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344 lines
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ReStructuredText
344 lines
15 KiB
ReStructuredText
CMake 3.9 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 3.8 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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* ``CUDA`` is now supported by the :ref:`Visual Studio Generators`
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for VS 2010 and above. This complements the existing support by the
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:ref:`Makefile Generators` and the :generator:`Ninja` generator.
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CUDA 8.0.61 or higher is recommended due to known bugs in the VS
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integration by earlier versions.
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* CMake is now aware of the :prop_tgt:`C++ standards <CXX_STANDARD>` and
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:prop_tgt:`C standards <C_STANDARD>` and their associated meta-features for
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the following :variable:`compiler ids <CMAKE_<LANG>_COMPILER_ID>`: ``Cray``,
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``PGI``, and ``XL``.
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Generators
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----------
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* :ref:`Visual Studio Generators` for VS 2010 and above learned to support
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the ``ASM_NASM`` language when ``nasm`` is installed.
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* The :generator:`Xcode` generator learned to create Xcode schema files.
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This is an experimental feature and can be activated by setting the
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:variable:`CMAKE_XCODE_GENERATE_SCHEME` variable to a ``TRUE`` value.
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Commands
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--------
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* The :command:`add_library` command ``IMPORTED`` option learned to support
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:ref:`Object Libraries`.
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* The :command:`find_library` command learned to search ``libx32`` paths
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when the build targets the ``x32`` ABI. See the
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:prop_gbl:`FIND_LIBRARY_USE_LIBX32_PATHS` global property.
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* The :command:`include_external_msproject` command learned to use
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the :prop_tgt:`MAP_IMPORTED_CONFIG_<CONFIG>` target property
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to map current configurations to the external configurations.
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* The :command:`install(TARGETS)` command learned a new ``OBJECTS`` option to
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specify where to install :ref:`Object Libraries`.
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* The :command:`install(EXPORT)` command learned how to export
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:ref:`Object Libraries`.
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* The :command:`project` command learned an optional ``DESCRIPTION``
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parameter to set the :variable:`PROJECT_DESCRIPTION` variable.
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* The :command:`separate_arguments` command gained a ``NATIVE_COMMAND`` mode
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that performs argument separation depending on the host operating system.
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Variables
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---------
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* A :variable:`CMAKE_ANDROID_NDK_DEPRECATED_HEADERS` variable was added
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for use when :ref:`Cross Compiling for Android with the NDK` to request
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use of the deprecated headers even when unified headers are available.
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The default is now to use unified headers if available.
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* A :variable:`CMAKE_AUTOMOC_DEPEND_FILTERS` variable was introduced to
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allow :variable:`CMAKE_AUTOMOC` to extract additional dependency file names
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for ``moc`` from the contents of source files.
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* A :variable:`CMAKE_AUTOUIC_SEARCH_PATHS` variable was introduced to
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allow :variable:`CMAKE_AUTOUIC` to search for ``foo.ui`` in more
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places than the vicinity of the file including ``ui_foo.h``.
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* A :variable:`CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX` variable was added to
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tell the :command:`find_library` command to search in a ``lib<suffix>``
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directory before each ``lib`` directory that would normally be searched.
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* A :variable:`CMAKE_INTERPROCEDURAL_OPTIMIZATION` variable was added to
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initialize the :prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` property on all
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targets.
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* A :variable:`CMAKE_<LANG>_COMPILER_AR` variable was added to hold
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the path to the GCC/Clang wrapper of ``ar``.
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* A :variable:`CMAKE_<LANG>_COMPILER_RANLIB` variable was added to hold
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the path to the GCC/Clang wrapper of ``ranlib``.
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* The :variable:`CMAKE_SYSROOT_COMPILE` and :variable:`CMAKE_SYSROOT_LINK`
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variables were added to use separate sysroots for compiling and linking.
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Properties
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----------
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* A new :prop_tgt:`AUTOGEN_BUILD_DIR` target property was introduced to set
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a custom output directory for :prop_tgt:`AUTOMOC`, :prop_tgt:`AUTOUIC`,
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and :prop_tgt:`AUTORCC`.
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* A new :prop_tgt:`AUTOMOC_DEPEND_FILTERS` target property was introduced to
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allow :prop_tgt:`AUTOMOC` to extract additional dependency file names
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for ``moc`` from the contents of source files.
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* A new :prop_tgt:`AUTOUIC_SEARCH_PATHS` target property was introduced to
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allow :prop_tgt:`AUTOUIC` to search for ``foo.ui`` in more
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places than the vicinity of the file including ``ui_foo.h``.
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* Global properties :prop_gbl:`AUTOGEN_SOURCE_GROUP`,
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:prop_gbl:`AUTOMOC_SOURCE_GROUP` and
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:prop_gbl:`AUTORCC_SOURCE_GROUP` were
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introduced to allow files generated by :prop_tgt:`AUTOMOC` or
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:prop_tgt:`AUTORCC` to be placed in a :command:`source_group`.
