CMake error: 'target is not built by this project'

Question

我的 CMakeLists.txt 文件是：

cmake_minimum_required(VERSION 3.7)
project(OpenCV_Basics)

set(CMAKE_CXX_STANDARD 11)

set(SOURCE_FILES main.cpp)

find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_LIBS})
target_link_libraries(OpenCV_Basics )

add_executable(OpenCV_Basics ${SOURCE_FILES})

当我尝试编译 main.cpp 时，我卡住了。

CMake Error at CMakeLists.txt:10 (target_link_libraries):
  Cannot specify link libraries for target "OpenCV_Basics" which is not 
built
  by this project.

怎么了？

我 Mac 在 Clion 工作。

Answer 1

当任何 CMake 命令接受 target 参数时，它期望给定目标 已经创建。

正确用法：

# Create target 'OpenCV_Basics' 
add_executable(OpenCV_Basics ${SOURCE_FILES})
# Pass the target to other commands
target_link_libraries(OpenCV_Basics ${OpenCV_LIBRARIES})

Answer 2

add_executable 定义了一个目标，但是在您的代码上您定义了一个目标在尝试编译它之后。

只需更改这两行的位置：

先定义目标
link图书馆。

像这样

add_executable(OpenCV_Basics ${SOURCE_FILES})
target_link_libraries(OpenCV_Basics )

CMake error: 'target is not built by this project'

CMake error: 'target is not built by this project'

c++

opencv

cmake

clion