CMake 3.29.0-rc2 is ready for testing

Announcements
1

I am proud to announce the second CMake 3.29 release candidate.
https://cmake.org/download/

Documentation is available at:
https://cmake.org/cmake/help/v3.29

Release notes appear below and are also published at
https://cmake.org/cmake/help/v3.29/release/3.29.html

Release milestone is available at:
https://gitlab.kitware.com/cmake/cmake/-/milestones/136

Some of the more significant changes in CMake 3.29 are:

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

  • TI Clang-based compilers are now supported with compiler id
    “TIClang”.

  • The “cmake_language(EXIT)” sub-command was added to terminate “cmake
    -P” scripts with a specified exit code.

  • The “export(SETUP)” sub-command was added to configure export sets.
    Its “PACKAGE_DEPENDENCY” option configures how “find_dependency()”
    calls are exported. Its “TARGET” option’s “XCFRAMEWORK_LOCATION”
    setting specifies the location of a “.xcframework” that can be
    substituted for an installed target.

  • “install(EXPORT)” and “export(EXPORT)” learned a new
    “EXPORT_PACKAGE_DEPENDENCIES” argument, which can be used to
    generate “find_dependency()” calls based on what targets the
    exported targets depend on.

  • The “CMAKE_LINKER_TYPE” variable and corresponding “LINKER_TYPE”
    target property were added to specify what linker to use with some
    toolchains.

  • A “CMAKE_TEST_LAUNCHER” variable and corresponding “TEST_LAUNCHER”
    target property were added to specify a launcher to be used by
    executable targets when invoked by tests added by the “add_test()”
    command.

CMake 3.29 Release Notes

Changes made since CMake 3.28 include the following.

New Features

Command-Line

  • “cmake(1)” “-E cat” can now print the standard input by passing the
    “-” argument.

Generators

  • 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
    “CMAKE_GENERATOR_TOOLSET”.

File-Based API

  • The “cmake-file-api(7)” “codemodel” version 2 “version” field has
    been updated to 2.7.

  • The “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 compiler id
    “TIClang”.

Commands

  • The add_custom_command(TARGET) signature now supports adding build
    events through Alias Targets.

  • The “cmake_language(EXIT)” sub-command was added to terminate “cmake
    -P” scripts with a specified exit code.

  • The “export(SETUP)” sub-command was added to configure export sets.
    Its “PACKAGE_DEPENDENCY” option configures how “find_dependency()”
    calls are exported. Its “TARGET” option’s “XCFRAMEWORK_LOCATION”
    setting specifies the location of a “.xcframework” that can be
    substituted for an installed target.

  • The “if()” command gained new tests “IS_READABLE”, “IS_WRITABLE” and
    “IS_EXECUTABLE” to check file or directory permissions.

  • “install(EXPORT)” and “export(EXPORT)” learned a new
    “EXPORT_PACKAGE_DEPENDENCIES” argument, which can be used to
    generate “find_dependency()” calls based on what targets the
    exported targets depend on.

Variables

  • The “CMAKE_INSTALL_PREFIX” environment variable was added to provide
    a default value for the “CMAKE_INSTALL_PREFIX” variable.

  • The “CMAKE_LINKER_TYPE” variable and corresponding “LINKER_TYPE”
    target property were added to specify what linker to use with some
    toolchains.

  • The “CMAKE_<LANG>_COMPILER_LINKER”,
    “CMAKE_<LANG>_COMPILER_LINKER_ID”,
    “CMAKE_<LANG>_COMPILER_LINKER_VERSION” and
    “CMAKE_<LANG>_COMPILER_LINKER_FRONTEND_VARIANT” variables were added
    to describe the linker used by the language’s link step.

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

  • The “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 “CMAKE_TEST_LAUNCHER” variable and corresponding “TEST_LAUNCHER”
    target property were added to specify a launcher to be used by
    executable targets when invoked by tests added by the “add_test()”
    command.

Properties

  • The “CROSSCOMPILING_EMULATOR” target property now supports
    “generator expressions”.

  • The “EXPORT_FIND_PACKAGE_NAME” target property was added to allow
    targets to specify what package name to pass when exporting
    “find_dependency()” calls. This property is initialized with a new
    “CMAKE_EXPORT_FIND_PACKAGE_NAME” variable.

  • The “UNITY_BUILD” target property now supports the Objective C
    (“OBJC”) and Objective C++ (“OBJCXX”) languages.

  • The “XCODE_EMBED_XPC_SERVICES” target property was added to tell the
    “Xcode” generator what targets to put in the “Embed XPC Resources”
    build phase.

