自动化构建系统 CMake 3.12 发布，包含重要变化

内容简介：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...

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.

【声明】文章转载自：开源中国社区 [http://www.oschina.net]

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