背景

最近的一个工作任务是将之前在联咏平台上做的一个人脸识别的项目移植过去。之前这个项目主要是做的，移植的事情自然落到我身上了。组里也没人搞过瑞芯微的，开始踩坑淌水。

交叉编译工具

问了公司一圈人也没一个文档告诉我瑞芯微交叉编译的环境在哪儿，只有自己搭建一个了。

交叉编译工具链下载地址:

https://developer.arm.com/-/media/Files/downloads/gnu-a/8.3-2019.03/binrel/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf.tar.xz?revision=e09a1c45-0ed3-4a8e-b06b-db3978fd8d56&hash=E8254BD866E33EF3F2C650C535EE37C2318EF5D0https://developer.arm.com/-/media/Files/downloads/gnu-a/8.3-2019.03/binrel/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf.tar.xz?revision=e09a1c45-0ed3-4a8e-b06b-db3978fd8d56&hash=E8254BD866E33EF3F2C650C535EE37C2318EF5D0

配置 cmake toolchain，命名为toolchain_RK.cmake

# cmake_minimum_required (VERSION 3.12)

# PLATEFORM_COMPILER_TOOL配置成自己交叉编译工具的目录
set(PLATEFORM_COMPILER_TOOL "/opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-")

# this one is important
SET(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)
#this one not so much
SET(CMAKE_SYSTEM_VERSION 1)

# where is the target environment
SET(CMAKE_FIND_ROOT_PATH /opt/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/)

# specify the cross compiler
set(CMAKE_C_COMPILER "${PLATEFORM_COMPILER_TOOL}gcc")
set(CMAKE_CXX_COMPILER "${PLATEFORM_COMPILER_TOOL}g++")


# # search for programs in the build host directories
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# # for libraries and headers in the target directories
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

编译opencv

从opencv 官网上下载opencv的源码进行编译。编译很简单

mkdir build_rk1109
cd build_rk1109
cmake .. -DCMAKE_TOOLCHAIN_FILE=../toolchain_RK.cmake

然后愉快得等待build完成，编译完成之后兴高采烈地开始进行测试。熟练地写上测试代码demo.cpp

#include <iostream>
#include <opencv2/core.hpp>
#include <opencv2/highgui/highgui.hpp>
int main()
{
    cv::Mat img;
    img = cv::imread("./1.jpg");
    std::cout << img << std::endl;
}

然后写成CMakeList.txt

cmake_minimum_required(VERSION 3.1)
project(demo)

set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_STANDARD 11)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

set(OPENCV_INCLUDE_DIRS /home/lc/Desktop/yutao/opencv/include)
set(OPENCV_LINK_LIBS /home/lc/Desktop/yutao/opencv/lib)


link_directories(${OPENCV_LINK_LIBS})
include_directories(${OPENCV_INCLUDE_DIRS})
add_executable(demo demo.cpp)
target_link_libraries(demo 
                    opencv_core
                    opencv_highgui
                    opencv_imgproc
                    opencv_highgui
                    )

然后就报错了。