target_link_libraries和add_dependencies

问题描述

是否有任何用例

  target_link_libraries（my-lib xyz）
 
 add_dependencies （my-lib x）＃这不只是浪费字节吗？ 
  

如果是这样，有人可以解释一下吗？

解决方案

在当前的CMake版本中：

检查 add_dependencies 导致调用。 x 已添加到 my-lib 。

target_link_libraries 不会导致调用 AddUtility ，但它会将参数添加到目标属性。

稍后， LINK_LIBRARIES 目标属性和实用程序列表的内容都用于计算。

目标中的实用程序列表无法在配置时查询，只有在生成时使用，因此使用 add_dependencies 的参数是已经添加了 target_link_libraries 的库是多余的。 / p>

Is there any use case in which

target_link_libraries(my-lib x y z)

add_dependencies(my-lib x) # this is not just a waste of bytes?

If so, can someone explain what it would be?

解决方案

In current CMake releases:

After some error checking add_dependencies results in a call to Target->AddUtility(). x is added to the list of utilities for my-lib.

target_link_libraries does not result in a call to AddUtility, but it does add the arguments to the LINK_LIBRARIES target property.

Later, both the content of the LINK_LIBRARIES target property and the list of utilities are used to compute the dependencies of the target in cmComputeTargetDepends.

The list of utilities in a target can not be queried at configure time, and is only used at generate time, so the use of add_dependencies with arguments which are libraries already added with target_link_libraries is redundant.

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