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Changes made since CMake 3.14 include the following. New Features ============ Generators ---------- * The "Xcode" generator now supports per-target schemes. See the "CMAKE_XCODE_GENERATE_SCHEME" variable and "XCODE_GENERATE_SCHEME" target property. * The "Green Hills MULTI" generator has been updated: * It now supports the "add_custom_command()" and "add_custom_target()" commands. * It is now available on Linux. Languages --------- * Preliminary support for the "Swift" language was added to the "Ninja" generator: * Use the "SWIFTC" environment variable to specify a compiler. * The "Swift_DEPENDENCIES_FILE" target property and "Swift_DEPENDENCIES_FILE" source file property were added to customize dependency files. * The "Swift_MODULE_NAME" target property was added to customize the Swift module name. * The "Swift_DIAGNOSTICS_FILE" source property was added to indicate where to write the serialised Swift diagnostics. The Swift support is experimental, not considered stable, and may change in future releases of CMake. Compilers --------- * The "Clang" compiler variant on Windows that targets the MSVC ABI but has a GNU-like command line is now supported. * Support for the Clang-based ARM compiler was added with compiler id "ARMClang". * Support was added for the IAR compiler architectures Renesas RX, RL78, RH850 and Texas Instruments MSP430. * Support was added for the IAR compilers built for Linux (IAR BuildLx). Command-Line ------------ * The "CMAKE_GENERATOR" environment variable was added to specify a default generator to use when "cmake(1)" is run without a "-G" option. Additionally, environment variables "CMAKE_GENERATOR_PLATFORM", "CMAKE_GENERATOR_TOOLSET", and "CMAKE_GENERATOR_INSTANCE" were created to configure the generator. * The "cmake(1)" "--build" tool "--target" parameter gained support for multiple targets, e.g. "cmake --build . --target Library1 Library2". It now also has a short form "-t" alias, e.g. "cmake --build . -t Library1 Library2". * The "cmake(1)" command gained a new "--install" option. This may be used after building a project to run installation without using the generated build system or the native build tool. * The "cmake(1)" command learned a new CLI option "--loglevel". * The "cmake(1)" "-E remove_directory" command-line tool learned to support removing multiple directories. * The "cmake(1)" "-E tar" tool has been improved: * It now continues adding files to an archive even if some of the files are not readable. This behavior is more consistent with the classic "tar" tool. * It now parses all flags, and if an invalid flag was provided, a warning is issued. * It now displays an error if no action flag was specified, along with a list of possible actions: "t" (list), "c" (create) or "x" (extract). * It now supports extracting ("-x") or listing ("-t") only specific files or directories. * It now supports Zstandard compression with a "--zstd" option. Zstandard was designed to give a compression ratio comparable to that of the DEFLATE (zip) algorithm, but faster, especially for decompression. Commands -------- * The "add_custom_command()" and "add_custom_target()" commands gained a new "JOB_POOL" option that works with the "Ninja" generator to set the pool variable on the build statement. * The "add_library()" command "ALIAS" option learned to support import libraries of the "UNKNOWN" type. * The "cmake_parse_arguments()" command gained an additional "_KEYWORDS_MISSING_VALUES" output variable to report keyword arguments that were given by the caller with no values. * The "execute_process()" command gained a "COMMAND_ECHO" option and supporting "CMAKE_EXECUTE_PROCESS_COMMAND_ECHO" variable to enable echoing of the command-line string before execution. * The "file(INSTALL)" command learned a new argument, "FOLLOW_SYMLINK_CHAIN", which can be used to recursively resolve and install symlinks. * "list()" learned new sub-commands: "PREPEND", "POP_FRONT" and "POP_BACK". * The "message()" command learned new types: "NOTICE", "VERBOSE", "DEBUG" and "TRACE". * The "string()" learned a new sub-command "REPEAT". Variables --------- * The "CMAKE_CROSSCOMPILING_EMULATOR" variable and corresponding "CROSSCOMPILING_EMULATOR" target property learned to support arguments to the emulator. * The "CMAKE_FIND_PACKAGE_PREFER_CONFIG" variable was added to tell "find_package()" calls to look for a package configuration file first even if a find module is available. * The "CMAKE_FRAMEWORK" variable was added to initialize the "FRAMEWORK" property on all targets. * The "CMAKE_VS_JUST_MY_CODE_DEBUGGING" variable and "VS_JUST_MY_CODE_DEBUGGING" target property were added to enable the Just My Code feature of the Visual Studio Debugger when compiling with MSVC cl 19.05 and higher. * The "CMAKE_MSVC_RUNTIME_LIBRARY" variable and "MSVC_RUNTIME_LIBRARY" target property were introduced to select the runtime library used by compilers targeting the MSVC ABI. See policy "CMP0091". * The "CMAKE_PROJECT_INCLUDE" and "CMAKE_PROJECT_INCLUDE_BEFORE" variables were added to allow injection of custom code at the sites of "project()" calls without knowing the project name a priori. Properties ---------- * The "ADDITIONAL_CLEAN_FILES" target property and "ADDITIONAL_CLEAN_FILES" directory property were added. They allow to register additional files that should be removed during the clean stage. * The "PUBLIC_HEADER" and "PRIVATE_HEADER" properties