开发环境

编译环境：Debian 10 | Win10 1903 X64
开发工具：android-ndk-r14b-linux-x86_64 | android-ndk-r20-windows-x86_64
参考项目：官方文档 | MySQL_Driver_Qt
所需源码：libiconv | openssl | mariadb-connector-c | qtbase-everywhere-src-5.12.5

因为我Debian系统中没有安装QT，所以在Debian下交叉编译相关库后拷贝到Win系统下使用对应版本的qmake编译mysql模块
我这里编译的是Arm64架构的库，交叉编译库所使用的编译工具为android-ndk-r14b，高版本交叉编译时会出错
因为MySQL怎么编译都通不过所以选择了MariaDB，而MariaDB库依赖libiconv和openssl，所以它们也需要编译

# 设置交叉编译环境
export ANDROID_NDK_HOME="/opt/android-ndk-r14b"
BIN_PATH="$ANDROID_NDK_HOME/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin"
SR="$ANDROID_NDK_HOME/platforms/android-24/arch-arm64"
BR="$BIN_PATH/aarch64-linux-android-"
export PATH="$BIN_PATH":$PATH

编译libiconv库

wget https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.14.tar.gz
tar -xzvf libiconv-1.14.tar.gz
cd libiconv-1.14
mkdir build & cd build

STRIP="$BR"strip RANLIB="$BR"ranlib OBJDUMP="$BR"objdump AR="$BR"ar \
CC="$BR"gcc CPP="$BR"cpp CFLAGS=--sysroot=$SR CPPFLAGS=$CFLAGS \
../configure --host=arm --prefix=/home/leux/libiconv --with-sysroot=$SR --enable-static 

make & make install

编译OPENSSL库

wget https://www.openssl.org/source/openssl-1.1.1d.tar.gz
tar -xzvf openssl-1.1.1d.tar.gz
cd openssl-1.1.1d
mkdir build & cd build

../Configure android-arm64 --prefix=/home/leux/openssl no-shared \
zlib --with-zlib-lib="$SR/usr/lib/libz.a" --with-zlib-include="$SR/usr/include" 

ANDROID_DEV=$SR/usr make
make install_sw

编译MariaDB库

wget http://mirrors.nav.ro/mariadb//connector-c-2.3.7/mariadb-connector-c-2.3.7-src.tar.gz
tar -xzvf mariadb-connector-c-2.3.7-src.tar.gz
cd mariadb-connector-c-2.3.7-src
mkdir build & cd build

sed -i -e "s|ADD_SUBDIRECTORY(unittest/libmariadb)|#ADD_SUBDIRECTORY(unittest/libmariadb)|" ../CMakeLists.txt
sed -i -e "N; s|#define _global_h|#define _global_h\n\n#ifndef ushort\n#define ushort uint16\n#endif|" ../include/my_global.h
sed -i -e "N; s|SET_TARGET_PROPERTIES(libmariadb PROPERTIES VERSION.*||" ../libmariadb/CMakeLists.txt
sed -i -e "N; s|SOVERSION \${CPACK_PACKAGE_VERSION_MAJOR})||" ../libmariadb/CMakeLists.txt 
sed -i -e "N; s|\${CPACK_PACKAGE_VERSION_MAJOR}||" ../libmariadb/CMakeLists.txt

PKG_CONFIG_PATH=$SR/usr/lib/pkgconfig cmake .. \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_C_FLAGS=--sysroot="$SR" \
-DCMAKE_INSTALL_PREFIX="/home/leux/mariadb" \
-DCMAKE_C_COMPILER="$BR"gcc \
-DCMAKE_LINKER="$BR"ld \
-DCMAKE_AR="$BR"ar \
-DCMAKE_NM="$BR"nm \
-DCMAKE_OBJCOPY="$BR"objcopy \
-DCMAKE_OBJDUMP="$BR"objdump \
-DCMAKE_RANLIB="$BR"ranlib \
-DCMAKE_STRIP="$BR"strip \
-DWITH_OPENSSL=ON -DOPENSSL_ROOT_DIR="/home/leux/openssl" \
-DOPENSSL_CRYPTO_LIBRARY="/home/leux/openssl/lib/libcrypto.a" \
-DOPENSSL_SSL_LIBRARY="/home/leux/openssl/lib/libssl.a" \
-DICONV_INCLUDE_DIR="/home/leux/libiconv/include" \
-DICONV_LIBRARIES="/home/leux/libiconv/lib/libiconv.a" \
-DWITH_EXTERNAL_ZLIB=ON \
-DZLIB_INCLUDE_DIR="$SR/usr/include" \
-DZLIB_LIBRARY="$SR/usr/lib/libz.a"

sed -i -e "N; s|#define HAVE_UCONTEXT_H 1|/* #undef HAVE_UCONTEXT_H */|" include/my_config.h
sed -i -e "N; s|#define HAVE_GETPWNAM 1|/* #undef HAVE_GETPWNAM */|" include/my_config.h
sed -i -e "N; s|#define HAVE_STPCPY 1|/* #undef HAVE_STPCPY */|" include/my_config.h

make & make install

Linux下编译QT模块

# 除了设置NDK环境外，还应指定qmake
export ANDROID_NDK_ROOT="$ANDROID_NDK_HOME"
qmake="/opt/Qt/Qt5.12.5/5.12.5/android_arm64_v8a/bin/qmake"

cd /opt/Qt/qtbase-everywhere-src-5.12.5/src/plugins/sqldrivers/mysql/

$qmake -o Makefile mysql.pro "INCLUDEPATH+=$Install_Dir/mariadb/include/mariadb" \
"LIBS+=-L$Install_Dir/libiconv/lib -L$Install_Dir/openssl/lib -L$Install_Dir/mariadb/lib/mariadb -liconv -lssl -lcrypto -lmariadbclient" 

make & make install

Win32下编译QT模块

# 设置NDK编译环境，交叉编译生成的库拷贝到D:\Qt\Arm64下
set ANDROID_NDK_ROOT=D:\Qt\Android-SDK\android-ndk-r20
set PATH=D:\Qt\Qt5.12.5\5.12.5\android_arm64_v8a\bin;D:\Qt\Android-SDK\android-ndk-r20\prebuilt\windows-x86_64\bin;%PATH% 

cd D:\Qt\qtbase-everywhere-src-5.12.5\src\plugins\sqldrivers\mysql\

qmake "INCLUDEPATH+=-ID:\Qt\Arm64\mariadb\include\mariadb" "LIBS+=-LD:\Qt\Arm64\libiconv\lib -LD:\Qt\Arm64\openssl\lib -LD:\Qt\Arm64\mariadb\lib\mariadb -lmariadbclient -liconv -lssl -lcrypto" -o Makefile mysql.pro 

make & make install

问题解决

如果qmake报错找不到：qtsqldrivers-config.pri，则新建它，内容如下两行：

# 文件位置：qtbase-everywhere-src-5.12.5/src/plugins/sqldrivers/qtsqldrivers-config.pri
# 注意将路径更改为你的mariadb所在位置
QMAKE_LIBS_MYSQL = D:\Qt\Arm64\mariadb\lib\mariadb\libmariadbclient.a
QMAKE_INCDIR_MYSQL = D:\Qt\Arm64\mariadb\include\mariadb

安装完成后会在下面路径看到多了两个文件

1 2	D:\Qt\Qt5.12.5\5.12.5\android_arm64_v8a\plugins\sqldrivers\libqsqlmysql.so D:\Qt\Qt5.12.5\5.12.5\android_arm64_v8a\lib\cmake\Qt5Sql\Qt5Sql_QMYSQLDriverPlugin.cmake