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自动化构建系统 CMake 3.12 发布,包含重要变化

CMake 3.12.0 现已发布 ,下载地址为 https://cmake.org/download/

文档:https://cmake.org/cmake/help/v3.12
发布说明:https://cmake.org/cmake/help/v3.12/release/3.12.html

CMake 3.12 包含不少重要的变化:

  • The “target_link_libraries()” command now supports Object Libraries. Linking to an object library uses its object files in direct dependents and also propagates usage requirements.
  • The “file(GLOB)” and “file(GLOB_RECURSE)” commands learned a new flag “CONFIGURE_DEPENDS” which enables expression of build system dependency on globbed directory’s contents.
  • The “Compile Features” functionality is now aware of C++ 20. No specific features are yet enumerated besides the “cxx_std_20” meta-feature.
  • The Visual Studio Generators for VS 2017 learned to support a “version=14.##” option in the “CMAKE_GENERATOR_TOOLSET” value (e.g. via the “cmake(1)” “-T” option) to specify a toolset version number.
  • The “cmake(1)” Build Tool Mode (“cmake –build”) gained “– parallel [<jobs>]” and “-j [<jobs>]” options to specify a parallel build level. They map to corresponding options of the native build tool.
  • The “add_compile_definitions()” command was added to set preprocessor definitions at directory level. This supersedes “add_definitions()”.
  • The “cmake_minimum_required()” and “cmake_policy(VERSION)” commands now accept a version range using the form “<min>[…<max>]”. The “<min>” version is required but policies are set based on the “<max>” version. This allows projects to specify a range of versions for which they have been updated and avoid explicit policy settings.
  • The “find_package()” command now searches a prefix specified by a “PackageName_ROOT” CMake or environment variable. Package roots are maintained as a stack so nested calls to all “find_*” commands inside find modules also search the roots as prefixes. See policy “CMP0074”.
  • A new “$<GENEX_EVAL:…>” and “$<TARGET_GENEX_EVAL:target,…>” “generator expression” has been added to enable consumption of generator expressions whose evaluation results itself in generator expressions.
  • A new “$<TARGET_EXISTS:…>” “generator expression” has been added.
  • A new “$<TARGET_NAME_IF_EXISTS:…>” “generator expression” has been added.
  • The “FindCURL” module now provides imported targets.
  • The “FindJPEG” module now provides imported targets.
  • A “FindODBC” module was added to find an Open Database Connectivity (ODBC) library.
  • New “FindPython3” and “FindPython2” modules, as well as a new “FindPython” module, have been added to provide a new way to locate python environments.

转自 https://www.oschina.net/news/98097/cmake-3-12-0-released

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