QtWebengine build error with opus and silk codecs



  • This is like my fourth or fifth post regarding QtWebengine. I am almost spaming the Qt forum i guess.
    I am trying to build Qt5.91 with QtWebengine for an arm platform.
    These are some architecture based arguments i am passing to the build.

    QMAKE_CFLAGS_RELEASE += -march=armv7-a -mcpu=cortex-a9 
    QMAKE_CXXFLAGS_RELEASE += -march=armv7-a -mcpu=cortex-a9
    

    By default the build is going these values as well.

    -mfloat-abi=hard -mtune=generic-armv7-a -mfpu=vfpv3-d16 -mthumb
    

    Below is my configuration summary

    Building on: linux-g++ (i386, CPU features: <none>)
    Building for: linux-arm-g++ (arm, CPU features: <none>)
    Configuration: cross_compile compile_examples enable_new_dtags largefile precompile_header shared rpath release c++11 concurrent dbus mremap reduce_exports stl
    Build options:
      Mode ................................... release
      Optimize release build for size ........ no
      Building shared libraries .............. yes
      Using C++ standard ..................... C++11
      Using gold linker ...................... no
      Using new DTAGS ........................ yes
      Using precompiled headers .............. yes
      Using LTCG ............................. no
      Target compiler supports:
        NEON ................................. no
      Build parts ............................ libs
    Qt modules and options:
      Qt Concurrent .......................... yes
      Qt D-Bus ............................... yes
      Qt D-Bus directly linked to libdbus .... no
      Qt Gui ................................. yes
      Qt Network ............................. yes
      Qt Sql ................................. yes
      Qt Testlib ............................. yes
      Qt Widgets ............................. yes
      Qt Xml ................................. yes
    Support enabled for:
      Using pkg-config ....................... yes
      QML debugging .......................... yes
      udev ................................... yes
      Using system zlib ...................... yes
    Qt Core:
      DoubleConversion ....................... yes
        Using system DoubleConversion ........ no
      GLib ................................... no
      iconv .................................. yes
      ICU .................................... no
      Logging backends:
        journald ............................. no
        syslog ............................... no
        slog2 ................................ no
      Using system PCRE2 ..................... no
    Qt Network:
      getaddrinfo() .......................... yes
      getifaddrs() ........................... yes
      IPv6 ifname ............................ yes
      libproxy ............................... no
      OpenSSL ................................ no
        Qt directly linked to OpenSSL ........ no
      SCTP ................................... no
      Use system proxies ..................... yes
    Qt Gui:
      Accessibility .......................... yes
      FreeType ............................... yes
        Using system FreeType ................ yes
      HarfBuzz ............................... yes
        Using system HarfBuzz ................ no
      Fontconfig ............................. yes
      Image formats:
        GIF .................................. yes
        ICO .................................. yes
        JPEG ................................. yes
          Using system libjpeg ............... no
        PNG .................................. yes
          Using system libpng ................ no
      EGL .................................... yes
      OpenVG ................................. no
      OpenGL:
        Desktop OpenGL ....................... no
        OpenGL ES 2.0 ........................ yes
        OpenGL ES 3.0 ........................ yes
        OpenGL ES 3.1 ........................ yes
      Session Management ..................... yes
    Features used by QPA backends:
      evdev .................................. yes
      libinput ............................... no
