find_package

检查需要的包的包名

╰─ dpkg -L libopencv-dev | grep 'cmake'                
/usr/lib/x86_64-linux-gnu/cmake
/usr/lib/x86_64-linux-gnu/cmake/opencv4
/usr/lib/x86_64-linux-gnu/cmake/opencv4/OpenCVConfig-version.cmake
/usr/lib/x86_64-linux-gnu/cmake/opencv4/OpenCVConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/opencv4/OpenCVModules-release.cmake
/usr/lib/x86_64-linux-gnu/cmake/opencv4/OpenCVModules.cmake

从上面的可以看到这个库的cmake文件是OpenCVConfig.cmake，所以它的库名字是OpenCV, 所以CMakeLists.txt可以这么写：

1
2
3

find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS}) # Not needed for CMake >= 2.8.11
target_link_libraries(MY_TARGET_NAME ${OpenCV_LIBS})

find_package 会对应设置以下几类变量：

[PackageName]_FOUND: 如果找到了包，则会设置为TRUE，否则为FALSE。
[PackageName]_INCLUDE_DIRS 或 [PackageName]_INCLUDES: 包含目录列表，你可以用这个变量来将包含目录添加到你的项目中。
[PackageName]_LIBRARIES 或 [PackageName]_LIBS: 库文件列表，用来链接你的项目和依赖库。
[PackageName]_DEFINITIONS: 编译器定义列表，需要添加到你的编译器命令行中去，以便使用库。

Pkg-config

pkgconfig需求的是一个pc文件，我们可以查找库的pc文件，同上面的方法

1 2	╰─ dpkg -L libopencv-dev \| grep 'pc' /usr/lib/x86_64-linux-gnu/pkgconfig/opencv4.pc

这里找打了opencv4这个名字，需要写到pkg_check_modules的第三个参数

下面是一个CMakeLists.txt例子

# CMakeLists.txt
# A sample CMake project that uses pkg-config to find a library (let's say, 'libexample')

cmake_minimum_required(VERSION 3.0)
project(ExampleProject)

# It's a good practice to set the minimum required version of pkg-config
find_package(PkgConfig REQUIRED)

# Use pkg-config to check if 'libexample' is installed on the system
pkg_check_modules(LIBEXAMPLE REQUIRED libexample)

# Include directories for 'libexample'
include_directories(${LIBEXAMPLE_INCLUDE_DIRS})

# Link directories for 'libexample'
link_directories(${LIBEXAMPLE_LIBRARY_DIRS})

# Add executable target with source files
add_executable(example_executable main.cpp)

# Link the executable to the required library
target_link_libraries(example_executable ${LIBEXAMPLE_LIBRARIES})

# Add any compiler definitions or compile options if necessary
add_definitions(${LIBEXAMPLE_CFLAGS_OTHER})