Cmake include_directories 头文件问题

Question

问题

我想要在子目录thrid_library中添加第三方库，使得项目整体如下
./
./main.cpp
./CMakeLists.txt
.
./thrid_library/libA(libA库自带CMakeLists.txt)
./thrid_library/CMakeLists.txt

对于项目根CMakeLists.txt我是这么写的:

# ... ...
add_subdirectory(thrid_library)
# ... ...

对于thrid_library的CMakeLists.txt我是这么写的:

add_subdirectory(libA)
include_directories(libA)

make之后报错，没找到libA的头文件, 我将include_direstories(libA)删掉，在根CMakeLists.txt中添加
include_direstories(third_library/libA) 才编译成功。

实际的需求

可是，我真的不想include_direstories出现在根CMakeLists.txt，我应该怎么做?

Answer 1

你可以使用target_include_directories()只给使用libA的target添加相应的头文件搜索路径
https://cmake.org/cmake/help/latest/command/target_include_directories.html#command:target_include_directories