编译主机: Ubuntu20.04
Qt源码版本: qt-everywhere-opensource-src-5.15.2.tar.gz
交叉编译工具: arm-linux-gnueabihf-gcc

1、下载解压，然后cd到文件夹下

tar -vzxf qt-everywhere-opensource-src-5.15.2.tar.gz
cd qt-everywhere-opensource-src-5.15.2

2.修改交叉编译架构用到的信息

(1).cd到如下目录,ls可以看到qt支持的交叉编译器列表

cd qt-everywhere-opensource-src-5.15.2/qtbase/mkspecs/
ls

(2).一定要找到自己实际使用的编译器,这里是arm-linux-gnueabihf-gcc,发现没有这个目录,没关系,我们创建一个

mkdir arm-linux-gnueabihf-gcc

(3).然后复制其他平级文件夹中的两个文件qmake.conf和qplatformdefs.h到这个目录下

(4).打开qmake.conf,修改一下你的交叉编译器的绝对路径,和需要预编译的模块路径,如tslibTF显示屏模块和sqlite数据库模块,这里单独去编译,不在此赘述

#
# qmake configuration for building with arm-linux-gnueabihf-g++
#
 
MAKEFILE_GENERATOR      = UNIX
CONFIG                 += incremental
QMAKE_INCREMENTAL_STYLE = sublib
 
QT_QPA_DEFAULT_PLATFORM = linux #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)
 
QMAKE_INCDIR += /opt/tslib/include /opt/sqlite3/include   #指定头文件，需预编译
QMAKE_LIBDIR += /opt/tslib/lib /opt/sqlite3/lib           #指定库文件，需预编译

# modifications to g++.conf
QMAKE_CC                = /usr/local/arm/arm-gcc/bin/arm-linux-gnueabihf-gcc -lts
QMAKE_CXX               = /usr/local/arm/arm-gcc/bin/arm-linux-gnueabihf-g++ -lts
QMAKE_LINK              = /usr/local/arm/arm-gcc/bin/arm-linux-gnueabihf-g++ -lts
QMAKE_LINK_SHLIB        = /usr/local/arm/arm-gcc/bin/arm-linux-gnueabihf-g++ -lts
 
# modifications to linux.conf
QMAKE_AR                = /usr/local/arm/arm-gcc/bin/arm-linux-gnueabihf-ar cqs
QMAKE_OBJCOPY           = /usr/local/arm/arm-gcc/bin/arm-linux-gnueabihf-objcopy
QMAKE_NM                = /usr/local/arm/arm-gcc/bin/arm-linux-gnueabihf-nm -P
QMAKE_STRIP             = /usr/local/arm/arm-gcc/bin/arm-linux-gnueabihf-strip
load(qt_config)

3.编写生成Makefile的脚本
(1).cd到qt源码根目录
(2).新建一个autoConfigure.sh脚本

#!/bin/sh
./configure \
-v \
-prefix /opt/qt-5.15.2 \
-release \
-opensource \
-no-accessibility \
-make libs \
-xplatform arm-linux-gnueabihf-g++ \ 
-optimized-qmake \
-pch \
-qt-sql-sqlite \    
-qt-zlib \
-skip qtdeclarative \
-no-opengl \
-no-sse2 \
-no-openssl \
-no-cups \
-no-glib \
-no-pkg-config \
-no-separate-debug-info  \
-tslib \
-I/opt/tslib/include \
-L/opt/tslib/lib                      

-xplatform arm-linux-gnueabihf-g++ \ #这个名字要与2.(2)中创建的目录名字一致,否则检索不到,一般与编译器同名,但未必,需注意

c-qt-sql-sqlite \需预编译,如果没有提前编译,执行脚本会报如下错误,下面的-tslib \同理

ERROR: Invalid value given for boolean command line option 'sql-sqlite'.

(3).运行脚本

 ./autoConfigure.h

完成,qt源码根目录已生成Makefile

3.编译
(1).在源码根目录make

make

(2).生成可移植的库到/opt/qt.5.15.2

make install

在/opt/qt-5.15.2下可看到如下文件夹,说明编译成功