CMake 3.12 Release Notes ************************ .. only:: html .. contents:: Changes made since CMake 3.11 include the following. New Features ============ Generators ---------- * The :ref:`Visual Studio Generators` for VS 2017 learned to support a ``version=14.##`` option in the :variable:`CMAKE_GENERATOR_TOOLSET` value (e.g. via the :manual:`cmake(1)` ``-T`` option) to specify a toolset version number. Command-Line ------------ * The :manual:`cmake(1)` :ref:`Build Tool Mode` (``cmake --build``) gained ``--parallel []`` and ``-j []`` options to specify a parallel build level. They map to corresponding options of the native build tool. Commands -------- * The :command:`add_compile_definitions` command was added to set preprocessor definitions at directory level. This supersedes :command:`add_definitions`. * The :command:`cmake_minimum_required` and :command:`cmake_policy(VERSION)` commands now accept a version range using the form ``[...]``. The ```` version is required but policies are set based on the older of the running CMake version and the version specified by ````. This allows projects to specify a range of versions for which they have been updated and avoid explicit policy settings. * The :command:`file(GLOB)` and :command:`file(GLOB_RECURSE)` commands learned a new flag ``CONFIGURE_DEPENDS`` which enables expression of build system dependency on globbed directory's contents. * The :command:`file(TOUCH)` and :command:`file(TOUCH_NOCREATE)` commands were added to expose ``TOUCH`` functionality without having to use CMake's command-line tool mode with :command:`execute_process`. * The :command:`find_package` command now searches prefixes specified by the :variable:`_ROOT` CMake variable and the :envvar:`_ROOT` environment variable. Package roots are maintained as a stack so nested calls to all ``find_*`` commands inside find modules also search the roots as prefixes. See policy :policy:`CMP0074`. * The :command:`install` command learned an optional ``NAMELINK_COMPONENT`` parameter, which allows you to change the component for a shared library's namelink. If none is specified, the value of ``COMPONENT`` is used by default. * The :command:`list` command learned a ``JOIN`` sub-command to concatenate list's elements separated by a glue string. * The :command:`list` command learned a ``SUBLIST`` sub-command to get a sublist of the list. * The :command:`list` command learned a ``TRANSFORM`` sub-command to apply various string transformation to list's elements. * The :command:`project` command learned an optional ``HOMEPAGE_URL`` parameter which has the effect of setting variables like :variable:`PROJECT_HOMEPAGE_URL`, :variable:`_HOMEPAGE_URL` and :variable:`CMAKE_PROJECT_HOMEPAGE_URL`. * The :command:`string` command learned a ``JOIN`` sub-command to concatenate input strings separated by a glue string. * :command:`target_compile_options` and :command:`add_compile_options` commands gained a ``SHELL:`` prefix to specify a group of related options using shell-like quoting. * The :command:`target_link_libraries` command now supports :ref:`Object Libraries`. Linking to an object library uses its object files in direct dependents and also propagates usage requirements. Variables --------- * The :variable:`CMAKE_FOLDER` variable was added to initialize the :prop_tgt:`FOLDER` property on all targets. * The :variable:`CMAKE_DOTNET_TARGET_FRAMEWORK_VERSION` variable was defined to initialize all :prop_tgt:`DOTNET_TARGET_FRAMEWORK_VERSION` target properties. * ``CMAKE_PROJECT_VERSION*`` variables have been introduced: - :variable:`CMAKE_PROJECT_VERSION` - :variable:`CMAKE_PROJECT_VERSION_MAJOR` - :variable:`CMAKE_PROJECT_VERSION_MINOR` - :variable:`CMAKE_PROJECT_VERSION_PATCH` - :variable:`CMAKE_PROJECT_VERSION_TWEAK` * The :variable:`CMAKE_SUPPRESS_REGENERATION` variable was extended to support the :generator:`Ninja` and :ref:`Makefile Generators`. It is also now documented. * ``CMAKE_VS_SDK_*_DIRECTORIES`` variables were defined to tell :ref:`Visual Studio Generators` for VS 2010 and above how to populate fields in ``.vcxproj`` files that specify SDK directories. The variables are: - :variable:`CMAKE_VS_SDK_EXCLUDE_DIRECTORIES` - :variable:`CMAKE_VS_SDK_EXECUTABLE_DIRECTORIES` - :variable:`CMAKE_VS_SDK_INCLUDE_DIRECTORIES` - :variable:`CMAKE_VS_SDK_LIBRARY_DIRECTORIES` - :variable:`CMAKE_VS_SDK_LIBRARY_WINRT_DIRECTORIES` - :variable:`CMAKE_VS_SDK_REFERENCE_DIRECTORIES` - :variable:`CMAKE_VS_SDK_SOURCE_DIRECTORIES` * A :variable:`MSVC_TOOLSET_VERSION` variable was added to provide the MSVC toolset version associated with the current MSVC compiler version in :variable:`MSVC_VERSION`. Properties ---------- * The :prop_tgt:`COMMON_LANGUAGE_RUNTIME` target property was introduced to configure the use of managed C++ for :ref:`Visual Studio Generators` for VS 2010 and above. A corresponding :prop_tgt:`IMPORTED_COMMON_LANGUAGE_RUNTIME` target property was added to support ``C++/CLI`` for imported targets. * The :prop_tgt:`DOTNET_TARGET_FRAMEWORK_VERSION` target property was introduced as replacement for :prop_tgt:`VS_DOTNET_TARGET_FRAMEWORK_VERSION`, which is considered deprecated now. * An :prop_tgt:`EXPORT_PROPERTIES` target property was added to specify a custom list of target properties to include in targets exported by the :command:`install(EXPORT)` and :command:`export` commands. * The :prop_tgt:`PDB_OUTPUT_DIRECTORY` property learned to support :manual:`generator expressions `. * A :prop_dir:`TESTS` directory property was added to hold the list