Qt5.9.4+OpenGL调试笔记：QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'

最近项目开发需要用到qml，因为qml需要依赖OpenGL库，所以重新配置相关环境。

一、开发环境

1.内核版本

root@marsboard:~# uname -a
Linux marsboard 4.1.15 #1 SMP PREEMPT Mon Dec 19 13:55:17 CST 2016 armv7l GNU/Linux

2.文件系统

采用yocto编译出来的对应的内核4.1.15版本的文件系统

3.Qt版本

采用qt5.9.4版本，下载源码手动编译的qt库（编译时配置了OpenGL的路径，具体后面再详述）

4.硬件

开发板采用的是天嵌imx6Q系列，uboot和内核也是移植的官方提供的4.1.15版本（可以从天嵌官网提供的百度网盘下载）。

注意据官方资料imx6 Sololite不支持OpenGL，

二、Qt库移植及Qt程序运行

1.库移植

虚拟机上编译出来的库文件如下：

将qt库移植到开发板，lib拷贝到了/usr/lib，plugins、qml拷贝到了/usr/lib/qt5

2.Qt程序的编译

如果自己编译Qt库，那就需要手动修改路径cd /usr/lib/x86_64-linux-gnu/qt-default/qtchooser/会有一个default.conf配置文件，可以修改默认配置文件为你编译好的Qt库路径，具体不再详述。

3.运行环境变量配置

root@marsboard:~# export EGLFS_DEVICE_INTEGRATION= eglfs_viv
root@marsboard:~# export QT_QPA_PLATFORM=eglfs
root@marsboard:~# ls
bright
root@marsboard:~# ./bright 
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QEglFSVivIntegration will set environment variable FB_MULTI_BUFFER=2 to enable double buffering and vsync.
 If this is not desired, you can override this via: export QT_EGLFS_IMX6_NO_FB_MULTI_BUFFER=1
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
Facade::initializeCommand()
ApplicationFacade::initializeCommand()
Facade::initializeCommand()
QMetaObject::connectSlotsByName: No matching signal for on_toolButton_clicked()

write begin at "01:47:36.388" >>>>>>>>>>>>>>>>>>>>
<<<<<<<<<<<<<<<<<< write finished at "01:47:36.388" 

qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
qrc:/qml/PowerSetting.qml:2:1: module "QtQuick.Controls" is not installed
qrc:/qml/PowerSetting.qml:5:1: module "QtQuick.Extras" is not installed
qrc:/qml/PowerSetting.qml:1:1: module "QtQuick" is not installed
qrc:/qml/PowerSetting.qml:6:1: module "QtQuick.Controls.Styles" is not installed
qrc:/qml/PowerSetting.qml:3:1: module "QtQuick.Layouts" is not installed
qrc:/qml/PowerSetting.qml:4:1: module "QtQuick.Dialogs" is not installed
QObject::connect: Cannot connect (null)::sendPowerValueToWidget(QString) to CentralPanel::on_setPowerData(QString)
QObject::connect: Cannot connect CentralPanel::sigSendPowerInitData(QString) to (null)::recFromWidget(QString)
QObject::connect: Cannot connect (null)::closeView() to QQuickWidget::close()
root@marsboard:~# ^C
root@marsboard:~# export   QML2_IMPORT_PATH=/usr/lib/qt5/qml
root@marsboard:~# ./bright 
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QEglFSVivIntegration will set environment variable FB_MULTI_BUFFER=2 to enable double buffering and vsync.
 If this is not desired, you can override this via: export QT_EGLFS_IMX6_NO_FB_MULTI_BUFFER=1
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
Facade::initializeCommand()
ApplicationFacade::initializeCommand()
Facade::initializeCommand()
QMetaObject::connectSlotsByName: No matching signal for on_toolButton_clicked()

write begin at "01:53:06.210" >>>>>>>>>>>>>>>>>>>>
<<<<<<<<<<<<<<<<<< write finished at "01:53:06.211" 

如上所述，环境变量配置完毕就可以看到界面了，qml页面正常加载。

总结：

1.QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'这个好像不影响页面显示

2.天嵌官方提供的4.1.15内核支持OpenGL，这点很重要