      INTEGRITY HID .......................... no
      mtdev .................................. no
      tslib .................................. no
      xkbcommon-evdev ........................ no
    QPA backends:
      DirectFB ............................... no
      EGLFS .................................. yes
      EGLFS details:
        EGLFS i.Mx6 .......................... no
        EGLFS i.Mx6 Wayland .................. no
        EGLFS EGLDevice ...................... no
        EGLFS GBM ............................ no
        EGLFS Mali ........................... no
        EGLFS Raspberry Pi ................... no
        EGL on X11 ........................... no
      LinuxFB ................................ yes
      VNC .................................... yes
      Mir client ............................. no
    Qt Widgets:
      GTK+ ................................... no
      Styles ................................. Fusion Windows
    Qt PrintSupport:
      CUPS ................................... no
    Qt Sql:
      DB2 (IBM) .............................. no
      InterBase .............................. no
      MySql .................................. no
      OCI (Oracle) ........................... no
      ODBC ................................... no
      PostgreSQL ............................. no
      SQLite2 ................................ no
      SQLite ................................. yes
        Using system provided SQLite ......... no
      TDS (Sybase) ........................... no
    QtXmlPatterns:
      XML schema support ..................... yes
    Qt QML:
      QML interpreter ........................ yes
      QML network support .................... yes
    Qt Quick:
      Direct3D 12 ............................ no
      AnimatedImage item ..................... yes
      Canvas item ............................ yes
      Support for Qt Quick Designer .......... yes
      Flipable item .......................... yes
      GridView item .......................... yes
      ListView item .......................... yes
      Path support ........................... yes
      PathView item .......................... yes
      Positioner items ....................... yes
      ShaderEffect item ...................... yes
      Sprite item ............................ yes
    Qt Gamepad:
      SDL2 ................................... no
    Qt Bluetooth:
      BlueZ .................................. no
      BlueZ Low Energy ....................... no
      Linux Crypto API ....................... no
    Qt Sensors:
      sensorfw ............................... no
    Qt Multimedia:
      ALSA ................................... yes
      GStreamer 1.0 .......................... no
      GStreamer 0.10 ......................... no
      Video for Linux ........................ yes
      OpenAL ................................. no
      PulseAudio ............................. no
      Resource Policy (libresourceqt5) ....... no
      Windows Audio Services ................. no
      DirectShow ............................. no
      Windows Media Foundation ............... no
    Qt Quick Controls 2:
      Styles ................................. Default Material Universal
    Qt Quick Templates 2:
      Hover support .......................... yes
      Multi-touch support .................... yes
    Qt Location:
      Gypsy GPS Daemon ....................... no
      WinRT Geolocation API .................. no
    Qt WebEngine:
      Embedded build ......................... yes
      Pepper Plugins ......................... no
      Printing and PDF ....................... no
      Proprietary Codecs ..................... yes
      Spellchecker ........................... yes
      WebRTC ................................. no
      Using system ninja ..................... no
      ALSA ................................... yes
      PulseAudio ............................. no
      System libraries:
        ICU .................................. no
        libwebp and libwebpdemux ............. no
        Opus ................................. no
        ffmpeg ............................... no
    
