build_embed_linux_system

支持QT的Linux文件系统构建

对于Qt环境的支持，理论上并不属于直接构建文件系统，而是文件系统中关于QT执行环境的的编译和移植。不过Qt因为编译调试复杂，因此将Qt编译也作为单独的系统构建部分说明。对于Qt环境的支持，包含如下所示。

• tslib触摸屏库和应用的编译安装
• Qt库和应用的编译安装
• Qt应用界面支持
• 编译支持QT的应用
• 下一章节

tslib_cross_compiler

# 下载tslib地址
wget https://github.com/libts/tslib/releases/download/1.23/tslib-1.23.tar.bz2

tar -xvf tslib-1.23.tar.bz2
cd tslib-1.23/

./configure --host=arm-none-linux-gnueabihf ac_cv_func_malloc_0_nonnull=yes -prefix="${SUPPORT_ENV_INSTALL}"

make && make install

qt_cross_compiler

# 下载qt-opensource代码
wget https://mirrors.tuna.tsinghua.edu.cn/qt/archive/qt/5.15/5.15.13/single/qt-everywhere-opensource-src-5.15.13.tar.xz

tar -xvf qt-everywhere-opensource-src-5.15.13.tar.xz
cd  qt-everywhere-src-5.15.13/qtbase/

# 修改编译工具和flags
vim mkspecs/linux-arm-gnueabi-g++/qmake.conf

#####################################################################
#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

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

QT_QPA_DEFAULT_PLATFORM = linuxfb
QMAKE_CFLAGS += -O2 -march=armv7-a -mtune=cortex-a7 -mfpu=neon -mfloat-abi=hard
QMAKE_CXXFLAGS += -O2 -march=armv7-a -mtune=cortex-a7 -mfpu=neon -mfloat-abi=hard

# modifications to g++.conf
QMAKE_CC                = arm-none-linux-gnueabihf-gcc
QMAKE_CXX               = arm-none-linux-gnueabihf-g++
QMAKE_LINK              = arm-none-linux-gnueabihf-g++
QMAKE_LINK_SHLIB        = arm-none-linux-gnueabihf-g++

# modifications to linux.conf
QMAKE_AR                = arm-none-linux-gnueabihf-ar cqs
QMAKE_OBJCOPY           = arm-none-linux-gnueabihf-objcopy
QMAKE_NM                = arm-none-linux-gnueabihf-nm -P
QMAKE_STRIP             = arm-none-linux-gnueabihf-strip
load(qt_config)
#########################################################################

# 添加编译脚本
cd  ../
vim autogen.sh

#####################################################################
#autogen.sh
#
# 自动编译脚本
#
./configure -prefix ${SUPPORT_ENV_INSTALL} \
-opensource \
-confirm-license \
-release \
-strip \
-shared \
-xplatform linux-arm-gnueabi-g++ \
-optimized-qmake \
-c++std c++14 \
--rpath=no \
-pch \
-skip qt3d \
-skip qtactiveqt \
-skip qtandroidextras \
-skip qtcanvas3d \
-skip qtconnectivity \
-skip qtdatavis3d \
-skip qtdoc \
-skip qtgamepad \
-skip qtlocation \
-skip qtmacextras \
-skip qtnetworkauth \
-skip qtpurchasing \
-skip qtremoteobjects \
-skip qtscript \
-skip qtscxml \
-skip qtsensors \
-skip qtspeech \
-skip qtsvg \
-skip qttools \
-skip qttranslations \
-skip qtwayland \
-skip qtwebengine \
-skip qtwebview \
-skip qtwinextras \
-skip qtx11extras \
-skip qtxmlpatterns \
-make libs \
-make examples \
-nomake tools -nomake tests \
-gui \
-widgets \
-dbus-runtime \
--glib=no \
--iconv=no \
--pcre=qt \
--zlib=qt \
-no-openssl \
--freetype=qt \
--harfbuzz=qt \
-no-opengl \
-linuxfb \
--xcb=no \
-tslib \
--libpng=qt \
--libjpeg=qt \
--sqlite=qt \
-plugin-sql-sqlite \
-I"${SUPPORT_ENV_INSTALL}"/include \
-L"${SUPPORT_ENV_INSTALL}"/lib \
-recheck-all

# start build
gmake -j3

# start install
gmake install
##############################################################

# 执行编译脚本
chmod 777 autogen.sh && ./autogen.sh

qt_support_path

在系统环境中支持QT应用需要添加以下环境变量，一般添加到/etc/profile中来保证启动时执行。

export TSLIB_ROOT=""
export TSLIB_CONSOLEDEVICE=none
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_TSDEVICE=/dev/input/event1
export TSLIB_CONFFILE=$TSLIB_ROOT/etc/ts.conf
export TSLIB_PLUGINDIR=$TSLIB_ROOT/lib/ts
export TSLIB_CALIBFILE=/etc/pointercal
export LD_PRELOAD=$TSLIB_ROOT/lib/libts.so

export QT_ROOT=""
export QT_QPA_GENERIC_PLUGINS=tslib:/dev/input/event1
export QT_QPA_FONTDIR=/usr/share/fonts
export QT_QPA_PLATFORM_PLUGIN_PATH=$QT_ROOT/plugins
export QT_QPA_PLATFORM=linuxfb:tty=/dev/fb0
export QT_PLUGIN_PATH=$QT_ROOT/plugins
export LD_LIBRARY_PATH=$QT_ROOT/lib:$QT_ROOT/plugins/platforms
export QML2_IMPORT_PATH=$QT_ROOT/qml
export QT_QPA_FB_TSLIB=1

export XDG_RUNTIME_DIR="/tmp/runtime-root"

qt_app_build

编译Qt应用的方法步骤如下所示。

# 通过qmake生成QT系统信息
${SUPPORT_ENV_INSTALL}/bin/qmake

# 执行make命令编译工程
make

详细代码如下所示：编译QT例程目录

next_chapter

返回目录

直接开始下一章节说明: 基于OpenWRT构建系统平台

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