may now be set on Interface Libraries. The headers specified by those properties can be installed using the "install(TARGETS)" command by passing the "PUBLIC_HEADER" and "PRIVATE_HEADER" arguments respectively. * The "VS_PACKAGE_REFERENCES" target property was added to tell Visual Studio Generators to add references to "nuget" packages. * The "VS_PROJECT_IMPORT" target property was added to allow managed Visual Studio project files to import external ".props" files. * The "VS_NO_SOLUTION_DEPLOY" target property was added to tell Visual Studio Generators whether to deploy an artifact to the WinCE or Windows Phone target device. Modules ------- * The "FindBoost" module was reworked to expose a more consistent user experience between its “Config” and “Module” modes and with other find modules in general. * A new imported target "Boost::headers" is now defined (same as "Boost::boost"). * New output variables "Boost_VERSION_MACRO", "Boost_VERSION_MAJOR", "Boost_VERSION_MINOR", "Boost_VERSION_PATCH", and "Boost_VERSION_COUNT" were added. * The "QUIET" argument passed to "find_package()" is no longer ignored in config mode. Note that the CMake package shipped with Boost "1.70.0" ignores the "QUIET" argument passed to "find_package()". This is fixed in the next Boost release. * The input switch "Boost_DETAILED_FAILURE_MSG" was removed. * "Boost_VERSION" now reports the version in "x.y.z" format in module mode. See policy "CMP0093". * The "FindCups" module now provides imported targets. * The "FindEnvModules" module was added to use Lua- and TCL-based environment modules in CTest Scripts. * The "FindGLEW" module now provides an interface more consistent with what upstream GLEW provides in its own CMake package files. * The "FindPkgConfig" now populates "INTERFACE_LINK_OPTIONS" property of imported targets with other (non-library) linker flags. * The "FindPostgreSQL" module learned to find debug and release variants separately. * Modules "FindPython3", "FindPython2" and "FindPython" gained additional lookup strategies and controls, and a new default. See policy "CMP0094". * Modules "FindPython", "FindPython2" and "FindPython3" gain a new target (respectively "Python::Module", "Python2::Module" and "Python3::Module") which can be used to develop Python modules. * Modules "FindPython3", "FindPython2" and "FindPython" gain capability to control how virtual environments are handled. * The "UseSWIG" module learned to manage alternate library names by passing "-interface " for "python" language or "-dllimport " for "CSharp" language to the "SWIG" compiler. Generator Expressions --------------------- * The "generator expressions" "C_COMPILER_ID", "CXX_COMPILER_ID", "CUDA_COMPILER_ID", "Fortran_COMPILER_ID", "COMPILE_LANGUAGE", "COMPILE_LANG_AND_ID", and "PLATFORM_ID" learned to support matching one value from a comma-separated list. CTest ----- * The "ctest_submit()" command learned a new option: "BUILD_ID". This can be used to store the ID assigned to this build by CDash to a variable. * The "ctest_update()" command learned to honor a new variable: "CTEST_UPDATE_VERSION_OVERRIDE". This can be used to specify the current version of your source tree rather than using the update command to discover the current version that is checked out. CPack ----- * The "CPack IFW Generator" gained a new "CPACK_IFW_PACKAGE_STYLE_SHEET" variable to customize the installer stylesheet. Deprecated and Removed Features =============================== * The "cmake-server(7)" mode has been deprecated and will be removed from a future version of CMake. Please port clients to use the "cmake-file-api(7)" instead. * The "ADDITIONAL_MAKE_CLEAN_FILES" directory property is now deprecated. Use the "ADDITIONAL_CLEAN_FILES" directory property instead. * The variable "CMAKE_AUTOMOC_RELAXED_MODE" is considered deprecated. Support still exists but will be removed in future versions. * The "export(PACKAGE)" command now does nothing unless enabled via "CMAKE_EXPORT_PACKAGE_REGISTRY". See policy "CMP0090". * The "Xcode" generator now requires at least Xcode 5. * An explicit deprecation diagnostic was added for policy "CMP0066" ("CMP0065" and below were already deprecated). The "cmake- policies(7)" manual explains that the OLD behaviors of all policies are deprecated and that projects should port to the NEW behaviors. Other Changes ============= * CMake learned how to compile C++14 with the IBM AIX XL compiler and the SunPro compiler and to compile C++20 with the AppleClang compiler. * With MSVC-like compilers the value of "CMAKE__FLAGS" no longer contains warning flags like "/W3" by default. See policy "CMP0092". * IBM Clang-based XL compilers that define "__ibmxl__" now use the compiler id "XLClang" instead of "XL". See policy "CMP0089". * The "file(REMOVE)" and "file(REMOVE_RECURSE)" commands were changed to ignore empty arguments with a warning instead of treating them as a relative path and removing the contents of the current directory. ---------------------------------------------------------------------------- Changes made since CMake 3.15.0-rc4: Brad King (2): VS: Fix SBCS support for object libraries CMake 3.15.0 Brian Carlson (1): FindBISON: Fix CMP0088 NEW behavior for non-absolute input paths Cristian Adam (1): find_package: Fix NO_MODULE under CMAKE_FIND_PACKAGE_PREFER_CONFIG Willem Deconinck (2): Fortran: Support compilers using no module prefix on submodule files Fortran: Add support for submodules on Cray