Modules

  • The “CMakePackageConfigHelpers” module gained new
    “generate_apple_platform_selection_file()” and
    “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 “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

  • “ctest(1)” gained a “–http-header” option to add custom headers on
    submission to CDash.

  • “ctest(1)” gained the “–tests-from-file” and “–exclude-from-file”
    options to run or exclude tests named in a file.

  • “ctest(1)” now supports job server integration on POSIX systems.

  • The “ctest_test()” command gained options “INCLUDE_FROM_FILE” and
    “EXCLUDE_FROM_FILE” to run or exclude tests named in a file.

CPack

  • The “CPack DEB Generator” “CPACK_DEBIAN_FILE_NAME” variable may now
    be set without any suffix, and the “.deb” suffix will be added
    automatically.

  • The “CPack RPM Generator” “CPACK_RPM_FILE_NAME” variable may now be
    set without any suffix, and the “.rpm” suffix will be added
    automatically.

  • The “CPack WIX Generator” gained a new 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 “CMP0156”.

  • The “add_test()” command now honors “CMAKE_CROSSCOMPILING_EMULATOR”
    only when cross-compiling. See policy “CMP0158”.

  • “FetchContent_MakeAvailable()” now sets the
    “CMAKE_EXPORT_FIND_PACKAGE_NAME” variable for CMake projects.

  • On Windows, when targeting the MSVC ABI, the “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 “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 “Ninja” and “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 “create_test_sourcelist()” command now provides a full path to
    the generated driver source file.

  • The “CPACK_PRODUCTBUILD_DOMAINS” variable now defaults to true. See
    policy “CMP0161”.

  • The “CPack WIX Generator” now produces WiX MSI installers that
    create start menu and uninstall entries for all users by default, as
    documented by the “CPACK_WIX_INSTALL_SCOPE” variable “perMachine”
    value. Previously, without a custom WiX template, it produced
    installers that would only create start menu and uninstall entries
    for the current user, even though they install for all users.

Changes made since CMake 3.29.0-rc1:

Ben Boeckel (21):

  • cmDyndepCollation: collapse full path before looking up
  • Tests/CXXModules: support testing rebuild conditions
  • cxxmodules: return failure from the collator when private usage is found
  • Tests/CXXModules: test that objects depend on their modmap files
  • cxxmodules: depend on the modmap contents
  • cmNinjaTargetGenerator: use emplace_back for scanning deps
  • Tests/CXXModules: test that objects depend on dependent modules json files
  • cmNinjaTargetGenerator: scanning depends on the module metadata
  • Tests/CXXModules: add a test to ensure that restat works for collation
  • Ninja: make the collator rule use restat = 1
  • Tests/CXXModules: document CMake_TEST_MODULE_COMPILATION items
  • Tests/CXXModules: support building a project with Ninja
  • Tests/CXXModules: add a test importing from a Ninja install
  • cmGeneratorTarget: store synthetic targets in its cache
  • Tests/CXXModules: add a test with transitive targets
  • cmTarget: copy link libraries from the right properties
  • Tests/CXXModules: test transitive modules usage
  • cmExportFileGenerator: export link libraries as-is
  • cmGeneratorTarget: discover synthetic targets recursively
  • Tests/CXXModules: test cxx_std_20 coming from a dependency
  • Clang: detect -resource-dir for clang-scan-deps

Brad King (12):

  • Tests: Remove unnecessary RunCMake.cmake_language expected result files
  • cmake_language: Fix EXIT inside control flow blocks
  • librhash: aligned_alloc is not available with glibc < 2.15
  • Tests/CommandLength: Refactor test commands to reduce test run time
  • ci: update to WiX 3.14.0.8606 release
  • VS: Verify toolset version= field format more strictly
  • VS: Fix ‘-T version=14.40’ under VS 17.10 preview 1
  • Tests: Fix BuildDepends on macOS arm64 without rosetta
  • Help: Modernize BUILD_SHARED_LIBS documentation
  • Tests: Update RunCMake.TargetObjects cmake_minimum_required version
  • Restore support for TARGET_OBJECTS in link interfaces with unity builds
  • CMake 3.29.0-rc2

Craig Scott (1):

  • Help: Advise calling option(BUILD_SHARED_LIBS) early enough

Johannes Schultz (1):

  • Help: Fix example for return command

Robert Maynard (1):

  • Help: Explicitly discourage absolute install destinations

Ruslan Baratov (1):

  • IPO: Support duplicate object names in large archives