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* A :prop_tgt:`BUILD_WITH_INSTALL_NAME_DIR` target property and corresponding
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:variable:`CMAKE_BUILD_WITH_INSTALL_NAME_DIR` variable were added to
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control whether to use the :prop_tgt:`INSTALL_NAME_DIR` target property
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value for binaries in the build tree. This is for macOS ``install_name``
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as :prop_tgt:`BUILD_WITH_INSTALL_RPATH` is for ``RPATH``.
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* A :prop_tgt:`CUDA_PTX_COMPILATION` target property was added to
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:ref:`Object Libraries` to support compiling to ``.ptx`` files
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instead of host object files.
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* A :prop_gbl:`GENERATOR_IS_MULTI_CONFIG` global property was
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added to determine whether the current generator is a multi-configuration
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generator (such as :ref:`Visual Studio Generators` or :generator:`Xcode`).
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* The :prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` target property is now enforced
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when enabled. CMake will add IPO flags unconditionally or produce an error
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if it does not know the flags for the current compiler. The project is now
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responsible to use the :module:`CheckIPOSupported` module to check for IPO
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support before enabling the target property. See policy :policy:`CMP0069`.
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* The :prop_tgt:`WINDOWS_EXPORT_ALL_SYMBOLS` target property may now
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be used in combination with explicit ``.def`` files in order to
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export all symbols from the object files within a target plus
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an explicit list of symbols that the linker finds in dependencies
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(e.g. ``msvcrt.lib``).
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Modules
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-------
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* A :module:`CheckIPOSupported` module was added to help projects
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check whether interprocedural optimization (IPO) is supported by
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the current toolchain and CMake version.
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* The :module:`CMakeFindDependencyMacro` module ``find_dependency`` macro
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now forwards all arguments to the underlying :command:`find_package`
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call. Existing uses will continue to function as before, but callers can
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now access the full suite of arguments that :command:`find_package` accepts.
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* The :module:`FeatureSummary` module :command:`feature_summary` command now
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accepts the new ``DEFAULT_DESCRIPTION`` option that will print the default
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title for the selected package type.
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* The :module:`FeatureSummary` module gained a new
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:variable:`FeatureSummary_<TYPE>_DESCRIPTION` variable that can be defined
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for each ``<TYPE>`` to replace the type name with the specified string
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whenever the package type is used in an output string by the module.
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* The :module:`FindDoxygen` module learned to control Doxygen behavior using
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CMake variables and generate documentation via the newly added
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:command:`doxygen_add_docs` function. The Doxygen input file (``Doxyfile``)
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is automatically generated and doxygen is run as part of a custom target.
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Additional components can be specified to find optional tools: ``dot``,
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``mscgen`` and ``dia``.
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* The :module:`FindMPI` module now provides imported targets.
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* The :module:`FindProtobuf` module :command:`protobuf_generate_cpp`
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command gained an ``EXPORT_MACRO`` option to specify the name of
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a DLL export markup macro.
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* The :module:`FindProtobuf` module now supports usage of static libraries
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for Unix via a new ``Protobuf_USE_STATIC_LIBS`` input variable.
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* The :module:`FindProtobuf` module now provides imported targets
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when the libraries are found.
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* A new :module:`GoogleTest` module was added to provide the
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:command:`gtest_add_tests` function independently of the :module:`FindGTest`
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module. The function was also updated to support keyword arguments, with
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functionality expanded to allow a test name prefix and suffix to be
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specified, the dependency on the source files to be optional and the list of
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discovered test cases to be returned to the caller.
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CTest
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-----
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* The :command:`ctest_submit` command gained a ``HTTPHEADER`` option
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to specify custom headers to send during submission.
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* The :manual:`ctest(1)` executable gained new options which allow the
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developer to disable automatically adding tests to the test set to satisfy
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fixture dependencies. ``-FS`` prevents adding setup tests for fixtures
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matching the provided regular expression, ``-FC`` prevents adding cleanup
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tests for matching fixtures and ``-FA`` prevents adding any test for matching
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fixtures.
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* A :prop_test:`DISABLED` test property was added to mark tests that
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are configured but explicitly disabled so they do not run.
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CPack
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-----
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* The :cpack_gen:`CPack Archive Generator` learned to modify the filename
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per-component. See the :variable:`CPACK_ARCHIVE_FILE_NAME` variable and
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its per-component version :variable:`CPACK_ARCHIVE_<component>_FILE_NAME`.
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* The :module:`CPackComponent` module :command:`cpack_add_component` command
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gained a new ``PLIST <filename>`` option to specify the ``pkgbuild``
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``--component-plist`` argument when using the
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:module:`productbuild <CPackProductBuild>` generator.
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* The :module:`CPackIFW` module :command:`cpack_ifw_configure_component` and
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:command:`cpack_ifw_configure_component_group` commands gained
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internationalization support for ``DISPLAY_NAME`` and ``DESCRIPTION``
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options.
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* The :cpack_gen:`CPack IFW Generator` learned the new hint
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:variable:`CPACK_IFW_ROOT` variable for finding the QtIFW tool suite
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installed in a non-standard place.
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* The :cpack_gen:`CPack productbuild Generator` gained a new
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:variable:`CPACK_PRODUCTBUILD_RESOURCES_DIR` variable to
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specify resources to be copied into the ``Resources``
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directory.
