编译OpenCV——ubuntu x86_64平台

在x86_64平台上编译得到两个版本的opencv：x86_64和arm64

方式与此博客一样编译OpenCV——jetson嵌入式平台 - 夕西行 - 博客园，区别只有如下几个地方

1、编译x86_64版本时

最终放到/opt/opencv目录里

2、编译arm64版本时

最终放到/opt/opencv_aarch64目录里，以便与本地版本区分开

【测试】

用CLion创建untitled项目测试下，CMakeLists.txt

cmake_minimum_required(VERSION 3.27)
project(untitled)

set(CMAKE_CXX_STANDARD 17)

#生成的可执行程序能够被鼠标双击执行
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -no-pie")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -no-pie")

set(CROSS_COMPILE 1) #是否交叉编译，1交叉编译，0普通编译
if (CROSS_COMPILE)
    #arm编译
    set(CMAKE_C_COMPILER "/usr/bin/aarch64-linux-gnu-gcc")
    set(CMAKE_CXX_COMPILER "/usr/bin/aarch64-linux-gnu-g++")
    set(OPENCV_DIR "/opt/opencv_aarch64")#指定opencv路径else()
    #普通编译
    set(CMAKE_C_COMPILER "/usr/bin/gcc")
    set(CMAKE_CXX_COMPILER "/usr/bin/g++")
    set(OPENCV_DIR "/opt/opencv")
endif ()

include_directories(${OPENCV_DIR}/include/opencv4)

add_executable(untitled main.cpp)
target_link_libraries(untitled ${OPENCV_DIR}/lib/libopencv_world.so)

set(EXECUTABLE_OUTPUT_PATH ${CMAKE_CURRENT_LIST_DIR})

main.cpp

#include "opencv2/opencv.hpp"

int main()
{
    cv::Mat img=cv::Mat::zeros(200,600,CV_8UC3);
    cv::putText(img,"Show my text",cv::Point(100,100),cv::FONT_HERSHEY_TRIPLEX,1.5,cv::Scalar(0,0,255),2);
    cv::namedWindow("title");
    cv::imshow("title",img);
    cv::waitKey();
    return 0;
}