compiling qt webengine fail

[SherifOmran]

I have a program written in qt using qtwebengine. When i compile it on linux it works. however when i use the pi cross compiler i get the following message

Project ERROR: Unknown module(s) in QT: webengine webenginewidget

The installation went

i tried to reinstall the qtwebengine using this

/opt/qt5pi/qt-everywhere-src-5.10.1/qtwebengine$ ../../qt5build/qtbase/bin/qmake -r

but i get this

Running configuration tests...
Checking for alsa... yes
Checking for bison... yes
Checking for embedded... yes
Checking for flex... no
Checking for gperf... yes
Checking for host pkg-config... /usr/bin/pkg-config
Checking for pulseaudio >= 0.9.10... yes
Checking for python2... /usr/bin/python2
Checking for d-bus... yes
Checking for fontconfig... yes
Checking for glib-2.0 >= 2.32.0... yes
Checking for glibc > 2.16... yes
Checking for harfbuzz >= 1.4.2... yes
Checking for jsoncpp... yes
Checking for khr... yes
Checking for libdrm... yes
Checking for libevent... yes
Checking for srtp... no
Checking for libvpx... no
Checking for libwebp, libwebpmux and libwebpdemux... yes
Checking for libxml2 and libxslt... yes
Checking for libxml2 configured with icuuc... yes
Checking for minizip... yes
Checking for system ninja... no
Checking for nss... yes
Checking for opus... yes
Checking for libpng >= 1.6.0... yes
Checking for protobuf... yes
Checking for protoc... no
Checking for re2... no
Checking for snappy... no
Checking for xcomposite... no
Checking for xcursor... no
Checking for xi... no
Checking for xrandr... no
Checking for xtst... no
Checking for zlib... yes
Checking for host compiler... no
Done running configuration tests.

Configure summary:

Qt WebEngine:
  Embedded build ......................... yes
  Pepper Plugins ......................... no
  Printing and PDF ....................... no
  Proprietary Codecs ..................... no
  Spellchecker ........................... yes
  Native Spellchecker .................... no
  WebRTC ................................. no
  Use System Ninja ....................... no
  Geolocation ............................ no
  Use v8 snapshot ........................ yes
  Use ALSA ............................... yes
  Use PulseAudio ......................... yes
  Optional system libraries used:
    re2 .................................. no
    icu .................................. no
    libwebp, libwebpmux and libwebpdemux . yes
    opus ................................. yes
    ffmpeg ............................... no
    libvpx ............................... no
    snappy ............................... no
    libsrtp .............................. no
    glib ................................. yes
    zlib ................................. yes
    minizip .............................. yes
    libevent ............................. yes
    jsoncpp .............................. yes
    protobuf ............................. no
    libxml2 and libxslt .................. yes
    lcms2 ................................ no
    png .................................. yes
    harfbuzz ............................. yes
  Required system libraries:
    fontconfig ........................... yes
    dbus ................................. yes
    nss .................................. yes
    khr .................................. yes
    glibc ................................ yes
  Required system libraries for qpa-xcb:
    libdrm ............................... yes
    xcomposite ........................... no
    xcursor .............................. no
    xi ................................... no
    xrandr ............................... no
    xtst ................................. no

Note: Dropped compiler flags '-pthread' when detecting library 'webengine-protobuf'.

WARNING: flex is required to build QtWebEngine.

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/opt/qt5pi/sysroot/usr/local/qt5pi'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

 
Static builds of QtWebEngine aren't supported.
QtWebEngine will not be built.

what is flex and how to build it?

thanks

[SherifOmran]

I installed the following dependencies

https://wiki.qt.io/QtWebEngine/How_to_Try

then i tried downloading the source alone of webengine

http://www.linuxfromscratch.org/blfs/view/cvs/x/qtwebengine.html

sherif@sherif-MacBookPro:/opt/qt5pi/qtwebengine-everywhere-src-5.10.1$ ../qt5build/qtbase/qmake/qmake -r
Info: creating stash file /opt/qt5pi/qtwebengine-everywhere-src-5.10.1/.qmake.stash
Info: creating cache file /opt/qt5pi/qtwebengine-everywhere-src-5.10.1/.qmake.cache