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* The :cpack_gen:`CPack RPM Generator` learned to modify the ``debuginfo``
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package name. See the :variable:`CPACK_RPM_DEBUGINFO_FILE_NAME` variable.
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* The :cpack_gen:`CPack WIX Generator` patching system now has the
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ability to set additional attributes. This can be done by specifying
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attributes with the ``CPackWiXFragment`` XML tag after the ``Id`` attribute.
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See the :variable:`CPACK_WIX_PATCH_FILE` variable.
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* The :cpack_gen:`CPack WIX Generator` implemented a new
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:variable:`CPACK_WIX_ROOT_FOLDER_ID` variable which allows
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using a custom root folder ID instead of the default
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``ProgramFilesFolder`` / ``ProgramFiles64Folder``.
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Other
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-----
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* Interprocedural optimization (IPO) is now supported for GNU and Clang
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compilers using link time optimization (LTO) flags. See the
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:prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` target property and
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:module:`CheckIPOSupported` module.
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* The ``TARGET_OBJECTS``
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:manual:`generator expression <cmake-generator-expressions(7)>`
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is now supported by the :command:`add_custom_command` and
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:command:`file(GENERATE)` commands.
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* Two new informational generator expressions to retrieve Apple Bundle
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directories have been added. The first one :genex:`$<TARGET_BUNDLE_DIR:tgt>`
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outputs the full path to the Bundle directory, the other one
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:genex:`$<TARGET_BUNDLE_CONTENT_DIR:tgt>` outputs the full path to the
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``Contents`` directory of macOS Bundles and App Bundles. For all other
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bundle types and SDKs it is identical with :genex:`$<TARGET_BUNDLE_DIR:tgt>`.
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The new expressions are helpful to query Bundle locations independent of
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the different Bundle types and layouts on macOS and iOS.
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Deprecated and Removed Features
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===============================
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* An explicit deprecation diagnostic was added for policies ``CMP0036``
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and below. The :manual:`cmake-policies(7)` manual explains that the
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OLD behaviors of all policies are deprecated and that projects should
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always port to the NEW behaviors as soon as possible.
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* The :generator:`Visual Studio 8 2005` generator is now deprecated
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and will be removed in a future version of CMake.
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* The :generator:`Visual Studio 7 .NET 2003` generator has been removed.
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* The :generator:`Xcode` generator dropped support for Xcode versions
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older than 3.
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* The :module:`FindDoxygen` module has deprecated several variables.
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* The version of curl bundled with CMake no longer accepts URLs of the form
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``file://c:/...`` on Windows due to a change in upstream curl 7.52. Use
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the form ``file:///c:/...`` instead to work on all versions.
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Other Changes
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=============
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* When using :prop_tgt:`AUTOMOC`, CMake now scans for the presence of the
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``Q_PLUGIN_METADATA`` macro and reruns moc when the file from the
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macro's ``FILE`` argument changes.
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* When :prop_tgt:`AUTOMOC` detects an include statement of the form
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``#include "moc_<basename>.cpp"`` the search for the respective header file
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now looks in the :prop_tgt:`INCLUDE_DIRECTORIES` of the target as well.
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* When running tests, CTest learned to treat skipped tests (using the
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:prop_test:`SKIP_RETURN_CODE` property) the same as tests with the new
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:prop_test:`DISABLED` property. Due to this change, CTest will not indicate
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failure when all tests are either skipped or pass.
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* The :generator:`Ninja` generator has loosened the dependencies of object
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compilation. Object compilation now depends only on custom targets
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and custom commands associated with libraries on which the object's target
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depends and no longer depends on the libraries themselves. Source files
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in dependent targets may now compile without waiting for their targets'
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dependencies to link.
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* On macOS, ``RPATH`` settings such as :prop_tgt:`BUILD_WITH_INSTALL_RPATH`
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no longer affect the ``install_name`` field. See policy :policy:`CMP0068`.
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* The :generator:`Visual Studio 14 2015` generator has been taught about
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a change to the ``v140`` toolset made by a VS 2015 update. VS changed
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the set of values it understands for the ``GenerateDebugInformation``
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linker setting that produces the ``-DEBUG`` linker flag variants.
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Updates
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=======
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Changes made since CMake 3.9.0 include the following.
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3.9.1
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-----
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* The ``find_`` command ``PACKAGE_ROOT`` search path group added by
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CMake 3.9.0 has been removed for the 3.9 series due to regressions
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caused by new use of ``<PackageName>_ROOT`` variables. The behavior
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may be re-introduced in the future in a more-compatible way.
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3.9.2
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-----
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* On macOS, the default application bundle ``Info.plist`` file no longer
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enables Hi-DPI support as it did in 3.9.0 and 3.9.1. The change had
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to be reverted because it broke iOS applications.
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* The Xcode generator no longer adds "outputPaths" to custom script
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build phases as it did in 3.9.0 and 3.9.1. This was added in an
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attempt to support Xcode 9's new build system, but broke incremental
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rebuilds for both the old and new Xcode build systems.
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