catkin_make编译问题--Project 'B' tried to find library 'A'. The library is neither a target nor built/installed properly.

CMake Error at /home/sany/WorkSpace/test_ws/devel/share/A/cmake/AConfig.cmake:173 (message):
  Project 'B' tried to find library 'A'.  The library is neither a target nor
  built/installed properly.  Did you compile project 'A'? Did you
  find_package() it before the subdirectory containing its code is included?
Call Stack (most recent call first):
  /opt/ros/noetic/share/catkin/cmake/catkinConfig.cmake:76 (find_package)
  B/CMakeLists.txt:10 (find_package)　　

在编译的时候遇到上述错误，复现方法如下：

1.  创建ros的A包：

catkin_create_pkg A rospy roscpp

修改 A包的CMakeLists.txt，表示A包提供头文件INCLUDE_DIRS和LIBRARIES A给其他包依赖。

catkin_package(
  INCLUDE_DIRS include
  LIBRARIES A
#  CATKIN_DEPENDS geometry_msgs nav_msgs roscpp rospy std_msgs task_manager tf2
#  DEPENDS system_lib
)

2. 创建ros的B包：

catkin_create_pkg B rospy roscpp A

3. catkin_make，即得到上述错误。

原因分析：

A包输出了并不存在的库（LIBRARIES A)，导致B包find_package()在寻找A库的时候无法找到。

当去掉LIBRARIES A的时候，find_package（）将不会寻找LIBRARIES A，因此CMAKE配置通过。