交叉编译aarch64的Qt5.12.2，附带Mysql插件编译

一、配置交叉编译工具链

1、交叉编译工具链目录

/opt/zlg/m3568-sdk-v1.0.0-ga/gcc-buildroot-9.3.0-2020.03-x86_64_aarch64-rockchip-linux-gnu/bin/aarch64-rockchip-linux-gnu-g++
/opt/zlg/m3568-sdk-v1.0.0-ga/gcc-buildroot-9.3.0-2020.03-x86_64_aarch64-rockchip-linux-gnu/bin/aarch64-rockchip-linux-gnu-gcc

2、编辑bashrc

vi ~/.bashrc，在末尾添加

export PATH=/opt/zlg/m3568-sdk-v1.0.0-ga/gcc-buildroot-9.3.0-2020.03-x86_64_aarch64-rockchip-linux-gnu/bin:$PATH
export CROSS_COMPILE=aarch64-rockchip-linux-gnu-

使用source ~/.bashrc来使得修改生效。

二、配置mkspecs

进入目录

/home/zfadmin/Qt5.12.2_src_arm/qt-everywhere-src-5.12.2/qtbase/mkspecs

复制一份使用rockchip的平台

cp -r linux-aarch64-gnu-g++ linux-aarch64-rockchip-gnu

其中linux-aarch64-rockchip-gnu/qmake.conf的内容如下

#
# qmake configuration for building with aarch64-rockchip-linux-gnu-g++
#MAKEFILE_GENERATOR      = UNIX
CONFIG                 += incremental
QMAKE_INCREMENTAL_STYLE = sublibinclude(../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)

三、编译Qt

稍后再单独编译mysql插件

进入主目录，执行如下：

./configure -opensource -confirm-license -nomake tests -nomake examples -release -no-opengl \
-platform linux-g++ -xplatform linux-aarch64-rockchip-gnu \
-prefix /home/zfadmin/armqt-5.12.2_2

make -j8

make install

在armqt-5.12.2_2生成了Qt可执行文件和相关库文件

四、编译Qt的Mysql插件

1、修改mysql.pro

进入目录/home/zfadmin/Qt5.12.2_src_arm/qt-everywhere-src-5.12.2/qtbase/src/plugins/sqldrivers/mysql

编辑mysql.pro文件，其中openssl是在编译Mysql库的时候使用的：

TARGET = qsqlmysql
SOURCES += $$PWD/qsql_mysql.cpp
HEADERS += $$PWD/qsql_mysql_p.h# 包含路径和库路径
INCLUDEPATH += /home/zfadmin/mySQLArmv8Install/include /home/zfadmin/openssl1.0.0_install/include
LIBS += -L/home/zfadmin/mySQLArmv8Install/lib -lmysqlclient
LIBS += -L/home/zfadmin/openssl1.0.0_install/lib -lssl -lcrypto# 线程和其他系统库
LIBS += -lpthread -lm -lrt -ldl# 插件特定配置
QT += sql
CONFIG += plugin
PLUGIN_CLASS_NAME = QMYSQLDriverPlugin# qsqldriverbase.pri 是Qt内部使用的，用于设置基本的SQL驱动配置
include(../qsqldriverbase.pri)

2、qmake

使用刚编译出来的qmake

/home/zfadmin/armqt-5.12.2_2/bin/qmake

3、make及make install

make -j4

make install 

可在/home/zfadmin/armqt-5.12.2_2/plugins/sqldrivers 中看到libqsqlmysql.so