`-H.` 选项对 CMake 意味着什么? [英] What does the `-H.` option means for CMake?

问题描述

此答案在 CMake 上的前一个问题中显示了此命令行:

This answer to a former question on CMake shows this command line:

cmake -H. -Bbuild -G "MSYS Makefiles"

-H. 选项在这里执行什么任务?cmake --help 说 -H 打印帮助...

What task does the -H. option perform here? cmake --help says that -H prints the help...

我使用的是 CMake 3.2.3.

I am using CMake 3.2.3.

推荐答案

如链接的答案中所述，它是一个未公开的选项，但查看源代码会发现其效果:

As mentioned in the linked answer, it is an undocumented option, but looking at the source code reveals its effect:

在 cmake::SetArgs():

if(arg.find("-H",0) == 0)
  {    
  directoriesSet = true;
  std::string path = arg.substr(2);
  path = cmSystemTools::CollapseFullPath(path);
  cmSystemTools::ConvertToUnixSlashes(path);
  this->SetHomeDirectory(path);

最后一个调用，SetHomeDirectory 实际上设置了项目的源目录.-B 选项(也未公开)依次设置二进制目录.

The last call, SetHomeDirectory actually sets the source directory for the project. The -B option (also undocumented) in turn sets the binary directory.

如果没有设置这些选项，二进制目录将是当前执行cmake的文件夹，源目录可以作为位置参数给出(如果没有找到，源文件夹也将是当前工作目录).

If these options are not set, the binary directory will be the current folder where cmake is executed, and the source directory can be given as a positional argument (if not found, the source folder will also be the current working directory).

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