踩坑，RK3588编译运行rknn的c++例程

官网：

https://github.com/airockchip/rknn-toolkit2
下载rknn-toolkit2-master.zip
解压缩后
cd进入rknn-toolkit2-master/rknpu2/examples/rknn_yolov5_demo

将脚本设置可执行
chmod 777 build-linux.sh
按照README_CN.md里的说明运行
./build-linux.sh -t rk3588 -a aarch64 -b Release

结果build-linux.sh里GCC_COMPILER首先作妖。

./build-linux.sh -t rk3588 -a aarch64 -b Release
Please set GCC_COMPILER for rk3588
such as export GCC_COMPILER=~/opt/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu

那就删掉为空，直接gcc或g++即可。

#!/bin/bash

set -e

echo "$0 $@"
while getopts ":t:a:b" opt; do
  case $opt in
    t)
      TARGET_SOC=$OPTARG
      ;;
    a)
      TARGET_ARCH=$OPTARG
      ;;
    b)
      BUILD_TYPE=$OPTARG
      ;;
    :)
      echo "Option -$OPTARG requires an argument." 
      exit 1
      ;;
    ?)
      echo "Invalid option: -$OPTARG index:$OPTIND"
      ;;
  esac
done

if [ -z ${TARGET_SOC} ];then
  echo "$0 -t <target> -a <arch> [-b <build_type>]"
  echo ""
  echo "    -t : target (rk3566/rk3568/rk3562/rk3576/rk3588)"
  echo "    -a : arch (aarch64/armhf)"
  echo "    -b : build_type(Debug/Release)"
  echo "such as: $0 -t rk3588 -a aarch64 -b Release"
  echo ""
  exit -1
fi

echo "$GCC_COMPILER"
export CC=gcc
export CXX=g++

if command -v ${CC} >/dev/null 2>&1; then
    :
else
    echo "${CC} is not available"
    echo "Please set GCC_COMPILER for $TARGET_SOC"
    echo "such as export GCC_COMPILER=~/opt/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu"
    exit
fi

# Debug / Release
if [[ -z ${BUILD_TYPE} ]];then
    BUILD_T