CMakeLists使用：使用cmake构建工程并链接OpenCV

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上一篇博文中介绍了使用cmake构建工程的详细过程，然而实际中我们的工程往往会依赖一些外部的第三方库比如OpenCV,以及需要开启一些加速选项比如SSE加速，OpenMP并行处理等等。对于这种稍微有点复杂的工程的CMakeList.txt怎么写，通过实例来讲会更容易理解。下面是我写的一个关于adas项目的CMakeList.txt，项目中有使用到OpenCV。下面详细讲解一下我写的这个CMakeList.txt文件。

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cmake_minimum_required(VERSION 2.8.7) #设置cmake的版本

SET(PROJECT_NAME adas)                #设置项目名称为adas
project(${PROJECT_NAME})
option(USE_OPENMP      "Set to ON to build use openmp"  ON) #打开OpenMP并行处理开关
option(USE_SSE         "Set to ON to build use SSE"  ON)    #打开SSE加速开关

# Use C++11
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")    #使用c++11
message(STATUS "C++11 support has been enabled by default.") #打印信息
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")    #release 模式编译

# Use OpenMP                                                 #使用OpenMP
if (USE_OPENMP)
    find_package(OpenMP QUIET)   
    if (OPENMP_FOUND)
        message(STATUS "Use OpenMP")
        add_definitions(-DUSE_OPENMP)
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
    endif()
endif()
# Use SSE                                                  #使用SSE
if (USE_SSE)
    add_definitions(-DUSE_SSE)
    message(STATUS "Use SSE")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.1")
endif()

#Use OpenCV
find_package(OpenCV REQUIRED)

# If the package has been found, several variables will  be set, you can find the full list with descriptions
# Print some message showing some of them
message(STATUS "OpenCV library status:")
message(STATUS "    version: ${OpenCV_VERSION}")
message(STATUS "    libraries: ${OpenCV_LIBS}")
message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")

# Add OpenCV headers location to your include paths
include_directories(${OpenCV_INCLUDE_DIRS})       #将openCV头文件包含进工程

FILE(GLOB SOURCE_0 "${CMAKE_SOURCE_DIR}/main/main.cpp")
FILE(GLOB SOURCE_1 "${CMAKE_SOURCE_DIR}/src/*.cpp")
FILE(GLOB SOURCE_2 "${CMAKE_SOURCE_DIR}/src/*.c")


# Build shared library
set(BUILD_SHARED_LIBS ON)
INCLUDE_DIRECTORIES("${CMAKE_SOURCE_DIR}/include/") 

add_library(libadas ${SOURCE_1} ${SOURCE_2}) #生成动态链接库
link_libraries(libadas)

ADD_EXECUTABLE(${PROJECT_NAME} ${SOURCE_0})  
# Link your application with OpenCV libraries
target_link_libraries(${PROJECT_NAME} ${OpenCV_LIBS} ${libadas}) #将OpenCV链接到adas工程中去

上面有的我没有写注释，像message，find_package等，使用cmake构建工程并链接OpenCV库的整个过程就是这样，挺简单的，不是很复杂，而且容易理解。