cmake find_package 中，include_directories，target_link_libraries 的值怎么知道？

拿Sophus库为例：

find_package(Sophus REQUIRED)

include_directories(${Sophus_INCLUDE_DIRS})

target_link_libraries(useSophus ${Sophus_LIBRARIES})

我们怎么知道要连接Sophus_INCLUDE_DIRS，Sophus_LIBRARIES，而不是SOPHUS_INCLUDE_DIRS，SOPHUS_LIBRARIES或其他，其实

find_package主要是找到.cmake文件，然后这些变量在.cmake 里面定义了，我们看Sophus/SophusConfig.cmake：

# Sophus source dir

set( Sophus_SOURCE_DIR "/home/xxx/slamcode/ch4/Sophus")

################################################################################

# Sophus build dir

set( Sophus_DIR "/home/xxx/slamcode/ch4/Sophus")

################################################################################

set( Sophus_INCLUDE_DIR  "/home/xxx/slamcode/ch4/Sophus;/usr/include/eigen3" )

set( Sophus_INCLUDE_DIRS  "/home/xxx/slamcode/ch4/Sophus;/usr/include/eigen3" )

set( Sophus_LIBRARIES    "/home/xxx/slamcode/ch4/Sophus/libSophus.so" )

set( Sophus_LIBRARY      "/home/xxx/slamcode/ch4/Sophus/libSophus.so" )

set( Sophus_LIBRARY_DIR  "/home/xxx/slamcode/ch4/Sophus" )

set( Sophus_LIBRARY_DIRS "/home/xxx/slamcode/ch4/Sophus" )

然后就知道那些变量可以用了吧