注意:现代CMake的解决方案比下面提到的更好(有关详细信息，请参阅更新).

您可以使用 CMAKE_SHARED_LINKER_FLAGS :

 设置(CMAKE_SHARED_LINKER_FLAGS"-Wl，按需") 

这个问题看起来像是相关的./p>

UPD
感谢@Bruce Adams指出，自v3.13以来，CMake具有特殊命令用于此目的: add_link_options .

UPD 2
感谢@Alex Reinking指出现代CMake不建议使用全局设置.建议优先考虑全局设置之前的属性设置，因此，应该使用 target_link_options 代替具有全局范围的 add_link_options .有关详细信息，请参见Alex的答案.

When linking a binary I can use CMAKE_EXE_LINKER_FLAGS to add a flag (let's say -Wl,-as-needed). However, if I link a library this extra flag will not be taken into account. I would need something like CMAKE_LIB_LINKER_FLAGS but I can't find it.

How should I do this?

Note: modern CMake has a better solution than mentioned below (see updates for details).

You can use CMAKE_SHARED_LINKER_FLAGS like:

set (CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed")

This question looks like related.

UPD
Thanks to @Bruce Adams who points out that since v3.13 CMake has special command for such purpose: add_link_options.

UPD 2
Thanks to @Alex Reinking who points out that modern CMake doesn't recommend using global settings. It is suggested to give the preference to the property settings before the global ones, so instead of add_link_options that has a global scope, the target_link_options should be used. See Alex's answer for details.