当两个子目录引用同一库时，如何正确编写cmake文件？
我有这样的目录结构
external/
loglib/
subdir1/
CMakeList.txt // link with loglib
subdir2/
CMakeList.txt // link with loglib , the same loglib.
main.cc
CMakeList.txt // link with subdir1 subdir2 as if they are isolated libs
将loglib因此而重复？这样做的最佳做法是什么？我是否应该将功能仅在主cmakefile下（只能链接loglib一次），然后忘记诸如addSubDirectory之类的隔离？
I have a directory structure like this
external/
loglib/
subdir1/
CMakeList.txt // link with loglib
subdir2/
CMakeList.txt // link with loglib , the same loglib.
main.cc
CMakeList.txt // link with subdir1 subdir2 as if they are isolated libs
will loglib be duplicated as a consequence of this? what's the best practice to do this? should i just combine the functionality under the main CMakefile (which will only link loglib once ) and forget about isolation such as addsubdirectory?
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