CODEWITHSUNDEEP
androidqt5android-sourcewindows-subsystem-for-linuxxcb
Idan Banani
Idan Banani

Reputation: 141

WSL2 - AOSP 11 emulator failed to start because no Qt platform plugin could be initialized (xcb)

I'm trying to build AOSP for android 11 on WSL2 Ubuntu 20 on my x86-64 machine (Intel cpu), the build (for aosp_arm64-eng) was successfull but the emulator won't run on my WSL2.

I've tried applying fixes I've found on the net but nothing helped (modifying env variables, installing libs etc. (I haven't tried the LD_PRELOAD trick yet) I think it tries to use the Qt within the repo).

(also see: "Failed to load platform plugin "xcb" " while launching qt5 app on linux without qt installed )

the flow was:

$ repo init -u https://android.googlesource.com/platform/manifest -b android-11.0.0_r50
$ repo sync
$ source build/envsetup.sh
$ lunch aosp_arm64-eng
$ m -j4
[build was successfull]

$ emulator
WARNING: encryption is off
INFO: QtLogger.cpp:68: Warning: could not connect to display  ((null):0, (null))


INFO: QtLogger.cpp:68: Info: Could not load the Qt platform plugin "xcb" in "/home/idan/WORKING_DIRECTORY/prebuilts/android-emulator/linux-x86_64/lib64/qt/plugins" even though it was found. ((null):0, (null))


Fatal: 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.
 ((null):0, (null))
INFO: QtLogger.cpp:68: Fatal: 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.
 ((null):0, (null))


Aborted


$ which emulator
/home/idan/WORKING_DIRECTORY/prebuilts/android-emulator/linux-x86_64/emulator

ldd output for emulator:

    linux-vdso.so.1 (0x00007ffe785b7000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f7e5d483000)
    libc++.so.1 => /home/idan/WORKING_DIRECTORY/prebuilts/android-emulator/linux-x86_64/lib64/libc++.so.1 (0x00007f7e5d3a4000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f7e5d255000)
    libtcmalloc_minimal.so.4 => /home/idan/WORKING_DIRECTORY/prebuilts/android-emulator/linux-x86_64/lib64/libtcmalloc_minimal.so.4 (0x00007f7e5ce64000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f7e5ce59000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f7e5ce34000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f7e5ce19000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7e5cc27000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f7e5d4a2000)

inside the following folder I have these .so files:

~/WORKING_DIRECTORY/prebuilts/android-emulator/linux-x86_64/lib64/qt/lib$ ls
    libQt5CoreAndroidEmu.so.5          libQt5SvgAndroidEmu.so.5      libX11-xcb.so.1.0.0  libxcb-xkb.so.1        libxkbcommon-x11.so.0.0.0
    libQt5DBusAndroidEmu.so.5          libQt5WidgetsAndroidEmu.so.5  libfontconfig.so.1   libxcb-xkb.so.1.0      libxkbcommon.so
    libQt5GuiAndroidEmu.so.5           libQt5XcbQpaAndroidEmu.so.5   libfreetype.so.6     libxcb-xkb.so.1.0.0    libxkbcommon.so.0
    libQt5NetworkAndroidEmu.so.5       libX11-xcb.so.1               libsoftokn3.so       libxkbcommon-x11.so    libxkbcommon.so.0.0.0
    libQt5PrintSupportAndroidEmu.so.5  libX11-xcb.so.1.0             libsqlite3.so        libxkbcommon-x11.so.0

and inside plugins:

~/WORKING_DIRECTORY/prebuilts/android-emulator/linux-x86_64/lib64/qt/plugins/platforms$ ls
    libqxcb.so

$ ldd libqxcb.so
linux-vdso.so.1 (0x00007fff4bf5b000)
        libQt5XcbQpaAndroidEmu.so.5 => not found
        libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f3b43599000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f3b434da000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f3b434be000)
        libQt5GuiAndroidEmu.so.5 => not found
        libQt5DBusAndroidEmu.so.5 => not found
        libQt5CoreAndroidEmu.so.5 => not found
        libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f3b43434000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f3b43411000)
        libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f3b4340c000)
        libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f3b433e2000)
        libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f3b433cd000)
        libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f3b4328e000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f3b4313f000)
        libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f3b43134000)
        libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f3b430f2000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f3b430ec000)
        libc++.so.1 => /lib/x86_64-linux-gnu/libc++.so.1 (0x00007f3b4302a000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f3b4300d000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3b42e1b000)
        libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f3b42ded000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f3b42de4000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f3b42dac000)
        libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f3b42cf4000)
        libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f3b42cbe000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f3b435fe000)
        libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f3b42cb8000)
        libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f3b42cb0000)
        libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f3b42c92000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f3b42c87000)
        libc++abi.so.1 => /lib/x86_64-linux-gnu/libc++abi.so.1 (0x00007f3b42c4d000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f3b42c33000)

Upvotes: 2

Views: 3927

Answers (3)

Syed Waris
Syed Waris

Reputation: 1074

Inside plugins when you did ....

$ ldd libqxcb.so
        linux-vdso.so.1 (0x00007fff4bf5b000)
        libQt5XcbQpaAndroidEmu.so.5 => not found
        libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f3b43599000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f3b434da000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f3b434be000)
        libQt5GuiAndroidEmu.so.5 => not found
        libQt5DBusAndroidEmu.so.5 => not found
        libQt5CoreAndroidEmu.so.5 => not found

Many of the libs were not found. But these libs are present in prebuilts/android-emulator/linux-x86_64/lib64/qt/lib/.

You just need to copy these libs to /lib/x86_64-linux-gnu/

Upvotes: 0

Idan Banani
Idan Banani

Reputation: 141

Well, eventually I tried it on a remote ssh connection to a linux server and got a similar error.

The thing is that the emulator need a graphical environment. So either use grab the build output image and use it in Android studio or use a vncserver (and client) to connect to it from a GUI environment.

Upvotes: 0

Martin Zeitler
Martin Zeitler

Reputation: 76797

Assuming WSL2, just try to install it system-wide:

sudo apt-get install libx11-xcb1

or whatever else may provivde libqxcb.so.

The overall performance may be better when running directly on Windows & HAXM.
I'd just wonder, how well WSL2 would handle KVM, as it may itself be an emulation.
Building on WSL2 isn't the problem, but running the emulator without KVM is: https://boxofcables.dev/kvm-optimized-custom-kernel-wsl2-2022/

Upvotes: 1

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