CMake 3.29 Release Notes
************************

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Changes made since CMake 3.28 include the following.

New Features
============

Command-Line
------------

* :manual:`cmake(1)` :option:`-E cat <cmake-E cat>` can now print the standard
  input by passing the ``-`` argument.

Generators
----------

* :ref:`Visual Studio Generators` now support selecting between the
  Intel oneAPI Fortran compiler (``ifx``) and the Intel classic Fortran
  compiler (``ifort``) using a ``fortran=`` field in
  :variable:`CMAKE_GENERATOR_TOOLSET`.

File-Based API
--------------

* The :manual:`cmake-file-api(7)` "codemodel" version 2 ``version`` field has
  been updated to 2.7.

* The :manual:`cmake-file-api(7)` "codemodel" version 2 "target" object gained
  a new "launchers" field.

Compilers
---------

* The LLVM/Clang GNU-like frontend on Windows (``clang++``) may now be used
  to compile ``CUDA`` language sources.

* Compilers targeting the GNU ABI on Windows (MinGW) may now be used to
  compile Objective C (``OBJC``) and Objective C++ (``OBJCXX``).  These
  include GNU compilers (``gcc`` and ``g++``) and the LLVM/Clang GNU-like
  frontends (``clang`` and ``clang++``).

* TI Clang-based compilers are now supported with
  :variable:`compiler id <CMAKE_<LANG>_COMPILER_ID>` ``TIClang``.

Commands
--------

* The :ref:`add_custom_command(TARGET) <add_custom_command(TARGET)>`
  signature now supports adding build events through :ref:`Alias Targets`.

* The :command:`cmake_language(EXIT)` sub-command was added to terminate
  :option:`cmake -P` scripts with a specified exit code.

* The :command:`export(SETUP)` sub-command was added to configure export sets.
  Its ``TARGET`` option's ``XCFRAMEWORK_LOCATION`` setting specifies the
  location of a ``.xcframework`` that can be substituted for an installed
  target.

* The :command:`if` command gained new tests ``IS_READABLE``, ``IS_WRITABLE``
  and ``IS_EXECUTABLE`` to check file or directory permissions.

Variables
---------

* The :envvar:`CMAKE_INSTALL_PREFIX` environment variable was added to
  provide a default value for the :variable:`CMAKE_INSTALL_PREFIX` variable.

* The :variable:`CMAKE_LINKER_TYPE` variable and corresponding
  :prop_tgt:`LINKER_TYPE` target property were added to specify
  what linker to use with some toolchains.

* The :variable:`CMAKE_<LANG>_COMPILER_LINKER`,
  :variable:`CMAKE_<LANG>_COMPILER_LINKER_ID`,
  :variable:`CMAKE_<LANG>_COMPILER_LINKER_VERSION` and
  :variable:`CMAKE_<LANG>_COMPILER_LINKER_FRONTEND_VARIANT` variables
  were added to describe the linker used by the language's link step.

* The :variable:`CMAKE_PROJECT_INCLUDE`,
  :variable:`CMAKE_PROJECT_INCLUDE_BEFORE`,
  :variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE`, and
  :variable:`CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE` variables learned
  to support a :ref:`semicolon-separated list <CMake Language Lists>` of
  CMake language files to be included sequentially. These variables can also
  reference module names to be found in :variable:`CMAKE_MODULE_PATH` or
  builtin to CMake.

* The :variable:`CMAKE_SKIP_TEST_ALL_DEPENDENCY` variable was added
  to control whether the ``test`` (or ``RUN_TESTS``) buildsystem
  target depends on the ``all`` (or ``ALL_BUILD``) target.

* A :variable:`CMAKE_TEST_LAUNCHER` variable and corresponding
  :prop_tgt:`TEST_LAUNCHER` target property were added to specify
  a launcher to be used by executable targets when invoked by
  tests added by the :command:`add_test` command.

Properties
----------

* The :prop_tgt:`CROSSCOMPILING_EMULATOR` target property now
  supports :manual:`generator expressions <cmake-generator-expressions(7)>`.

* The :prop_tgt:`UNITY_BUILD` target property now supports the
  Objective C (``OBJC``) and Objective C++ (``OBJCXX``) languages.

* The :prop_tgt:`XCODE_EMBED_XPC_SERVICES <XCODE_EMBED_<type>>` target property
  was added to tell the :generator:`Xcode` generator what targets to put in
  the ``Embed XPC Resources`` build phase.

Modules
-------

* The :module:`CMakePackageConfigHelpers` module gained new
  :command:`generate_apple_platform_selection_file` and
  :command:`generate_apple_architecture_selection_file` functions, which can
  be used to generate a file that includes another Apple-platform-specific
  file or the includes an architecture-specific implementation of a package
  for an Apple platform, respectively.

