CMake/Help/release/3.1.0.rst

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CMake 3.1.0 Release Notes
*************************
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.. contents::
Changes made since CMake 3.0.0 include the following.
Documentation Changes
=====================
* A new :manual:`cmake-compile-features(7)` manual was added.
New Features
============
Generators
----------
* The :generator:`Visual Studio 14 2015` generator was added.
Windows Phone and Windows Store
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* Generators for Visual Studio 11 (2012) and above learned to generate
projects for Windows Phone and Windows Store. One may set the
:variable:`CMAKE_SYSTEM_NAME` variable to ``WindowsPhone``
or ``WindowsStore`` on the :manual:`cmake(1)` command-line
or in a :variable:`CMAKE_TOOLCHAIN_FILE` to activate these platforms.
Also set :variable:`CMAKE_SYSTEM_VERSION` to ``8.0`` or ``8.1`` to
specify the version of Windows to be targeted.
NVIDIA Nsight Tegra
^^^^^^^^^^^^^^^^^^^
* Generators for Visual Studio 10 (2010) and above learned to generate
projects for NVIDIA Nsight Tegra Visual Studio Edition. One may set
the :variable:`CMAKE_SYSTEM_NAME` variable to ``Android`` on the
:manual:`cmake(1)` command-line or in a :variable:`CMAKE_TOOLCHAIN_FILE`
to activate this platform.
Syntax
------
* The :manual:`cmake-language(7)` syntax for :ref:`Variable References` and
:ref:`Escape Sequences` was simplified in order to allow a much faster
implementation. See policy :policy:`CMP0053`.
* The :command:`if` command no longer automatically dereferences
variables named in quoted or bracket arguments. See policy
:policy:`CMP0054`.
Commands
--------
* The :command:`add_custom_command` command learned to interpret
:manual:`cmake-generator-expressions(7)` in arguments to ``DEPENDS``.
* The :command:`export(PACKAGE)` command learned to check the
:variable:`CMAKE_EXPORT_NO_PACKAGE_REGISTRY` variable to skip
exporting the package.
* The :command:`file(STRINGS)` command gained a new ``ENCODING``
option to enable extraction of ``UTF-8`` strings.
* The :command:`find_package` command learned to check the
:variable:`CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY` and
:variable:`CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY`
variables to skip searching the package registries.
* The :command:`install` command learned a ``MESSAGE_NEVER`` option
to avoid output during installation.
* The :command:`string` command learned a new ``GENEX_STRIP`` subcommand
which removes
:manual:`generator expression <cmake-generator-expressions(7)>`.
* The :command:`string` command learned a new ``UUID`` subcommand
to generate a univerally unique identifier.
* New :command:`target_compile_features` command allows populating the
:prop_tgt:`COMPILE_FEATURES` target property, just like any other
build variable.
* The :command:`target_sources` command was added to add to the
:prop_tgt:`SOURCES` target property.
Variables
---------
* The Visual Studio generators for versions 8 (2005) and above
learned to read the target platform name from a new
:variable:`CMAKE_GENERATOR_PLATFORM` variable when it is
not specified as part of the generator name. The platform
name may be specified on the :manual:`cmake(1)` command line
with the ``-A`` option, e.g. ``-G "Visual Studio 12 2013" -A x64``.
* The :variable:`CMAKE_GENERATOR_TOOLSET` variable may now be
initialized in a toolchain file specified by the
:variable:`CMAKE_TOOLCHAIN_FILE` variable. This is useful
when cross-compiling with the Xcode or Visual Studio
generators.
* The :variable:`CMAKE_INSTALL_MESSAGE` variable was introduced to
optionally reduce output installation.
Properties
----------
* New :prop_tgt:`CXX_STANDARD` and :prop_tgt:`CXX_EXTENSIONS` target
properties may specify values which CMake uses to compute required
compile options such as ``-std=c++11`` or ``-std=gnu++11``. The
:variable:`CMAKE_CXX_STANDARD` and :variable:`CMAKE_CXX_EXTENSIONS`
variables may be set to initialize the target properties.
* New :prop_tgt:`C_STANDARD` and :prop_tgt:`C_EXTENSIONS` target
properties may specify values which CMake uses to compute required
compile options such as ``-std=c11`` or ``-std=gnu11``. The
:variable:`CMAKE_C_STANDARD` and :variable:`CMAKE_C_EXTENSIONS`
variables may be set to initialize the target properties.
* New :prop_tgt:`COMPILE_FEATURES` target property may contain a list
of features required to compile a target. CMake uses this
information to ensure that the compiler in use is capable of building
the target, and to add any necessary compile flags to support language
features.
* New :prop_tgt:`COMPILE_PDB_NAME` and
:prop_tgt:`COMPILE_PDB_OUTPUT_DIRECTORY` target properties
were introduced to specify the MSVC compiler program database
file location (``cl /Fd``). This complements the existing
:prop_tgt:`PDB_NAME` and :prop_tgt:`PDB_OUTPUT_DIRECTORY`
target properties that specify the linker program database
file location (``link /pdb``).
