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274 lines
10 KiB
274 lines
10 KiB
CMake 3.4 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 3.3 include the following.
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New Features
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============
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Generators
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----------
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* The :generator:`Visual Studio 14 2015` generator learned to select
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a Windows 10 SDK based on the value of the :variable:`CMAKE_SYSTEM_VERSION`
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variable and the SDKs available on the host.
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* CMake learned rudimentary support for the Apple Swift language. When using
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the :generator:`Xcode` generator with Xcode 6.1 or higher, one may enable
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the ``Swift`` language with the :command:`enable_language` command or the
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:command:`project` command (this is an error with other generators or when
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Xcode is too old). Then one may list ``.swift`` source files in targets
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for compilation.
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Commands
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--------
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* The :command:`find_program` command learned a ``NAMES_PER_DIR``
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option to consider all given ``NAMES`` in each directory before
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moving on to the next directory.
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* The :command:`get_filename_component` command learned a new ``BASE_DIR``
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subcommand. This is used to specify a base directory when calculating an
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absolute path from a relative path.
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* The :command:`if` command learned a new ``TEST`` operator that evaluates
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to true if a given test name has been defined by the :command:`add_test`
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command. See policy :policy:`CMP0064`.
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* The :command:`install(DIRECTORY)` command ``DESTINATION`` option learned to
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support :manual:`generator expressions <cmake-generator-expressions(7)>`.
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* The :command:`install(FILES)` command ``DESTINATION`` option learned to
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support :manual:`generator expressions <cmake-generator-expressions(7)>`.
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* The :command:`string` command learned a new ``APPEND`` subcommand.
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Variables
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---------
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* The :ref:`Makefile Generators` and the :generator:`Ninja` generator
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learned to add compiler launcher tools like distcc and ccache along
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with the compiler for ``C`` and ``CXX`` languages. See the
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:variable:`CMAKE_<LANG>_COMPILER_LAUNCHER` variable and
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:prop_tgt:`<LANG>_COMPILER_LAUNCHER` target property for details.
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* New :variable:`CMAKE_LINK_SEARCH_START_STATIC` and
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:variable:`CMAKE_LINK_SEARCH_END_STATIC` variables were
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introduced to initialize the
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:prop_tgt:`LINK_SEARCH_START_STATIC` and
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:prop_tgt:`LINK_SEARCH_END_STATIC` target properties,
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respectively.
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Properties
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----------
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* :ref:`Visual Studio Generators` learned to support additional
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target properties to customize projects for NVIDIA Nsight
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Tegra Visual Studio Edition:
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* :prop_tgt:`ANDROID_ANT_ADDITIONAL_OPTIONS`
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* :prop_tgt:`ANDROID_ARCH`
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* :prop_tgt:`ANDROID_ASSETS_DIRECTORIES`
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* :prop_tgt:`ANDROID_JAR_DEPENDENCIES`
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* :prop_tgt:`ANDROID_JAR_DIRECTORIES`
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* :prop_tgt:`ANDROID_JAVA_SOURCE_DIR`
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* :prop_tgt:`ANDROID_NATIVE_LIB_DEPENDENCIES`
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* :prop_tgt:`ANDROID_NATIVE_LIB_DIRECTORIES`
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* :prop_tgt:`ANDROID_PROCESS_MAX`
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* :prop_tgt:`ANDROID_PROGUARD`
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* :prop_tgt:`ANDROID_PROGUARD_CONFIG_PATH`
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* :prop_tgt:`ANDROID_SECURE_PROPS_PATH`
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* :prop_tgt:`ANDROID_SKIP_ANT_STEP`
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* :prop_tgt:`ANDROID_STL_TYPE`
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* The :prop_tgt:`ARCHIVE_OUTPUT_DIRECTORY`,
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:prop_tgt:`LIBRARY_OUTPUT_DIRECTORY`, and
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:prop_tgt:`RUNTIME_OUTPUT_DIRECTORY` target properties learned to
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support :manual:`generator expressions <cmake-generator-expressions(7)>`.
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* The :prop_tgt:`SOURCE_DIR` and :prop_tgt:`BINARY_DIR` target properties
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were introduced to allow project code to query where a target is defined.
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* The :prop_tgt:`OUTPUT_NAME` target property and its variants learned to
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support :manual:`generator expressions <cmake-generator-expressions(7)>`.
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* A :prop_gbl:`TARGET_MESSAGES` global property was added to tell the
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:ref:`Makefile Generators` whether to generate commands to print output
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after each target is completed.
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* On Windows with MS-compatible tools, CMake learned to optionally
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generate a module definition (``.def``) file for ``SHARED`` libraries.
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See the :prop_tgt:`WINDOWS_EXPORT_ALL_SYMBOLS` target property.
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Modules
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-------
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* The :module:`ExternalProject` module :command:`ExternalProject_Add`
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function ``GIT_SUBMODULES`` option now also limits the set of
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submodules that are initialized in addition to the prior behavior
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of limiting the set of submodules that are updated.
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* The :module:`ExternalProject` module learned new ``USES_TERMINAL``
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arguments for giving steps exclusive terminal access. This is
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useful with the :generator:`Ninja` generator to monitor CMake
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superbuild progress and prevent CPU oversubscription.
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* The :module:`FindBISON` module ``BISON_TARGET`` macro learned a
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new ``DEFINES_FILE`` option to specify a custom output header
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to be generated.
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* The :module:`FindHDF5` module learend a new ``HDF5_PREFER_PARALLEL``
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option allowing users to specify that a parallel HDF5 tool is
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preferred if both are available.