Running configuration tests...
Checking for alsa... yes
Checking for bison... yes
Checking for embedded... yes
Checking for flex... yes
Checking for gperf... yes
Checking for host pkg-config... /usr/bin/pkg-config
Checking for pulseaudio >= 0.9.10... yes
Checking for python2... /usr/bin/python2
Checking for d-bus... yes
Checking for fontconfig... yes
Checking for glib-2.0 >= 2.32.0... yes
Checking for glibc > 2.16... yes
Checking for harfbuzz >= 1.4.2... yes
Checking for jsoncpp... yes
Checking for khr... yes
Checking for libdrm... yes
Checking for libevent... yes
Checking for srtp... no
Checking for libvpx... no
Checking for libwebp, libwebpmux and libwebpdemux... yes
Checking for libxml2 and libxslt... yes
Checking for libxml2 configured with icuuc... yes
Checking for minizip... yes
Checking for system ninja... yes
Checking for nss... yes
Checking for opus... yes
Checking for libpng >= 1.6.0... yes
Checking for protobuf... yes
Checking for protoc... no
Checking for re2... no
Checking for snappy... no
Checking for xcomposite... no
Checking for xcursor... no
Checking for xi... no
Checking for xrandr... no
Checking for xtst... no
Checking for zlib... yes
Checking for host compiler... no
Done running configuration tests.

Configure summary:

Qt WebEngine:
  Embedded build ......................... yes
  Pepper Plugins ......................... no
  Printing and PDF ....................... no
  Proprietary Codecs ..................... no
  Spellchecker ........................... yes
  Native Spellchecker .................... no
  WebRTC ................................. no
  Use System Ninja ....................... yes
  Geolocation ............................ yes
  Use v8 snapshot ........................ yes
  Use ALSA ............................... yes
  Use PulseAudio ......................... yes
  Optional system libraries used:
    re2 .................................. no
    icu .................................. no
    libwebp, libwebpmux and libwebpdemux . yes
    opus ................................. yes
    ffmpeg ............................... no
    libvpx ............................... no
    snappy ............................... no
    libsrtp .............................. no
    glib ................................. yes
    zlib ................................. yes
    minizip .............................. yes
    libevent ............................. yes
    jsoncpp .............................. yes
    protobuf ............................. no
    libxml2 and libxslt .................. yes
    lcms2 ................................ no
    png .................................. yes
    harfbuzz ............................. yes
  Required system libraries:
    fontconfig ........................... yes
    dbus ................................. yes
    nss .................................. yes
    khr .................................. yes
    glibc ................................ yes
  Required system libraries for qpa-xcb:
    libdrm ............................... yes
    xcomposite ........................... no
    xcursor .............................. no
    xi ................................... no
    xrandr ............................... no
    xtst ................................. no

Note: Dropped compiler flags '-pthread' when detecting library 'webengine-protobuf'.

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/opt/qt5pi/sysroot/usr/local/qt5pi'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

 
V8 snapshot cannot be built. Most likely, the 32-bit host compiler does not work. Please make sure you have 32-bit devel environment installed, or  configure webengine with '-no-webengine-v8-snapshot'
QtWebEngine will not be built.

[SGaist]

Hi,

@SherifOmran said in compiling qt webengine fail:

xcomposite ........................... no
xcursor .............................. no
xi ................................... no
xrandr ............................... no
xtst ................................. no

You are still missing the corresponding development packages as it seems.

[raven-worx]

@SherifOmran
your configuration seems good so far. What backend you plan to use? For X11 you have to install the packages (armhf @SGaist mentioned

 Required system libraries for qpa-xcb:
    libdrm ............................... yes
    xcomposite ........................... no
    xcursor .............................. no
    xi ................................... no
    xrandr ............................... no
    xtst ................................. no

I had the problem (also especially with Qt 5.10.1) that i only was able to cross compile QtWebEngine with the -no-webengine-v8-snapshot option. There is also a bugreport regarding this IIRC.

Also your first post shows that you tried to build Qt statically?