安装环境：
Ubuntu18.04
GCC：gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
CROOSS-tools：gcc version 8.3.0 (crosstool-NG 1.24.0)
下载5.12安装包，解压后修改qmake.conf配置参数，将编译工具修改为交叉编译器
/qt-everywhere-src-5.12.12$ vi qtbase/mkspecs/linux-arm-gnueabi-g++/qmake.conf
#
# qmake configuration for building with arm-linux-gnueabi-g++
#
MAKEFILE_GENERATOR = UNIX
CONFIG += incremental
QMAKE_INCREMENTAL_STYLE = sublib
QT_QPA_DEFAULT_PLATFORM = linuxfb #eglfs
QMAKE_CFLAGS_RELEASE += -O2 -march=armv7-a
QMAKE_CXXFLAGS_RELEASE += -O2 -march=armv7-a
include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)
# modifications to g++.conf
QMAKE_CC = /home/luckfox/workspace/luckfox-pico/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-gcc
QMAKE_CXX = /home/luckfox/workspace/luckfox-pico/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-g++
QMAKE_LINK = /home/luckfox/workspace/luckfox-pico/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-g++
QMAKE_LINK_SHLIB = /home/luckfox/workspace/luckfox-pico/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-g++
# modifications to linux.conf
QMAKE_AR = /home/luckfox/workspace/luckfox-pico/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-ar cqs
QMAKE_OBJCOPY = /home/luckfox/workspace/luckfox-pico/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-objcopy
QMAKE_NM = /home/luckfox/workspace/luckfox-pico/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-nm -P
QMAKE_STRIP = /home/luckfox/workspace/luckfox-pico/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-strip
load(qt_config)