QT應用啟動失敗排查方法小結

更新時間：2023年09月12日 15:18:29 作者：samxfb

啟動QT應用經常會碰到應用啟動失敗,qt platform plugin無法啟動,本文就來介紹一下QT應用啟動失敗排查方法小結,具有一定的參考價值,感興趣的可以了解以下

背景

啟動QT應用經常會碰到應用啟動失敗，qt platform plugin無法啟動，比如：

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb.

Aborted (core dumped)

排查辦法

打開QT Plugin加載調試開關

export QT_DEBUG_PLUGINS=1

重新啟動應用，會得到更詳細的錯誤信息，如下

QFactoryLoader::QFactoryLoader() checking directory path "/home/netease/working/hermes/pc_mac/build/bin/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/libqxcb.so"
Found metadata in lib /home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 331520
}
Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/netease/working/hermes/pc_mac/build/bin/platforms" ...
Cannot load library /home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/libqxcb.so: (libxcb-xinput.so.0: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/libqxcb.so" : "Cannot load library /home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/libqxcb.so: (libxcb-xinput.so.0: cannot open shared object file: No such file or directory)"
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: xcb.
Aborted (core dumped)

可以看出根本原因是Cannot load library /home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/libqxcb.so: (libxcb-xinput.so.0: cannot open shared object file: No such file or directory)加載不了libqxcb.so, 依賴的動態(tài)庫libxcb-xinput.so.0找不到, ldd查看如下：

[netease@netease-Precision-3630-Tower ~/working/hermes/pc_mac/build/bin]$ ldd /home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/libqxcb.so
        linux-vdso.so.1 (0x00007ffc3330b000)
        libQt5XcbQpa.so.5 => /home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/../../lib/libQt5XcbQpa.so.5 (0x00007fc35406c000)
        libQt5Gui.so.5 => /home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/../../lib/libQt5Gui.so.5 (0x00007fc353800000)
        libQt5Core.so.5 => /home/netease/working/hermes/pc_mac/build/bin/plugins/platforms/../../lib/libQt5Core.so.5 (0x00007fc352b8f000)
        libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fc352806000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fc352415000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fc3521f6000)
        libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007fc351ff4000)
        libxcb-icccm.so.4 => /usr/lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007fc351def000)
        libxcb-image.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007fc351bea000)
        libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007fc3519e7000)
        libxcb-keysyms.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007fc3517e4000)
        libxcb-randr.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007fc3515d4000)
        libxcb-render-util.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007fc3513d0000)
        libxcb-render.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007fc3511c3000)
        libxcb-shape.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007fc350fbf000)
        libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007fc350db8000)
        libxcb-xfixes.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007fc350bb0000)
        libxcb-xinerama.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xinerama.so.0 (0x00007fc3509ad000)
        libxcb-xinput.so.0 => not found
        libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007fc350675000)
        libSM.so.6 => /usr/lib/x86_64-linux-gnu/libSM.so.6 (0x00007fc35046d000)
        libICE.so.6 => /usr/lib/x86_64-linux-gnu/libICE.so.6 (0x00007fc350252000)
        libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fc35002a000)
        libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007fc34fe0e000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fc34fa70000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fc34f858000)
        libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007fc34f5cc000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fc34f3c8000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fc35477b000)
        libxcb-util.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-util.so.1 (0x00007fc34f1c2000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007fc34efbb000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007fc34eda6000)
        libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007fc34eba2000)
        libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fc34e99c000)
        libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fc34e76b000)
        libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fc34e4b5000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fc34e2ad000)

確實是 libxcb-xinput.so.0 => not found