    Note: Also available for Linux: linux-clang linux-icc
    

    This is the error i am getting.
    Now my question is, is it absolutely necessary to use opus and silk for QtWebengine ? If not, how can i avoid it ?
    Also why the build is trying to force -mfloat-abi=softfp and -mfpu=neon ?
    I did try a build with -mfpu=neon and it is giving me undefined reference to many variiables.

    Thank you for your time.

    Edit
    I tried passing -no-opus to the configuration and still got the same error.


  • Moderators

    @name_qt The error message suggests a solution: -mfloat-abi=softfp -mfpu=neon

    /opt/arm400-linux/lib/gcc/arm400-linux-gnueabi/4.8.3/include/arm_neon.h:32:2: error: #error You must enable NEON instructions (e.g. -mfloat-abi=softfp -mfpu=neon) to use arm_neon.h
    

    Try to add -mfpu=neon



  • @jsulm I have tried that too.

    I did try a build with -mfpu=neon and it is giving me undefined reference to many variiables.
    


  • Does anyone have any suggestions ? I am stuck with this for the last couple of days.

    I cross compiled opus separately and linked it with the Qt build. Now the error is something like this.

    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: error: /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/core/libcore_generated.a(CSSOMKeywords.o) uses VFP register arguments, libQt5WebEngineCore.so.5.9.1 does not
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: failed to merge target specific data of file /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/core/libcore_generated.a(CSSOMKeywords.o)
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: error: /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/bindings/core/v8/libbindings_core_impl.a(V8StyleMedia.o) uses VFP register arguments, libQt5WebEngineCore.so.5.9.1 does not
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: failed to merge target specific data of file /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/bindings/core/v8/libbindings_core_impl.a(V8StyleMedia.o)
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: error: /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/core/css/libcss_1.a(CSSRuleList.o) uses VFP register arguments, libQt5WebEngineCore.so.5.9.1 does not
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: failed to merge target specific data of file /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/core/css/libcss_1.a(CSSRuleList.o)
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: error: /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/core/css/libcss_2.a(MediaValuesInitialViewport.o) uses VFP register arguments, libQt5WebEngineCore.so.5.9.1 does not
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: failed to merge target specific data of file /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/core/css/libcss_2.a(MediaValuesInitialViewport.o)
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: error: /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/core/layout/svg/libsvg.a(LayoutSVGTSpan.o) uses VFP register arguments, libQt5WebEngineCore.so.5.9.1 does not
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: failed to merge target specific data of file /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/third_party/WebKit/Source/core/layout/svg/libsvg.a(LayoutSVGTSpan.o)
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: error: /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/ui/gl/libgl_wrapper.a(gl_image_egl.o) uses VFP register arguments, libQt5WebEngineCore.so.5.9.1 does not
    /opt/arm400-linux/bin/../lib/gcc/arm400-linux-gnueabi/4.8.3/../../../../arm400-linux-gnueabi/bin/ld: failed to merge target specific data of file /opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core/Release/obj/ui/gl/libgl_wrapper.a(gl_image_egl.o)
    collect2: error: ld returned 1 exit status
    Makefile.core_module:81: recipe for target '../../lib/libQt5WebEngineCore.so.5.9.1' failed
    make[4]: *** [../../lib/libQt5WebEngineCore.so.5.9.1] Error 1
    make[4]: Leaving directory '/opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core'
    Makefile:122: recipe for target 'sub-core_module-pro-make_first' failed
    make[3]: *** [sub-core_module-pro-make_first] Error 2
    make[3]: Leaving directory '/opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src/core'
    Makefile:77: recipe for target 'sub-core-make_first' failed
    make[2]: *** [sub-core-make_first] Error 2
    make[2]: Leaving directory '/opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine/src'
    Makefile:46: recipe for target 'sub-src-make_first' failed
    make[1]: *** [sub-src-make_first] Error 2
    make[1]: Leaving directory '/opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.1/qtwebengine'
    Makefile:834: recipe for target 'module-qtwebengine-make_first' failed
    make: *** [module-qtwebengine-make_first] Error 2
    

  • Lifetime Qt Champion

    Hi,

    From the error message, one is built for soft-float and the other for hard-float. You should check the compilation flags that were used.



  • @SGaist Is it necessary to have neon support in the chip architecture to compile and run qtwebengine or for these codecs ?
    How can I avoid using neon in the build ?


  • Lifetime Qt Champion

    I don't know, but I don't think so but thumb instructions have several advantages that are pretty interesting in the embedded world. You should rather consider enabling it.



  • @SGaist AFAIK, emulating neon in software will bring performance loss. My particular CPU hardware does not support neon and thereby, isn't it safe to disable it then ?
    My CPU (cortex a9) does not support neon nor does the compiler.
    -print-multi-lib gives

    armv5te_arm9;@mcpu=arm926ej-s
    a9;@mcpu=cortex-a9
    a7;@mcpu=cortex-a7
    armv5te_arm9_soft;@mcpu=arm926ej-s@mfloat-abi=soft
    armv5te_arm9_vfp;@mcpu=arm926ej-s@mfloat-abi=softfp@mfpu=vfp
    a9_soft;@mcpu=cortex-a9@mfloat-abi=soft
    a9_softfp_vfp;@mcpu=cortex-a9@mfloat-abi=softfp@mfpu=vfp
    a9_softfp_vfpv3-d16;@mcpu=cortex-a9@mfloat-abi=softfp@mfpu=vfpv3-d16
    a7_soft;@mcpu=cortex-a7@mfloat-abi=soft
    a7_softfp_vfpv4;@mcpu=cortex-a7@mfloat-abi=softfp@mfpu=vfpv4
    a7_softfp_neon-vfpv4;@mcpu=cortex-a7@mfloat-abi=softfp@mfpu=neon-vfpv4
    a7_hard_neon-vfpv4;@mcpu=cortex-a7@mfloat-abi=hard@mfpu=neon-vfpv4
    

    I am stuck with this error now

    libxxxx.a(yyyyy.o) uses VFP register arguments, libQt5WebEngineCore.so.5.9.1 does not
    

  • Lifetime Qt Champion

    Then you should create your own mkspecs that sets the correct flags for your processor.