* The :prop_tgt:`INTERFACE_LINK_LIBRARIES` target property now supports
a ``$<LINK_ONLY:...>``
:manual:`generator expression <cmake-generator-expressions(7)>`.
* A new :prop_tgt:`INTERFACE_SOURCES` target property was introduced. This is
consumed by dependent targets, which compile and link the listed sources.
* The :prop_tgt:`SOURCES` target property now contains
:manual:`generator expression <cmake-generator-expressions(7)>`
such as ``TARGET_OBJECTS`` when read at configure time, if
policy :policy:`CMP0051` is ``NEW``.
* The :prop_tgt:`SOURCES` target property now generally supports
:manual:`generator expression <cmake-generator-expressions(7)>`. The
generator expressions may be used in the :command:`add_library` and
:command:`add_executable` commands.
* It is now possible to write and append to the :prop_tgt:`SOURCES` target
property. The :variable:`CMAKE_DEBUG_TARGET_PROPERTIES` variable may be
used to trace the origin of sources.
* A :prop_sf:`VS_DEPLOYMENT_CONTENT` source file property was added
to tell the Visual Studio generators to mark content for deployment
in Windows Phone and Windows Store projects.
* The :prop_tgt:`VS_WINRT_COMPONENT` target property was created to
tell Visual Studio generators to compile a shared library as a
Windows Runtime (WinRT) component.
* The :generator:`Xcode` generator learned to check source
file properties :prop_sf:`XCODE_EXPLICIT_FILE_TYPE` and
:prop_sf:`XCODE_LAST_KNOWN_FILE_TYPE` for a custom Xcode
file reference type.
Modules
-------
* The :module:`BundleUtilities` module learned to resolve and replace
``@rpath`` placeholders on OS X to correctly bundle applications
using them.
* The :module:`CMakePackageConfigHelpers` module
:command:`configure_package_config_file` command learned a new
``INSTALL_PREFIX`` option to generate package configuration files
meant for a prefix other than :variable:`CMAKE_INSTALL_PREFIX`.
* The :module:`CheckFortranSourceCompiles` module was added to
provide a ``CHECK_Fortran_SOURCE_COMPILES`` macro.
* The :module:`ExternalData` module learned to tolerate a ``DATA{}``
reference to a missing source file with a warning instead of
rejecting it with an error. This helps developers write new
``DATA{}`` references to test reference outputs that have not
yet been created.
* The :module:`ExternalProject` module learned to support lzma-compressed
source tarballs with ``.7z``, ``.tar.xz``, and ``.txz`` extensions.
* The :module:`ExternalProject` module ``ExternalProject_Add`` command
learned a new ``BUILD_ALWAYS`` option to cause the external project
build step to run every time the host project is built.
* The :module:`ExternalProject` module ``ExternalProject_Add`` command
learned a new ``EXCLUDE_FROM_ALL`` option to cause the external
project target to have the :prop_tgt:`EXCLUDE_FROM_ALL` target
property set.
* The :module:`ExternalProject` module ``ExternalProject_Add_Step`` command
learned a new ``EXCLUDE_FROM_MAIN`` option to cause the step to not be
a direct dependency of the main external project target.
* The :module:`ExternalProject` module ``ExternalProject_Add`` command
learned a new ``DOWNLOAD_NO_PROGRESS`` option to disable progress
output while downloading the source tarball.
* The :module:`FeatureSummary` module ``feature_summary`` API
learned to accept multiple values for the ``WHAT`` option and
combine them appropriately.
* The :module:`FindCUDA` module learned to support ``fatbin`` and ``cubin``
modules.
* The :module:`FindGTest` module ``gtest_add_tests`` macro learned
a new ``AUTO`` option to automatically read the :prop_tgt:`SOURCES`
target property of the test executable and scan the source files
for tests to be added.
* The :module:`FindGLEW` module now provides imported targets.
* The :module:`FindGLUT` module now provides imported targets.
* The :module:`FindHg` module gained a new ``Hg_WC_INFO`` macro to
help run ``hg`` to extract information about a Mercurial work copy.
* The :module:`FindOpenCL` module was introduced.
* The :module:`FindOpenGL` module now provides imported targets
``OpenGL::GL`` and ``OpenGL::GLU`` when the libraries are found.
* The :module:`FindOpenMP` module learned to support Fortran.
* The :module:`FindPkgConfig` module learned to use the ``PKG_CONFIG``
environment variable value as the ``pkg-config`` executable, if set.
* The :module:`FindZLIB` module now provides imported targets.
* The :module:`GenerateExportHeader` module ``generate_export_header``
function learned to allow use with :ref:`Object Libraries`.
* The :module:`InstallRequiredSystemLibraries` module gained a new
``CMAKE_INSTALL_OPENMP_LIBRARIES`` option to install MSVC OpenMP
runtime libraries.
* The :module:`UseSWIG` module learned to detect the module name
from ``.i`` source files if possible to avoid the need to set
the ``SWIG_MODULE_NAME`` source file property explicitly.
