1.将3568sdk里面的交叉编译工具链拷贝到 opt 下
sudo cp gcc-buildroot-9.3.0-2020.03-x86_64_aarch64-rockchip-linux-gnu /opt
2.sudo vim etc/profile 添加环境变量：
export PATH=”/opt/gcc-buildroot-9.3.0-2020.03-x86_64_aarch64-rockchip-linux-gnu/bin/:$PATH”
然后执:source profile
3.下载qt-everywhere-src-5.14.2.tar.gz
4.解压 tar -zxvf qt-everywhere-src-5.14.2.tar.gz
5.cd qt-everywhere-src-5.14.2/qtbase/mkspecs/
6.cp linux-aarch64-gnu-g++ linux-rockchip-aarrch64-g++ -rf
7.修改linux-rockchip-aarrch64-g++文件夹内的qmake.conf文件内容为所需的交叉编译环境
#

qmake configuration for building with arm-linux-g++

#
MAKEFILE_GENERATOR = UNIX
CONFIG += incremental
QMAKE_INCREMENTAL_STYLE = sublib

QT_QPA_DEFAULT_PLATFORM = linuxfb
QMAKE_CFLAGS_RELEASE += -O2 -march=armv8-a -lts
QMAKE_CXXFLAGS_RELEASE += -O2 -march=armv8-a -lts

include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)

modifications to g++.conf

QMAKE_CC = aarch64-rockchip-linux-gnu-gcc
QMAKE_CXX = aarch64-rockchip-linux-gnu-g++
QMAKE_LINK = aarch64-rockchip-linux-gnu-g++
QMAKE_LINK_SHLIB = aarch64-rockchip-linux-gnu-g++

modifications to linux.conf

QMAKE_AR = aarch64-rockchip-linux-gnu-ar cqs
QMAKE_OBJCOPY = aarch64-rockchip-linux-gnu-objcopy
QMAKE_NM = aarch64-rockchip-linux-gnu-nm -P
QMAKE_STRIP = aarch64-rockchip-linux-gnu-strip
load(qt_config)
8.回到根目录qt-everywhere-src-5.14.2$/执行
./configure -release -opensource -confirm-license -make libs -xplatform linux-rockchip-arrch64-g++ -prefix $PWD/qt5.14.2 -no-opengl -no-ico -strip -shared -nomake examples -no-sse2 -nomake tests -nomake tools -no-iconv
9.make -j4
10.make install 安装qt5.14.2

这个报错可以忽略
11.看是否安装成功

cd qt-everywhere-src-5.14.2/qt5.14.2/bin
cp qmake qmake3568
14.建立软连接
sudo ln -s /xxx/xxx/qt-everywhere-src-5.14.2/qt5.14.2/bin/qmake /usr/bin/qmake-3568
15.在qt 软件中Projects -> Manage Kits->QT Versions 添加qt版本路径， /打开qmake
apply 启动应用

16.在Kits页面添加需要的交叉编译器

name：自己随便设置
Sysroot：软件会自动识别拷贝到opt目录下的3568的交叉编译工具链
qt version：换成添加的qt版本
在交叉编译器bin目录下，ls -l可以查看该交叉编译器软连接到何处。
17.更改pro文件，将生成可执行文件目录更改为/home/xxx/xxx/
DESTDIR =/home/xxx/xxx