[Qt] Failed to load platform plugin "xcb"

While executing Qt application, "cannot load xcb" message could be shown on the screen if you did not configure the followings.

Ref.

https://forum.qt.io/topic/58499/solved-problems-with-setting-paths-to-libs-and-plugins-in-qt-app-s-executable-file/3

MyAppDeployment

 +- lib

 |   +- libQt5...so

 +- plugins

 |   +- platform

 |       +- libqxcb.so  <--

 |       +- libqlinuxfb.so

 |       +- ...

 +- qml

 |   +- QtQuick

 |       +- Window.2

 |           +- libwindowplugin.so

 |           +- qmldir

 |   +- QtQuick.2

 |       +- libqtquick2plugin.so

 |       +- qmldir

 +- MyApp*

1. 

the following Qt variables must be set in order to execute your Qt application.

#!/bin/sh

export LD_LIBRARY_PATH=`pwd`/lib

export QT_PLUGIN_PATH=`pwd`/plugins

export QML2_IMPORT_PATH=`pwd`/qml

./MyApp

or

2. 

qt.conf

adding resources

[Paths]

Prefix=./

Libraries=lib

Plugins=plugins

Qml2Imports=qml

build the app with the qt.conf file

3. 

RPATH의 사용은 .pro file에 한 라인만 추가하면 됨

(http://www.tripleboot.org/?p=536#PluginDLLs)

app's .pro

    QMAKE_LFLAGS += -Wl,--rpath=\$ORIGIN/lib

    QMAKE_LFLAGS += -Wl,-rpath,"'$ORIGIN/lib'"

test

chrpath -r \$ORIGIN/lib VeniceClassicRadioPlayer