  • @SGaist I am using my own qmake.conf.

    #
    # qmake configuration for building with arm400-linux-g++
    #
    
    MAKEFILE_GENERATOR      = UNIX
    CONFIG                 += incremental
    QMAKE_INCREMENTAL_STYLE = sublib
    
    
    include(../common/linux.conf)
    include(../common/gcc-base-unix.conf)
    include(../common/g++-unix.conf)
    
    # modifications to g++.conf
    QMAKE_INCDIR +=/opt/arm400-linux/target/usr/include 
    QMAKE_LIBDIR +=/opt/arm400-linux/target/usr/lib
    QMAKE_CC                = arm400-linux-gcc 
    QMAKE_CXX               = arm400-linux-g++
    QMAKE_LINK              = arm400-linux-g++ -L/opt/arm400-linux/target/usr/lib -Wl,-rpath -Wl,/opt/arm400-linux/target/usr/lib
    QMAKE_LINK_SHLIB        = arm400-linux-g++ -L/opt/arm400-linux/target/usr/lib -Wl,-rpath -Wl,/opt/arm400-linux/target/usr/lib
    
    QMAKE_CFLAGS_RELEASE += -march=armv7-a -mcpu=cortex-a9
    QMAKE_CXXFLAGS_RELEASE += -march=armv7-a -mcpu=cortex-a9
    
    # modifications to linux.conf
    QMAKE_AR                = arm400-linux-ar cqs
    QMAKE_OBJCOPY           = arm400-linux-objcopy
    QMAKE_STRIP             = arm400-linux-strip
    
    load(qt_config)
    

    I tried

    QMAKE_CFLAGS_RELEASE += -march=armv7-a -mcpu=cortex-a9 -mfloat-abi=soft
    QMAKE_CXXFLAGS_RELEASE += -march=armv7-a -mcpu=cortex-a9 -mfloat-abi=soft
    

    But it came out something like "arm400-linux-g++: error: -mfloat-abi=soft and -mfloat-abi=hard may not be used together".


  • Lifetime Qt Champion

    From the looks of it, your system looks like the linux-tegra2-g++ mkspec, maybe this one will be more suited to copy from.



  • @SGaist
    I have tried all these combinations

    -mcpu=cortex-a9 -mfloat-abi=softfp -mfpu=vfp
    
    -mcpu=cortex-a9 -mfloat-abi=softfp -mfpu=vfpv3-d16
    
    -mtune=cortex-a9 -march=armv7-a -mhard-float -mfloat-abi=softfp 
    -mfpu=vfpv3-d16
    

    and i got the same error

    libxxxx.a(yyyyy.o) uses VFP register arguments, libQt5WebEngineCore.so.5.9.1 does not
    

    I tried the tegra2 mkspecs, but again another error.

    ERROR at //build/config/android/internal_rules.gni:11:1: Assertion failed.
    assert(is_android)
    ^-----
    See //build/config/android/rules.gni:8:1: whence it was imported.
    import("//build/config/android/internal_rules.gni")
    ^-------------------------------------------------
    See //third_party/android_tools/BUILD.gn:5:1: whence it was imported.
    import("//build/config/android/rules.gni")
    ^----------------------------------------
    See //third_party/openmax_dl/dl/BUILD.gn:199:16: which caused the file to be included.
          deps = [ "//third_party/android_tools:cpu_features" ]
                   ^-----------------------------------------
    Project ERROR: GN run error!
    Makefile:80: recipe for target 'sub-gn_run-pro-make_first' failed
    make[3]: *** [sub-gn_run-pro-make_first] Error 3
    make[3]: Leaving directory '/opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.2/qtwebengine/src/core'
    Makefile:77: recipe for target 'sub-core-make_first' failed
    make[2]: *** [sub-core-make_first] Error 2
    make[2]: Leaving directory '/opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.2/qtwebengine/src'
    Makefile:46: recipe for target 'sub-src-make_first' failed
    make[1]: *** [sub-src-make_first] Error 2
    make[1]: Leaving directory '/opt/qt/qt5.9.1arm_source/qt-everywhere-opensource-src-5.9.2/qtwebengine'
    Makefile:834: recipe for target 'module-qtwebengine-make_first' failed
    make: *** [module-qtwebengine-make_first] Error 2
    

  • Lifetime Qt Champion

    Might be a silly question but did you nuke properly the build folder between tries ?