* The :module:`FindOpenGL` module learned to find a GLU include
  directory different than the GL include directory.  A new
  ``OPENGL_INCLUDE_DIRS`` result variable provides all include
  directories.

CTest
-----

* :manual:`ctest(1)` gained a :option:`--http-header <ctest --http-header>`
  option to add custom headers on submission to CDash.

* :manual:`ctest(1)` gained the :option:`--tests-from-file <ctest
  --tests-from-file>` and :option:`--exclude-from-file <ctest
  --exclude-from-file>` options to run or exclude tests named in a file.

* :manual:`ctest(1)` now supports :ref:`job server integration
  <ctest-job-server-integration>` on POSIX systems.

* The :option:`ctest -j` option may now be given without a value to let
  ctest choose a default level of parallelism, or with ``0`` to let ctest
  use unbounded parallelism.  The corresponding :envvar:`CTEST_PARALLEL_LEVEL`
  environment variable, if set to the empty string, is now equivalent to
  passing ``-j`` with no value.

* The :command:`ctest_test` command gained options
  ``INCLUDE_FROM_FILE`` and ``EXCLUDE_FROM_FILE`` to run or exclude
  tests named in a file.

CPack
-----

* The :cpack_gen:`CPack DEB Generator` :variable:`CPACK_DEBIAN_FILE_NAME`
  variable may now be set without any suffix, and the ``.deb`` suffix
  will be added automatically.

* The :cpack_gen:`CPack RPM Generator` :variable:`CPACK_RPM_FILE_NAME`
  variable may now be set without any suffix, and the ``.rpm`` suffix
  will be added automatically.

* The :cpack_gen:`CPack WIX Generator` gained a new variable,
  :variable:`CPACK_WIX_INSTALL_SCOPE`, to control the
  ``InstallScope`` property of WiX MSI installers.

Other Changes
=============

* CMake learned to de-duplicate libraries on link lines based on linker
  capabilities.  See policy :policy:`CMP0156`.

* The :command:`add_test` command now honors
  :variable:`CMAKE_CROSSCOMPILING_EMULATOR` only when cross-compiling.
  See policy :policy:`CMP0158`.

* On Windows, when targeting the MSVC ABI, the :command:`find_library` command
  now accepts ``.a`` file names after first considering ``.lib``.  This is
  symmetric with existing behavior when targeting the GNU ABI, in which the
  command accepts ``.lib`` file names after first considering ``.a``.

* On Windows, when targeting the MSVC ABI, the :command:`find_library` command
  now considers ``.dll.lib`` file names before ``.lib``.  This is the default
  suffix for DLL import libraries created by Rust toolchains for the MSVC ABI.

* The :generator:`Ninja` and :generator:`NMake Makefiles` generators now use
  the ``-external:I`` flag for system includes when using IntelLLVM as of
  version 2021.4. The ``-external:W0`` flag is also used as of version 2022.2.

* The :command:`create_test_sourcelist` command now provides a full path to
  the generated driver source file.

* The :variable:`CPACK_PRODUCTBUILD_DOMAINS` variable now defaults to true.
  See policy :policy:`CMP0161`.

Updates
=======

Changes made since CMake 3.29.0 include the following.

3.29.1
------

* The :variable:`CMAKE_LINKER_TYPE` variable and corresponding
  :prop_tgt:`LINKER_TYPE` target property now work with compilers
  for the ``Swift`` language.

3.29.2, 3.29.3, 3.29.4
----------------------

* These versions made no changes to documented features or interfaces.
  Some implementation updates were made to support ecosystem changes
  and/or fix regressions.

3.29.5
------

* The :cpack_gen:`CPack WIX Generator`'s :variable:`CPACK_WIX_INSTALL_SCOPE`
  variable, new in 3.29, now defaults to ``NONE``.  This restores
  compatibility with behavior of 3.28 and below: without a custom WiX
  template, it produces installers that only create start menu and
  uninstall entries for the current user, even though they install
  for all users.

  In 3.29.0 through 3.29.4, ``CPACK_WIX_INSTALL_SCOPE`` defaulted to
  ``perMachine``.  This created MSI installers that create start menu
  and uninstall entries for all users by default.  While this behavior
  is better on its own, these installers do not cleanly replace existing
  installations created with MSI installers produced by 3.28 and below.
  3.29.5 reverts the default for compatibility.  Projects may transition
  to ``perMachine`` on their own schedule by setting
  ``CPACK_WIX_INSTALL_SCOPE``.
