如何检查目标是否已添加？ [英] How to check whether a target has been added or not?

问题描述

假设我有一个cmake宏，可以根据某些条件添加目标（库或可执行文件）

Assume I have a cmake macro that adds target (library or executable) based on some conditions

macro (conditionally_add target_name target_src condition)
  if (condition)
    add_library (target_name target_src)
  endif ()
endmacro()

我的问题是，调用此函数后

My question is, after calling this function

conditionally_add (mylib mysrc.cc ${some_condition})

如何检查是否已添加库？更具体地说，我想在以下地方做一些事情

How can I check whether the library has been added? More specifically, I'd like to do something below

if (my_lib_is_added)    # HOW TO DO THIS?
  # Do something.
endif ()

推荐答案

使用<$ if 命令的c $ c> TARGET 子句：

Use the TARGET clause of the if command:

conditionally_add (mylib mysrc.cc ${some_condition})
if (TARGET mylib)
  # Do something when target found
endif()

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