cmake - include_directories 的默认隐私/范围设置是什么？

Question

我了解 target_include_directories() 可以与 PUBLIC、INTERFACE 或 PRIVATE 结合使用以指定目录的范围或隐私。但是很多过时的代码仍然使用 include_directories() ，而且我不确定使用它们的目标如何处理这些目录。

使用 include_directories() 与使用 target_include_directories(MyTarget PRIVATE ...) 本质上是一样的吗？我看过this类似的问题，但是 include_directories() 是否也没有默认范围行为？

Answer 1

Is using include_directories() essentially the same as using target_include_directories(MyTarget PRIVATE ...)?

是的，对于受 include_directories 影响的每个目标(即在当前CMakeLists.txt及以下)，与PRIVATE具有相同的效果命令的目标特定版本中的关键字。

---

Documentation对于 include_directories说，该命令分配 INCLUDE_DIRECTORIES目标和目录的属性:

The include directories are added to the INCLUDE_DIRECTORIES directory property for the current CMakeLists file. They are also added to the INCLUDE_DIRECTORIES target property for each target in the current CMakeLists file.

和目录属性affects在进一步的目标上:

This property is used to populate the INCLUDE_DIRECTORIES target property.

正是INCLUDE_DIRECTORIES目标属性(property) is affected通过 PRIVATE target_include_directories的关键词命令:

PRIVATE and PUBLIC items will populate the INCLUDE_DIRECTORIES property of <target>. PUBLIC and INTERFACE items will populate the INTERFACE_INCLUDE_DIRECTORIES property of <target>.