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* The :module:`FindIce` module now provides imported targets.
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* The :module:`FindJava` module learned to optionally find
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the ``idlj`` and ``jarsigner`` tools.
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* The :module:`FindOpenSSL` module now provides imported targets.
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* The :module:`FindOpenSSL` module learned a new ``OPENSSL_USE_STATIC_LIBS``
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option to search only for static libraries.
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* The :module:`FindPkgConfig` learned a new :command:`pkg_get_variable`
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command which may be used to query for arbitrary variables from a package
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(such as for related tools or data and plugin install paths).
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* The :module:`FindProtobuf` module gained a new
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:command:`protobuf_generate_python` function to generate python
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sources from ``.proto`` files.
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* The :module:`FindTIFF` module learned to search separately for
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debug and release variants.
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* The :module:`FindwxWidgets` module learned to support version requests.
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* The :module:`FindXercesC` module learned to search separately for
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debug and release variants.
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* The :module:`FindZLIB` module learned to search separately for
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debug and release variants.
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* The :module:`GNUInstallDirs` module learned special default values
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for certain installation prefixes according to the `GNU Coding
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Standards`_ and the `Filesystem Hierarchy Standard`_.
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* The :module:`UseJava` module ``add_jar`` function learned
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to support response files (e.g. ``@srcs.txt``) for source
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specification.
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* The :module:`UseJava` module ``install_jar`` function learned
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new ``DESTINATION`` and ``COMPONENT`` options to specify
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the corresponding :command:`install` command options.
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* The :module:`UseJava` module gained a new ``create_javah``
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function to create C headers from Java classes.
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.. _`GNU Coding Standards`: https://www.gnu.org/prep/standards/html_node/Directory-Variables.html
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.. _`Filesystem Hierarchy Standard`: https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html
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Generator Expressions
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---------------------
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* A new ``$<SHELL_PATH:...>``
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:manual:`generator expression <cmake-generator-expressions(7)>`
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has been added.
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CTest
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-----
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* CTest learned to optionally measure the CPU load during parallel
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testing and avoid starting tests that may cause the load to exceed
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a given threshold. See the :manual:`ctest(1)` command ``--test-load``
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option, the ``TestLoad`` setting of the :ref:`CTest Test Step`,
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the :variable:`CTEST_TEST_LOAD` variable, and the ``TEST_LOAD``
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option of the :command:`ctest_test` command.
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* :manual:`ctest(1)` learned options
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``--test-output-size-passed`` and ``--test-output-size-failed``
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to customize the limit on test output size submitted when
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running as a :ref:`Dashboard Client`.
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CPack
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-----
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* The :cpack_gen:`CPack DEB Generator` learned to set package dependencies
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per component. See variables:
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* :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_BREAKS`
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* :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_CONFLICTS`
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* :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_ENHANCES`
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* :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_PREDEPENDS`
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* :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_PROVIDES`
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* :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_RECOMMENDS`
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* :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_REPLACES`
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* :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_SUGGESTS`
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* The :module:`CPack` module learned to package empty directories.
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* The :module:`CPack` module gained a new setting, ``CPACK_VERBATIM_VARIABLES``,
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which can be used to ensure the cpack program receives the settings' values
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exactly as they were set, even if they contain CMake-special characters.
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For compatibility, it's off by default.
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Other
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-----
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* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
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is now aware of features supported by GNU C compilers on Windows.
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* CMake learned to honor ``*.manifest`` source files with MSVC tools.
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Manifest files named as sources of ``.exe`` and ``.dll`` targets
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will be merged with linker-generated manifests and embedded in the
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binary.
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* The Concurrent Fortran 77 compiler is now supported.
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Its :variable:`compiler id <CMAKE_<LANG>_COMPILER_ID>` is ``CCur``.
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* :manual:`cmake(1)` gained a new ``--trace-expand`` command line option
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that is like ``--trace`` but expands variable references in the output.
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Deprecated and Removed Features
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===============================
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* The :module:`CMakeExpandImportedTargets` module is now documented
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as deprecated. See module documentation for an explanation.
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* The :variable:`CMAKE_USE_RELATIVE_PATHS` variable no longer has any
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effect. Previously it was partially implemented and unreliable.
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Other Changes
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=============
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* The :module:`CheckFunctionExists`, :module:`CheckLibraryExists`,
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:module:`CheckSymbolExists`, and :module:`FindThreads` modules learned to
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work in environments where only CXX is enabled.
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* The :cpack_gen:`CPack DEB Generator` now correctly excludes symlinks
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during package checksum calculation.
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* The :cpack_gen:`CPack DEB Generator` no longer uses fakeroot and
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system tar program for packaging.
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* The :module:`CPack` module no longer mangles settings with CMake-special
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characters when they're used as defaults for other settings. The macro
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``cpack_set_if_not_set``, which was responsible for this, is now deprecated.
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* CMake no longer links executables with flags to export symbols
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unless the :prop_tgt:`ENABLE_EXPORTS` target property is set.
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See policy :policy:`CMP0065`.
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* The ``SONAME`` field is no longer set for ``MODULE`` libraries
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created with the :command:`add_library` command. ``MODULE``
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libraries are meant for explicit dynamic loading at runtime.
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They cannot be linked so ``SONAME`` is not useful.
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* The internal :variable:`CMAKE_<LANG>_COMPILE_OBJECT` rule variable now
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substitutes compiler include flags in a separate ``<INCLUDES>`` placeholder
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instead of the main ``<FLAGS>`` placeholder.
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