  • @SGaist I am deleting the source folder and doing all the steps from the beginning each and everytime.


  • Lifetime Qt Champion

    Ok, so when you said you tried the Tegra2 mkspec, did you just use it or did you copy from it into yours like I suggested ?



  • @SGaist This is how i used it.

    include(../common/linux_device_pre.conf)
    
    QMAKE_INCDIR_POST      += $$[QT_SYSROOT]/usr/include
    
    QMAKE_LIBDIR_POST      += $$[QT_SYSROOT]/usr/lib
    
    QMAKE_RPATHLINKDIR_POST += $$[QT_SYSROOT]/usr/lib
    
    QMAKE_CFLAGS           += -mtune=cortex-a9 -march=armv7-a -mhard-float -mfloat-abi=softfp -mfpu=vfpv3-d16
    QMAKE_CXXFLAGS         += -mtune=cortex-a9 -march=armv7-a -mhard-float -mfloat-abi=softfp -mfpu=vfpv3-d16
    
    include(../common/linux_arm_device_post.conf)
    
    load(qt_config)
    

    This is my qmake.conf.



  • Does anyone knows how ninja build in qtwebengine is getting these architecture values by default ?

    -mfloat-abi=hard -mtune=generic-armv7-a -mfpu=vfpv3-d16 -mthumb
    

  • Lifetime Qt Champion

    From a quick look, somewhere around:

    src/3rdparty/chromium/breakpad/src/build/common.gypi
    src/3rdparty/chromium/build/config/compiler/BUILD.gn
    src/3rdparty/chromium/build/common.gypi
    src/3rdparty/chromium/native_client/build/standalone_flags.gypi
    src/3rdparty/chromium/native_client/build/untrusted.gypi
    ./src/core/config/linux.pri:    MFLOAT = $$extractCFlag("-mfloat-abi=.*")
    


  • Thanks @SGaist. This file had some information. I am not sure with the syntax to make changes in this file.

    ./src/core/config/linux.pri:    MFLOAT = $$extractCFlag("-mfloat-abi=.*")
    

    Whatever values I am giving to QMAKE_CFLAGS_RELEASE and QMAKE_CXXXFLAGS_RELEASE is not what GN build is taking.

    Maybe if I figure out how to make changes in the file you have mentioned, I might be able to solve this issue.



  • In the file

    qtwebengine/src/3rdparty/chromium/third_party/opus/BUILD.gn:     use_opus_rtcd = current_cpu == "arm" && (is_win || is_android || is_linux)
    
    qtwebengine/src/3rdparty/chromium/third_party/opus/BUILD.gn: 
     if (use_opus_rtcd) {
          sources += [
            "$target_gen_dir/celt_pitch_xcorr_arm_gnu.S",
            "src/celt/arm/arm_celt_map.c",
            "src/celt/arm/armcpu.c",
            "src/celt/arm/armcpu.h",
            "src/celt/arm/celt_neon_intr.c",
            "src/celt/arm/fft_arm.h",
            "src/celt/arm/mdct_arm.h",
            "src/celt/arm/pitch_arm.h",
            "src/silk/arm/NSQ_neon.c",
            "src/silk/arm/NSQ_neon.h",
            "src/silk/arm/arm_silk_map.c",
          ]
    

    As far as I understood if the CPU is based on ARM and the OS is linux use_opus_rtcd becomes TRUE. If it becomes true, qtwebengine/src/3rdparty/chromium/third_party/opus/src/celt/arm/armcpu.c decides whether it have the NEON capabilities. I am trying to see that changing armcpu.c to not to use NEON might work or not.



  • The chromium snapshot is outdated. There is already a fix for that!

    link text


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