Qt5 development primer

arichardson · wrote on 10 Oct 2011, 11:11

I did a new clean build and for some reason it worked now. Thank you for your help.

jmfairlie · wrote on 13 Oct 2011, 08:25

On mac 10.6.8, I have problems building this. The linker complains about an nonexistent "OpenGl" library. After replacing with "OpenGL" (notice capital L) in the offending files* this issue resolves.
Unfortunately QtQuick2.0 examples don't work. For some reason importing folders from QML files is not working as it should. qmlscene doesnt recognize the imported folders (despite the fact that they are there at the same level as the invoking qml file). I keep getting:

.../somefile.qml: "SomeFolder": No such directory

(*) among them:
./qtbase/src/platformsupport/cglconvenience/cglconvenience.pri: LIBS += -framework Cocoa -framework OpenGl

kkoehne · wrote on 13 Oct 2011, 08:39

@jmfairlie: I'm not working on Mac OS X, sorry. You should raise your problems (after verifying that the problem is still there in latest master branch of e.g. qtbase) on IRC/freenode, #qt-labs channel . Or you raise it on qt5-feedback@qt.nokia.com .

jmfairlie · wrote on 14 Oct 2011, 05:17

Now I tried with Ubuntu 11.04 with an ATI gpu (might be relevant) and linker isn't able to find GL libraries. Indeed, for some reason, there is no /usr/lib/libGL.so in my machine (not sure if this is normal) but only in /usr/lib/mesa and /usr/lib/fglrx.

If I add "-opengl desktop" to configure then it shows the message:

The OpenGL functionality test failed!
You might need to modify the include and library search paths by editing
QMAKE_INCDIR_OPENGL, QMAKE_LIBDIR_OPENGL and QMAKE_LIBS_OPENGL in
.../qt5/qtbase/mkspecs/linux-g++.

If I follow the suggestion and add those lines to qtbase/mkspecs/linux-g++/qmake.conf :

QMAKE_LIBDIR_OPENGL = /usr/lib/fglrx
QMAKE_INCDIR_OPENGL = /usr/include/GL
QMAKE_LIBS_OPENGL = -lGL

It doesn't make a difference and linker is still unable to find the GL libraries, (I guess those macros are not being used)

However if I just add a symlink to any of the GL libs to /usr/lib it finally finds them.

Unfortunately, QtQuick2.0 examples (what I'm interested in) don't work either, this time qmlscene SEGFAULTS in a seemingly unrelated call ... I guess I'll need to wait until a more stable version comes out.

kkoehne · wrote on 15 Oct 2011, 07:28

Ubuntu 11.04 is used heavily in the development teams, so this should really work out of the box, without any environment variable tinkering. The libgl1-mesa-dev should include the /usr/lib/libGL.so file, try installing this package. (Btw, you can find out which package provides which file by using the "apt-get file search" command).

For reference, this is the output "configure -nokia-developer -nomake examples -nomake demos -nomake tests" gives me on an Ubuntu 11.04:

@
Build type: linux-g++
Architecture: i386
Host architecture: i386
Platform notes:

        - Also available for Linux: linux-kcc linux-icc linux-cxx

Build .................. libs
Configuration .......... debug shared dll qpa largefile stl precompile_header mmx 3dnow sse sse2 sse3 ssse3 sse4_1 sse4_2 avx minimal-config small-config medium-config large-config full-config fontconfig xlib xcb-xlib phonon-backend accessibility opengl qpa reduce_exports clock-gettime clock-monotonic mremap getaddrinfo ipv6ifname getifaddrs inotify system-jpeg system-mng system-png png system-tiff system-freetype system-zlib nis cups glib gstreamer dbus openssl xcb alsa pulseaudio concurrent audio-backend svg v8 debug private_tests
Debug .................. yes
Qt 3 compatibility ..... no
QtDBus module .......... yes (run-time)
QtConcurrent code ...... yes
QtGui module ........... yes
QtScript module ........ yes
QtScriptTools module ... yes
QtXmlPatterns module ... yes
Phonon module .......... yes
Multimedia module ...... auto
SVG module ............. yes
WebKit module .......... yes
JavaScriptCore JIT ..... To be decided by JavaScriptCore
V8 module .............. yes
Declarative module ..... yes
Declarative debugging ...yes
Location module ........ no
Support for S60 ........ no
Symbian DEF files ...... no
STL support ............ yes
PCH support ............ yes
MMX/3DNOW/SSE/SSE2/SSE3. yes/yes/yes/yes/yes
SSSE3/SSE4.1/SSE4.2..... yes/yes/yes
AVX..................... yes
IPv6 ifname support .... yes
getaddrinfo support .... yes
getifaddrs support ..... yes
Accessibility .......... yes
NIS support ............ yes
CUPS support ........... yes
Iconv support .......... no
Glib support ........... yes
GStreamer support ...... yes
PulseAudio support ..... yes
Large File support ..... yes
GIF support ............ plugin
TIFF support ........... plugin (system)
JPEG support ........... plugin (system)
PNG support ............ yes (system)
MNG support ............ plugin (system)
zlib support ........... system
Session management ..... auto
OpenGL support ......... yes (Desktop OpenGL)
OpenVG support ......... no
MySQL support .......... plugin
SQLite support ......... plugin (qt)
OpenSSL support ........ yes (run-time)
Alsa support ........... yes
ICD support ............ no
libICU support ......... no
Xcb support ............ limited (old version)
@

jmfairlie · wrote on 15 Oct 2011, 09:02

this is what I got, I'll check on Monday if getting rid of the differences makes any difference:
@
--- a/jean
+++ b/kkoehne
-QtDBus module .......... no
+QtDBus module .......... yes (run-time)
-Phonon module .......... no
+Phonon module .......... yes
-CUPS support ........... no
+CUPS support ........... yes
-GStreamer support ...... no
-PulseAudio support ..... no
+GStreamer support ...... yes
+PulseAudio support ..... yes
-MNG support ............ plugin (qt)
+MNG support ............ plugin (system)
+MySQL support .......... plugin
-OpenSSL support ........ no
-Alsa support ........... no
+OpenSSL support ........ yes (run-time)
+Alsa support ........... yes
@

jmfairlie · wrote on 20 Oct 2011, 16:00

pulled current latest version:

commit 0a0d66efceb64bcacffbf733053834829c657df7
Date: Wed Oct 19 07:38:37 2011 +1000

and this time qmlscene spit some more info after segfault:

