Cross compile the Qt5.9.2 to Cortex-A8

[RunThiner]

hi, my desktop is Ubnutu 16.04 x64, and my target is ti AM3358, a cortex-A8 platform.
my compiler is arm-linux-gnueabihf, ver 6.2.1 20161016 (Linaro GCC 6.2-2016-11),
i am configure the qt5.9.2 as below:
./configure -v
-debug
-opensource
-confirm-license
-make libs
-optimized-qmake
-c++std c++11
-strip
-platform linux-g++
-xplatform linux-arm-gnueabi-g++
-prefix /home/jerry/Qt592am3358
-qt-libjpeg
-qt-libpng
-qt-zlib
-qt-sqlite
-tslib
-qreal float
-alsa
-openssl
-icu
-linuxfb
-pch
-no-opengl
-no-egl
-no-eglfs
-no-evdev
-no-directfb
-no-sql-db2
-no-sql-ibase
-no-sql-oci
-no-sql-mysql
-no-sql-odbc
-no-sql-psql
-no-sql-sqlite2
-no-sql-tds
-no-xcb
-no-xcb-xlib
-no-cups
-no-iconv
-no-glib
-no-android-style-assets
-nomake examples
-nomake tests

the result as below:
Configure summary:

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: linux-arm-gnueabi-g++ (arm, CPU features: <none>)
Configuration: cross_compile use_gold_linker compile_examples enable_new_dtags largefile optimize_debug precompile_header shared rpath debug c++11 concurrent dbus no-pkg-config reduce_exports release_tools stl
Build options:
Mode ................................... debug; optimized tools
Optimize debug build ................... yes
Building shared libraries .............. yes
Using C++ standard ..................... C++11
Using ccache ........................... no
Using gold linker ...................... yes
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 ....................... no
QML debugging .......................... yes
udev ................................... no
Using system zlib ...................... no
Qt Core:
DoubleConversion ....................... yes
Using system DoubleConversion ........ no
GLib ................................... no
iconv .................................. no
ICU .................................... yes
Logging backends:
journald ............................. no
syslog ............................... no
slog2 ................................ no
Using system PCRE2 ..................... no
Qt Network:
getaddrinfo() .......................... yes
getifaddrs() ........................... yes
IPv6 ifname ............................ yes
libproxy ............................... no
OpenSSL ................................ yes
Qt directly linked to OpenSSL ........ no
SCTP ................................... no
Use system proxies ..................... yes
Qt Gui:
Accessibility .......................... yes
FreeType ............................... yes
Using system FreeType ................ no
HarfBuzz ............................... yes
Using system HarfBuzz ................ no
Fontconfig ............................. no
Image formats:
GIF .................................. yes
ICO .................................. yes
JPEG ................................. yes
Using system libjpeg ............... no
PNG .................................. yes
Using system libpng ................ no
EGL .................................... no
OpenVG ................................. no
OpenGL:
Desktop OpenGL ....................... no
OpenGL ES 2.0 ........................ no
OpenGL ES 3.0 ........................ no
OpenGL ES 3.1 ........................ no
Session Management ..................... yes
Features used by QPA backends:
evdev .................................. no
libinput ............................... no
INTEGRITY HID .......................... no
mtdev .................................. no
tslib .................................. yes
xkbcommon-evdev ........................ no
QPA backends:
DirectFB ............................... no
EGLFS .................................. 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
Qt SerialBus:
Socket CAN ............................. yes
Socket CAN FD .......................... yes
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 3D:
Assimp ................................. yes
System Assimp .......................... no
Output Qt3D Job traces ................. no
Output Qt3D GL traces .................. no
Qt 3D GeometryLoaders:
Autodesk FBX ........................... no
Qt Wayland Client ........................ no
Qt Wayland Compositor .................... no
Qt Bluetooth:
BlueZ .................................. no
BlueZ Low Energy ....................... no
Linux Crypto API ....................... no
Qt Sensors:
sensorfw ............................... no
Qt Quick Controls 2:
Styles ................................. Default Material Universal
Qt Quick Templates 2:
Hover support .......................... yes
Multi-touch support .................... yes
Qt Positioning:
Gypsy GPS Daemon ....................... no
WinRT Geolocation API .................. no
Qt Location:
Geoservice plugins:
OpenStreetMap ........................ yes
HERE ................................. yes
Esri ................................. yes
Mapbox ............................... yes
MapboxGL ............................. no
Itemsoverlay ......................... yes
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 WebEngine:
Embedded build ......................... yes
Pepper Plugins ......................... no
Printing and PDF ....................... no
Proprietary Codecs ..................... no
Spellchecker ........................... yes
WebRTC ................................. no
Using system ninja ..................... no
ALSA ................................... yes
PulseAudio ............................. no
System libraries:
re2 .................................. no
ICU .................................. no
libwebp and libwebpdemux ............. no
Opus ................................. no
ffmpeg ............................... no

Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.

WARNING: Feature xcb-xlib is insignificant in this configuration, ignoring related command line option(s).

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/home/jerry/Qt592am3358'.

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

i do compile at first time, many warning like as below:
In file included from ../../include/QtCore/qdebug.h:1:0,
from tools/qcommandlineparser.cpp:46:
../../include/QtCore/../../src/corelib/io/qdebug.h: In member function 'void QDebug::Stream::setVerbosity(int)':
../../include/QtCore/../../src/corelib/io/qdebug.h:99:42: warning: result of '(7 << 29)' requires 33 bits to represent, but 'int' only has 32 bits [-Wshift-overflow=]
flags &= ~(VerbosityMask << VerbosityShift);
^~~

and i do compile at second time, many error like as below:
cc1plus: error: one or more PCH files were found, but they were invalid
cc1plus: error: use -Winvalid-pch for more information
cc1plus: fatal error: .pch/Qt5Bluetooth: No such file or directory
compilation terminated.

i am make a qtdemo app, it is a dialog only, it run on ubuntu well, cross compile it to my AN3358 board, it is run with "segment fault" as below:
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt592/plugins/platforms/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/demo/accessiblebridge" ...
Segmentation fault

have any body meet this problem, how to solve this problem.
thanks very much

[SGaist]

Hi and welcome to devnet,

Something's not clear, why do you need to build several times ?

What did you do between these two builds ?

[RunThiner]

hi, thank you for your reply, SGaist.
the first time is 'make ARCH=arm -j4', it is a multi-thread compile, i think may be some error information are not display on my screen.
so the second time is 'make ARCH=arm', just check the compile output information on the screen.
today, this problem was solved, i did deleted the '-qreal float', the qt5.9.2 compile successfully for AM3358.

but now the big problem as below:
1, the Qt Console Application running well on my AM3358 board.
2, the Qt Widgets Application running fault on my AM3358 board, the information as below:
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt592/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/qt592/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /opt/qt592/plugins/platforms/libqlinuxfb.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"linuxfb"
]
},
"className": "QLinuxFbIntegrationPlugin",
"debug": false,
"version": 329986
}

Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/opt/qt592/plugins/platforms/libqminimal.so"
Found metadata in lib /opt/qt592/plugins/platforms/libqminimal.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"minimal"
]
},
"className": "QMinimalIntegrationPlugin",
"debug": false,
"version": 329986
}

Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/opt/qt592/plugins/platforms/libqoffscreen.so"
Found metadata in lib /opt/qt592/plugins/platforms/libqoffscreen.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"offscreen"
]
},
"className": "QOffscreenIntegrationPlugin",
"debug": false,
"version": 329986
}

Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/opt/qt592/plugins/platforms/libqvnc.so"
Found metadata in lib /opt/qt592/plugins/platforms/libqvnc.so, metadata=
{
"IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
"MetaData": {
"Keys": [
"vnc"
]
},
"className": "QVncIntegrationPlugin",
"debug": false,
"version": 329986
}

Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/demo" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/bk.sh"
QElfParser: '/usr/demo/bk.sh' is not an ELF object
"'/usr/demo/bk.sh' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/getipbyname"
"Failed to extract plugin meta data from '/usr/demo/getipbyname'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/getweather"
"Failed to extract plugin meta data from '/usr/demo/getweather'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/kotest"
"Failed to extract plugin meta data from '/usr/demo/kotest'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/lcd"
"Failed to extract plugin meta data from '/usr/demo/lcd'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/led.sh"
QElfParser: '/usr/demo/led.sh' is not an ELF object
"'/usr/demo/led.sh' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/lsusb"
"Failed to extract plugin meta data from '/usr/demo/lsusb'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/qcmd"
"Failed to extract plugin meta data from '/usr/demo/qcmd'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/socket"
"Failed to extract plugin meta data from '/usr/demo/socket'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/usr/demo/tty"
"Failed to extract plugin meta data from '/usr/demo/tty'"
not a plugin
loaded library "/opt/qt592/plugins/platforms/libqlinuxfb.so"
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt592/plugins/platforms/../platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/qt592/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so"
Found metadata in lib /opt/qt592/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so, metadata=
{
"IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
"MetaData": {
"Keys": [
"ibus"
]
},
"className": "QIbusPlatformInputContextPlugin",
"debug": false,
"version": 329986
}

Got keys from plugin meta data ("ibus")
QFactoryLoader::QFactoryLoader() looking at "/opt/qt592/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so"
Found metadata in lib /opt/qt592/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so, metadata=
{
"IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
"MetaData": {
"Keys": [
"qtvirtualkeyboard"
]
},
"className": "QVirtualKeyboardPlugin",
"debug": false,
"version": 329986
}

Got keys from plugin meta data ("qtvirtualkeyboard")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/demo/../platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt592/plugins/platforms/../generic" ...
QFactoryLoader::QFactoryLoader() looking at "/opt/qt592/plugins/generic/libqtslibplugin.so"
Found metadata in lib /opt/qt592/plugins/generic/libqtslibplugin.so, metadata=
{
"IID": "org.qt-project.Qt.QGenericPluginFactoryInterface",
"MetaData": {
"Keys": [
"Tslib",
"TslibRaw"
]
},
"className": "QTsLibPlugin",
"debug": false,
"version": 329986
}

Got keys from plugin meta data ("tslib", "tslibraw")
QFactoryLoader::QFactoryLoader() looking at "/opt/qt592/plugins/generic/libqtuiotouchplugin.so"
Found metadata in lib /opt/qt592/plugins/generic/libqtuiotouchplugin.so, metadata=
{
"IID": "org.qt-project.Qt.QGenericPluginFactoryInterface",
"MetaData": {
"Keys": [
"TuioTouch"
]
},
"className": "QTuioTouchPlugin",
"debug": false,
"version": 329986
}

Got keys from plugin meta data ("tuiotouch")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/demo/../generic" ...
loaded library "/opt/qt592/plugins/generic/libqtslibplugin.so"
QFactoryLoader::QFactoryLoader() checking directory path "/opt/qt592/plugins/platforms/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/demo/styles" ...
Segmentation fault

[jimfar]

maybe u need change ur croos compiler ，i complie ok on IMX6 platform with arm-none-linux-gnueabi-linux-4.8.1

[jimfar]

PS :ubuntu12.04 and qt5.9.2

[RunThiner]

problem were solved.
just set the QT_QPA_FB_HIDECURSOR=0.

if set the QT_QPA_FB_HIDECURSOR=1, a NULL point will occur in qtbase/src/gui/kernel/qplatformcursor.cpp:
void QPlatformCursorImage::set(Qt::CursorShape id)
{
QPlatformCursorImage *cursor = 0;

if (id >= 0 && id <= Qt::LastCursor) {
    if (!systemCursorTable[id]){
        createSystemCursor(id);
	}
    cursor = systemCursorTable[id];
}
if (cursor == 0) {
    if (!systemCursorTable[Qt::ArrowCursor]){
        createSystemCursor(Qt::ArrowCursor);
	}
    cursor = systemCursorTable[Qt::ArrowCursor];
}
   //will be NULL point as below if QT_QPA_FB_HIDECURSOR=1
cursorImage = cursor->cursorImage;   
hot = cursor->hot;

}

[SGaist]

That looks like a bug. You should check the bug report system to see if it's something known.