* The :module:`WriteCompilerDetectionHeader` module was added to allow
creation of a portable header file for compiler optional feature detection.
Generator Expressions
---------------------
* New ``COMPILE_FEATURES``
:manual:`generator expression <cmake-generator-expressions(7)>` allows
setting build properties based on available compiler features.
CTest
-----
* The :command:`ctest_coverage` command learned to read variable
``CTEST_COVERAGE_EXTRA_FLAGS`` to set ``CoverageExtraFlags``.
* The :command:`ctest_coverage` command learned to support
Intel coverage files with the ``codecov`` tool.
* The :command:`ctest_memcheck` command learned to support sanitizer
modes, including ``AddressSanitizer``, ``MemorySanitizer``,
``ThreadSanitizer``, and ``UndefinedBehaviorSanitizer``.
Options may be set using the new
:variable:`CTEST_MEMORYCHECK_SANITIZER_OPTIONS` variable.
CPack
-----
* :manual:`cpack(1)` gained an ``IFW`` generator to package using
Qt Framework Installer tools. See the :module:`CPackIFW` module.
* :manual:`cpack(1)` gained ``7Z`` and ``TXZ`` generators supporting
lzma-compressed archives.
* The :module:`CPackDeb` module learned a new
:variable:`CPACK_DEBIAN_COMPRESSION_TYPE` variable to set the
tarball compression type.
* The :manual:`cpack(1)` ``WiX`` generator learned to support
a :prop_inst:`CPACK_WIX_ACL` installed file property to
specify an Access Control List.
Other
-----
* The :manual:`cmake(1)` ``-E`` option learned a new ``env`` command.
* The :manual:`cmake(1)` ``-E tar`` command learned to support
lzma-compressed files.
* :ref:`Object Libraries` may now have extra sources that do not
compile to object files so long as they would not affect linking
of a normal library (e.g. ``.dat`` is okay but not ``.def``).
* Visual Studio generators for VS 8 and later learned to support
the ``ASM_MASM`` language.
* The Visual Studio generators learned to treat ``.hlsl`` source
files as High Level Shading Language sources (using ``FXCompile``
in ``.vcxproj`` files). A :prop_sf:`VS_SHADER_TYPE` source file
property was added to specify the Shader Type.
New Diagnostics
===============
* Policy :policy:`CMP0052` introduced to control directories in the
:prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` of exported targets.
Deprecated and Removed Features
===============================
* In CMake 3.0 the :command:`target_link_libraries` command
accidentally began allowing unquoted arguments to use
:manual:`generator expressions <cmake-generator-expressions(7)>`
containing a (``;`` separated) list within them. For example::
set(libs B C)
target_link_libraries(A PUBLIC $<BUILD_INTERFACE:${libs}>)
This is equivalent to writing::
target_link_libraries(A PUBLIC $<BUILD_INTERFACE:B C>)
and was never intended to work. It did not work in CMake 2.8.12.
Such generator expressions should be in quoted arguments::
set(libs B C)
target_link_libraries(A PUBLIC "$<BUILD_INTERFACE:${libs}>")
CMake 3.1 again requires the quotes for this to work correctly.
* Callbacks established by the :command:`variable_watch` command will no
longer receive the ``ALLOWED_UNKNOWN_READ_ACCESS`` access type when
the undocumented ``CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS`` variable is
set. Uninitialized variable accesses will always be reported as
``UNKNOWN_READ_ACCESS``.
* The :module:`CMakeDetermineVSServicePack` module now warns that
it is deprecated and should not longer be used. Use the
:variable:`CMAKE_<LANG>_COMPILER_VERSION` variable instead.
* The :module:`FindITK` module has been removed altogether.
It was a thin-wrapper around ``find_package(ITK ... NO_MODULE)``.
This produces much clearer error messages when ITK is not found.
* The :module:`FindVTK` module has been removed altogether.
It was a thin-wrapper around ``find_package(VTK ... NO_MODULE)``.
This produces much clearer error messages when VTK is not found.
The module also provided compatibility support for finding VTK 4.0.
This capability has been dropped.
Other Changes
=============
* The :manual:`cmake-gui(1)` learned to capture output from child
processes started by the :command:`execute_process` command
and display it in the output window.
* The :manual:`cmake-language(7)` internal implementation of generator
expression and list expansion parsers have been optimized and shows
non-trivial speedup on large projects.
* The Makefile generators learned to use response files with GNU tools
on Windows to pass library directories and names to the linker.
* When generating linker command-lines, CMake now avoids repeating
items corresponding to SHARED library targets.
* Support for the Open Watcom compiler has been overhauled.
The :variable:`CMAKE_<LANG>_COMPILER_ID` is now ``OpenWatcom``,
and the :variable:`CMAKE_<LANG>_COMPILER_VERSION` now uses
the Open Watcom external version numbering. The external
version numbers are lower than the internal version number
by 11.
* The ``cmake-mode.el`` major Emacs editing mode no longer
treats ``_`` as part of words, making it more consistent
with other major modes.