How to Build, Install and Setting Qt Application

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1 Qt Versions

Qt has various versions for various platforms. Each Qt version has its own features and here a list of versions:

CPU	Qt Version	Display Driver	OpenGL	QtWebEngine	Capacitive Touch	ARM Board
S5P4418	Qt 5.9.1	EGLFS	Yes	Yes	Multiple-point touch	NanoPi S2/NanoPi M2A/NanoPi Fire2/NanoPC T2/Smart4418
S5P6818	Qt 5.9.1	EGLFS	Yes	Yes	Multiple-point touch	NanoPi M3/NanoPi Fire3/NanoPC T3
Allwinner H3	Qt 4.8.6	LinuxFB	No	No	Single-point touch	NanoPi-Duo/NanoPi-M1-Plus/NanoPi-M1/NanoPi-NEO-Air/NanoPi-NEO-Core/NanoPi-NEO
Allwinner H5	Qt 4.8.6	LinuxFB	No	No	Single-point touch	NanoPi-M1-Plus2/NanoPi-NEO-Core2/NanoPi-NEO-Plus2/NanoPi-NEO2
Amlogic S905	Qt 5.9.1	LinuxFB	No	No	Single-point touch	NanoPi-K2

2 Install Cross Compiler for Qt

(Note: we suggest users use a host PC running a 64-bit Ubuntu 16.04)
Here is a list of cross compilers for various CPUs and ARM boards:

CPU	Qt Version	Compiler & QtSDK
S5P4418	Qt 5.9.1	download link
S5P6818	Qt 5.9.1	download link
Allwinner H3	Qt 4.8.6	download link
Allwinner H5	Qt 4.8.6	download link
Amlogic S905	Qt 5.9.1	download link

Install a cross compiler by running the following commands:

chmod 755 ./install.sh
sudo ./install.sh

3 Cross Compile Qt Program

下面以下载并编译一个 QtE-Demo 为例，分别说明在各个平台编译一个 Qt应用程序的步骤：

3.1 S5P4418平台的编译

git clone https://github.com/friendlyarm/QtE-Demo
mkdir build && cd build
/usr/local/Trolltech/Qt-5.9.1-nexell32/bin/qmake ../QtE-Demo/QtE-Demo.pro
make

3.2 S5P6818平台的编译

git clone https://github.com/friendlyarm/QtE-Demo
mkdir build && cd build
/usr/local/Trolltech/Qt-5.9.1-nexell64/bin/qmake ../QtE-Demo/QtE-Demo.pro
make

3.3 Allwinner H3平台的编译

export PATH=/opt/FriendlyARM/toolschain/4.9.3/bin/:$PATH
git clone https://github.com/friendlyarm/QtE-Demo
mkdir build && cd build
/usr/local/Trolltech/QtEmbedded-4.8.6-arm/bin/qmake ../QtE-Demo/QtE-Demo-Qt4.pro
make

3.4 Allwinner H5平台的编译

export PATH=/opt/FriendlyARM/toolschain/a64-32bit-tootchain/bin/:$PATH
git clone https://github.com/friendlyarm/QtE-Demo
mkdir build && cd build
/usr/local/Trolltech/QtEmbedded-4.8.6-arm-a64/bin/qmake ../QtE-Demo/QtE-Demo-Qt4.pro
make

3.5 Amlogic S905平台的编译

export PATH=/opt/FriendlyARM/toolschain/a64-32bit-tootchain/bin/:$PATH
git clone https://github.com/friendlyarm/QtE-Demo
mkdir build && cd build
/usr/local/Trolltech/QtEmbedded-5.9.1-arch64/bin/qmake ../QtE-Demo/QtE-Demo.pro
make

4 在开发板上运行Qt程序

运行Qt程序之前，需要先设置环境变量，在开发板上执行以下命令即可：

Qt5，使用 setqt5env:

. /usr/bin/setqt5env

Qt4，使用 setqt4env:

. /usr/bin/setqt4env

例如运行上一章节编译的QtE-Demo:

./QtE-Demo -qws

5 开机自动运行Qt程序

以运行上一章节中的 QtE-Demo 程序为例，假设它放在 /root 目录，则你可以编辑 /etc/rc.local 文件，确否有以下内容：

. /usr/bin/setqt5env
/root/QtE-Demo -qws&

如果是 Qt4，请将setqt5env改为setqt4env。

6 屏幕旋转

根据你所用开发板的CPU型号，点击下表中的链接，下载链接内的所有文件到本地:

CPU名称	Qt版本	屏幕旋转方法
S5P4418	Qt 5.9.1	export ROTATION=-90 . setqt5env ./YourApp 可设置角度值为: 0, 90, 180, -90
S5P6818	Qt 5.9.1	export ROTATION=-90 . setqt5env ./YourApp 可设置角度值为: 0, 90, 180, -90
Allwinner H3	Qt 4.8.6	. setqt4env export QWS_DISPLAY='Transformed:Rot90' ./YourApp 可设置角度值为: 0, 90, 180, 270
Allwinner H5	Qt 4.8.6	. setqt4env export QWS_DISPLAY='Transformed:Rot90' ./YourApp 可设置角度值为: 0, 90, 180, 270
Amlogic S905	Qt 5.9.1	. setqt5env export QT_QPA_PLATFORM=linuxfb:fb=/dev/fb0:rotation=90 ./YourApp 可设置角度值为: 0, 90, 180, 270