWIG-Fortran_.
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.. _`SWIG-Fortran`: https://github.com/swig-fortran/swig
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Generator Expressions
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---------------------
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* The :genex:`$<DEVICE_LINK:...>` and :genex:`$<HOST_LINK:...>`
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generator expressions were added to manage device and host link steps.
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* The :genex:`$<LINK_LANGUAGE:...>` and :genex:`$<LINK_LANG_AND_ID:...>`
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generator expressions were added.
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CTest
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-----
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* :manual:`ctest(1)` gained a new :variable:`CTEST_RESOURCE_SPEC_FILE`
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variable, which can be used to specify a
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:ref:`resource specification file <ctest-resource-specification-file>`.
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* :manual:`ctest(1)` gained a ``--stop-on-failure`` option,
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which can be used to stop running the tests once one has failed.
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* The :command:`ctest_test` command gained a ``STOP_ON_FAILURE`` option
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which can be used to stop running the tests once one has failed.
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* The :module:`CTestCoverageCollectGCOV` module
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:command:`ctest_coverage_collect_gcov` command gained a
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``TARBALL_COMPRESSION`` option to control compression of the
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tarball of collected results.
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CPack
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-----
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* The :cpack_gen:`CPack Archive Generator`'s ``TXZ`` format learned the
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:variable:`CPACK_ARCHIVE_THREADS` variable to enable parallel compression.
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Requires support in the ``liblzma`` used by CMake.
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* The :cpack_gen:`CPack NSIS Generator` gained a new variable
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:variable:`CPACK_NSIS_MANIFEST_DPI_AWARE` to declare that the
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installer is DPI-aware.
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* The :cpack_gen:`CPack RPM Generator` gained
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:variable:`CPACK_RPM_PRE_TRANS_SCRIPT_FILE` and
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:variable:`CPACK_RPM_POST_TRANS_SCRIPT_FILE`
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variables to specify pre- and post-transaction scripts.
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Other
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-----
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* :manual:`cmake-gui(1)` now populates its generator selection
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widget default value from the :envvar:`CMAKE_GENERATOR` environment
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variable. Additionally, environment variables
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:envvar:`CMAKE_GENERATOR_PLATFORM` and :envvar:`CMAKE_GENERATOR_TOOLSET`
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are used to populate their respective widget defaults.
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* :manual:`ccmake(1)` learned to read a :envvar:`CCMAKE_COLORS`
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environment variable to customize colors.
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* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
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is now aware of the availability of C11 features in MSVC 19.27 and 19.28,
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including support for the ``c_restrict``, ``c_static_assert`` features and
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the ``-std:c11`` flag.
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Deprecated and Removed Features
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===============================
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* The :module:`Documentation` module has been deprecated via
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:policy:`CMP0106`. This module was essentially VTK code that CMake should
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not be shipping anymore.
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* An explicit deprecation diagnostic was added for policy ``CMP0070``
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and policy ``CMP0071`` (``CMP0069`` and below were already deprecated).
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The :manual:`cmake-policies(7)` manual explains that the OLD behaviors
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of all policies are deprecated and that projects should port to the
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NEW behaviors.
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Other Changes
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=============
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* On Windows, the :generator:`Ninja` and :generator:`Ninja Multi-Config`
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generators, when a compiler is not explicitly specified, now select
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the first compiler (of any name) found in directories listed by the
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``PATH`` environment variable.
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* The :prop_tgt:`LINK_OPTIONS` and :prop_tgt:`INTERFACE_LINK_OPTIONS` target
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properties are now used for the device link step.
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See policy :policy:`CMP0105`.
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* Creation of an ``ALIAS`` target overwriting an existing target now raises an
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error. See policy :policy:`CMP0107`.
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* Linking a target to itself through an alias now raises an error.
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See policy :policy:`CMP0108`.
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* The :module:`FindPackageHandleStandardArgs` module option ``REQUIRED_VARS``
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is now optional if ``HANDLE_COMPONENTS`` is specified.
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* The :command:`source_group` command now also recognizes forward slashes
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as subgroup delimiters, not just backslashes.
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* :manual:`ctest(1)` now logs environment variables that it sets for each test,
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either due to the :prop_test:`ENVIRONMENT` property or the
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:ref:`resource allocation <ctest-resource-allocation>` feature, and submits
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this log to CDash. It does not log environment variables that were set
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outside of CTest.
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* When building CMake itself from source and not using a system-provided
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libcurl, HTTP/2 support is now enabled for commands supporting
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network communication via ``http(s)``, such as :command:`file(DOWNLOAD)`,
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:command:`file(UPLOAD)`, and :command:`ctest_submit`.
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The precompiled binaries provided on ``cmake.org`` now support HTTP/2.
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* The :manual:`cmake-file-api(7)` "codemodel" version 2 ``version`` field has
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been updated to 2.1.
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* The :manual:`cmake-file-api(7)` "codemodel" version 2 "target" object gained
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a new ``precompileHeaders`` field in the ``compileGroups`` objects.
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Updates
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=======
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Changes made since CMake 3.18.0 include the following.
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3.18.1
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------
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* The :generator:`Xcode` generator, when :variable:`CMAKE_OSX_ARCHITECTURES`
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is not defined, now selects ``$(NATIVE_ARCH_ACTUAL)`` as the default
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architecture (the Xcode ``ARCHS`` setting). This is needed for Xcode 12
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to select the host's architecture, which older versions of Xcode did
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by default.
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* In CMake 3.18.0 the :command:`add_test` command learned to support
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special characters in test names. This was accidentally left out of
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its release notes. Unfortunately the fix breaks existing projects
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that were using manual quoting or escaping to work around the prior
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limitation. This fix has been reverted in 3.18.1, but may be
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re-introduced in future versions of CMake with a policy for compatibility.
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3.18.2
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------
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* The default value of :variable:`CMAKE_AUTOMOC_PATH_PREFIX` was changed to
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``OFF`` because this feature can break existing projects that have
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identically named header files in different include directories.
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This restores compatibility with behavior of CMake 3.15 and below.
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The default was also changed to ``OFF`` in 3.16.9 and 3.17.5.
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* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
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was updated for MSVC 19.27 as mentioned above (``c_restrict``).
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3.18.3
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------
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* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
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was updated for MSVC 19.28 as mentioned above (``c_static_assert``).
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