向 CMake 生成的构建系统本身添加依赖项 [英] Add dependency to the CMake-generated build-system itself

问题描述

简而言之:我知道如何在 CMake 生成的构建系统中向目标添加依赖项.但我想为生成的构建系统本身添加依赖项.

In short: I know how to add dependencies to targets, in a CMake-generated build system. But I would like to add dependencies to the generated build-system itself.

更长的问题:在cgal，我们希望 CMake 在修改某些文件时自动重新运行配置步骤.不需要的细节隐藏在下面:

Longer question: In the CMake-generated build process of cgal, we would like CMake to automatically re-run the configuration step, when certain files are modified. Unneeded details are hidden below:

事实上，我们使用 CMake 生成 CGAL 库/示例/演示的构建系统，同时也是 Doxygen 生成的文档的构建系统.Doxyfile 由多个文件生成.

当CMake生成器为Makefile"时，Makefile中有一个特殊的target，名为rebuild_cache，但是那个target(在 Makefile 级别)不是 CMake 目标.无论如何，我正在寻找一种跨平台的解决方案，即:可用于所有 CMake 生成器.我的印象是，我想要的东西还不能用 CMake 实现.能否请您确认一下，以便我可以填写记录在案的功能请求?

When the CMake generator is "Makefile", there is a special target in the Makefile, that is named rebuild_cache, but that target (at the Makefile level) is not a CMake-target. And anyway, I look for a solution that is cross-platform, that is: usable with all CMake generators. I have the impression that what I want is not yet doable with CMake. Can you please confirm, so that I can fill a documented feature-request?

推荐答案

从 CMake 3.0 开始，您可以将这样的文件添加到目录属性 CMAKE_CONFIGURE_DEPENDS.此属性包含文件列表；如果其中任何一个发生变化，CMake 将触发重新配置.

Since CMake 3.0, you can add such a file to the directory property CMAKE_CONFIGURE_DEPENDS. This property holds a list of files; if any of them changes, CMake will trigger re-configuration.

这是一个小例子.假设您的 Doxyfile 是从当前源目录中的 Doxyfile.in.1 和 Doxyfile.in.2 生成的，则可以像这样使用该属性这个:

Here is a small example. Assuming your Doxyfile is generated from Doxyfile.in.1 and Doxyfile.in.2 in the current source directory, the property could be used like this:

set_property(
  DIRECTORY 
  APPEND 
  PROPERTY CMAKE_CONFIGURE_DEPENDS 
  Doxyfile.in.1
  Doxyfile.in.2
)

<小时>

如果您使用的是 CMake 2.x，则属性 CMAKE_CONFIGURE_DEPENDS 不可用，但您可以使用以下技巧:

---

If you're using CMake 2.x, the property CMAKE_CONFIGURE_DEPENDS is not available, but you can use the following trick:

通过configure_file() 传递文件，即使您只是COPYONLY 将它们放在某个地方并且不使用生成的副本.configure_file() 准确地引入了您正在寻找的构建系统依赖项.

Pass the files through configure_file(), even if you just COPYONLY them someplace and don't use the resulting copies. configure_file() introduces precisely the buildsystem dependency you're looking for.

这有效，但它增加了复制文件的开销.

This works, but it adds the overhead of copying the file.

_{(注意:这个技巧也是这个答案的原始内容，因为我在回答时不知道CMAKE_CONFIGURE_DEPENDS).}

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