Mac 编译报错 Undefined symbols for architecture x86_64

问题描述

使用cmake编译项目时，报错内容为

Undefined symbols for architecture x86_64:
"Obstacle::run()", referenced from:
      _main in 1.o
  "Obstacle::Obstacle()", referenced from:
      _main in 1.o
  "Obstacle::~Obstacle()", referenced from:
      _main in 1.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [s] Error 1
make[1]: *** [CMakeFiles/s.dir/all] Error 2
make: *** [all] Error 2

原因

非常初级的BUG：包含着报错的类的cpp没有被编译

问题解决

project( test )
set(OpenCV_DIR "/usr/local/Cellar/opencv/4.0.1/lib/cmake/opencv4")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
find_package( OpenCV REQUIRED )
add_executable( test 1.cpp)
target_link_libraries( s ${OpenCV_LIBS} )

将add_executable后，添加了我新加入项目的cpp，问题解决

add_executable( test 1.cpp AddObstacle.cpp)