of tests defined by the :command:`add_test` command. * A :prop_tgt:`VS_DEBUGGER_COMMAND` target property was created to set the debugging command line with :ref:`Visual Studio Generators` for VS 2010 and above. * HLSL source file properties :prop_sf:`VS_SHADER_DISABLE_OPTIMIZATIONS` and :prop_sf:`VS_SHADER_ENABLE_DEBUG` gained support for generator expressions. * HLSL source file property :prop_sf:`VS_SHADER_OBJECT_FILE_NAME` has been added to the :ref:`Visual Studio Generators` for VS 2010 and above. The property specifies the file name of the compiled shader object. Modules ------- * The :module:`FindALSA` module now provides imported targets. * The :module:`FindCURL` module now provides imported targets. * The :module:`FindJPEG` module now provides imported targets. * The :module:`FindLibXml2` module now provides imported targets. * The :module:`FindMatlab` module now supports the Matlab Runtime Compiler (MCR) for compiling and linking matlab extensions. * A :module:`FindODBC` module was added to find an Open Database Connectivity (ODBC) library. * The :module:`FindPkgConfig` module has learned to export the found libraries with full path for direct consumption with the :command:`target_link_libraries` command. * New :module:`FindPython3` and :module:`FindPython2` modules, as well as a new :module:`FindPython` module, have been added to provide a new way to locate python environments. * The :module:`UseSWIG` module gained a whole refresh and is now more consistent with standard CMake commands to generate libraries and is fully configurable through properties. * The :module:`UseSWIG` module learned to manage multiple behaviors through ``UseSWIG_MODULE_VERSION`` variable to ensure legacy support as well as more robust handling of ``SWIG`` advanced features (like ``%template``). * The :module:`UseSWIG` module learned to support CSHARP variant wrapper files. * The :module:`WriteCompilerDetectionHeader` module gained a ``BARE_FEATURES`` option to add a compatibility define for the exact keyword of a new language feature. Generator Expressions --------------------- * A new ``$`` and ``$`` :manual:`generator expression ` has been added to enable consumption of generator expressions whose evaluation results itself in generator expressions. * A new ``$`` :manual:`generator expression ` has been added. * A new ``$`` :manual:`generator expression ` has been added. * A new ``$`` :manual:`generator expression ` has been added. CTest ----- * The :command:`ctest_start` command has been reworked so that you can simply call ``ctest_start(APPEND)`` and it will read all the needed information from the TAG file. The argument parsing has also been relaxed so that the order of the arguments is less significant. * A :prop_test:`PROCESSOR_AFFINITY` test property was added to request that CTest run a test with CPU affinity for a set of processors disjoint from other concurrently running tests with the property set. CPack ----- * The :module:`CPack` module now uses variables :variable:`CMAKE_PROJECT_VERSION_MAJOR`, :variable:`CMAKE_PROJECT_VERSION_MINOR` and :variable:`CMAKE_PROJECT_VERSION_PATCH` to initialize corresponding CPack variables. * A :cpack_gen:`CPack NuGet Generator` was was added with basic support for `NuGet`_. .. _NuGet: https://docs.microsoft.com/en-us/nuget/what-is-nuget Other ----- * The :manual:`Compile Features ` functionality is now aware of C++ 20. No specific features are yet enumerated besides the ``cxx_std_20`` meta-feature. * The :manual:`Compile Features ` functionality is now aware of the availability of C features in MSVC since VS 2010. * The :manual:`Compile Features ` functionality is now aware of C language standards supported by Texas Instruments C compilers. Deprecated and Removed Features =============================== * The :generator:`Visual Studio 8 2005` generator has been removed. * CMake no longer produces ``_LIB_DEPENDS`` cache entries for library targets. See policy :policy:`CMP0073`. Other Changes ============= * Include flags for directories marked as ``SYSTEM`` are now moved after non-system directories. The ``-isystem`` flag does this automatically, so moving them explicitly to the end makes the behavior consistent on compilers that do not have any ``-isystem`` flag. * Fortran dependency scanning now supports dependencies implied by `Fortran Submodules`_. * The existence and functionality of the file ``${CMAKE_BINARY_DIR}/cmake_install.cmake`` has now been documented in the :command:`install` documentation so that external packaging software can take advantage of CPack-style component installs. * The :module:`CheckIncludeFile` module ``check_include_file`` macro learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable. See policy :policy:`CMP0075`. * The :module:`CheckIncludeFileCXX` module ``check_include_file_cxx`` macro learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable. See policy :policy:`CMP0075`. * The :module:`CheckIncludeFiles` module ``check_include_files`` macro learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable. See policy :policy:`CMP0075`. * The :manual:`cmake(1)` ``-E copy_directory`` tool now fails when the source directory does not exist. Previously it succeeded by creating an empty destination directory. * The :module:`UseSWIG` module :command:`swig_add_library` command (and legacy ``swig_add_module`` command) now set the prefix of Java modules to ``""`` for MINGW, MSYS, and CYGWIN environments. .. _`Fortran Submodules`: http://fortranwiki.org/fortran/show/Submodules