"Cannot create platform GL context, none of GLX, EGL, DRI2 is enabled"

This message directed me to:
http://comments.gmane.org/gmane.comp.lib.qt.qml/3060

which suggests to install libx11-xcb-dev. Indeed I didn't have it, so I installed, cleaned and rebuilt, and now it works.

If this package is required for qtdeclarative to work properly shouldn't configure notice it and mention it somehow?
Anyhow, Just added this info to the wiki page.

qtd1d1 · wrote on 22 Nov 2011, 10:02

The installation was successful, but when I try to compile my own application I get the following error:
QDeclarativeView: No such file or directory

Just read the windows needs python for QDeclarative. What packages do I need for Linux (Ubuntu 10.04) ?

Does anyone had similar problems?

andreagrandi · wrote on 23 Nov 2011, 13:37

After compiling Qt5 I'd like to do a safe "make install" in my system. With "safe" I mean that I don't want to overwtite my Qt4 libs on my system so they should be installed in (for example) /opt/qt5 if it's possible.

I also would like to start packaging Qt5 in a Ubuntu PPA, but even if I've a little experience with packaging, I really don't know how to split an installation in multiple packages (I mean: qt-multimedia, qt-database, qt-tools ecc.... just to make you an example): should I take example from the actual Qt4 packages available in Ubuntu? Anyone want to help me? Thanks!

qtd1d1 · wrote on 24 Nov 2011, 10:07

How do you force qtbase/src/plugins/platforms/xcb to recompile?

markc · wrote on 29 Dec 2011, 06:45

I get this at every dir level I tried on Archlinux x86_64...
@~qt5-git/qtbase git submodule update --init src/3rdparty/v8
You need to run this command from the toplevel of the working tree.@
I already have a libv8 3.6.5.1 as part of my system so would it possible for qtbase and whatever else needs libv8 to just link against my system version?

ludde · wrote on 3 Jan 2012, 07:57

Hi! Trying to build Qt 5 for the first time, but I'm not getting very far...
Seems like the init-repository script is not working properly with the the --http option. All the repos are cloned using "http:", except for the qt3d repo which still tries to use "git:".
Very simple problem, but with my total lack of experience with perl, I'm not sure how to work around it... If anyone could give me a hint on how to get past this, by fixing init-repository, or doing some manual step, it would be most appreciated.

markc · wrote on 3 Jan 2012, 09:53

What is the best way to incorporate qtwebkit into a qt5 build?
@...
[pid 30835] open(".../qt5-git/.git/modules/qtwebkit/refs/heads/master", O_RDONLY) = -1 ENOENT (No such file or directory)
[pid 30835] write(2, "fatal: Oops\n", 12fatal: Oops@

@ludde, I'm not sure why there is not some plain English instructions to clone the repo exactly, or a bash script, rather than buried inside an obfuscated perl script that doesn't seem to work. An example .git/config file would be more useful.

ludde · wrote on 4 Jan 2012, 12:41

Managed to make init-repository clone all the modules (by fiddling a bit with the perl script, without really understanding what I was doing...).

Also managed to run configure. But compiling (using Microsoft Visual Studio 2005, on Windows 7, 64 bit) eventually fails:

@
c:\users\ludde\qt\qt5\qtbase\src\plugins\platforms\windows\qtwindowsglobal.h(178) : error C2065: 'WM_XBUTTONDOWN' : undeclared identifier
c:\users\ludde\qt\qt5\qtbase\src\plugins\platforms\windows\qtwindowsglobal.h(178) : error C2065: 'WM_XBUTTONDBLCLK' : undeclared identifier
c:\users\ludde\qt\qt5\qtbase\src\plugins\platforms\windows\qwindowscontext.h(74) : error C2059: syntax error : '<L_TYPE_raw>'
@

Any ideas on what might be causing this?

kkoehne · wrote on 11 Jan 2012, 08:45

@ludde: I filed https://bugreports.qt.nokia.com/browse/QTBUG-23580 regarding your problems with the -http option. About the windows problems ... don't know, it compiles for me :( I guess you're better off subscribing to qt-development@qt-project.org, and posting your problems there.

oneWonders · wrote on 21 Jan 2012, 14:40

While running
@./configure -developer-build -opensource -nomake examples -nomake tests@

i get this error partway through:

@Creating qmake. Please wait...
g++ -c -o project.o -pipe -DQMAKE_OPENSOURCE_EDITION -g -g -I. -Igenerators -Igenerators/unix -Igenerators/win32 -Igenerators/mac -Igenerators/integrity -I/home/daniel/qt5/qtbase/include -I/home/daniel/qt5/qtbase/include/QtCore -I/home/daniel/qt5/qtbase/include/QtCore/5.0.0 -I/home/daniel/qt5/qtbase/include/QtCore/5.0.0/QtCore -I/home/daniel/qt5/qtbase/src/corelib/global -I/home/daniel/qt5/qtbase/src/corelib/xml -I/home/daniel/qt5/qtbase/tools/shared -DQT_NO_PCRE -DQT_BUILD_QMAKE -DQT_BOOTSTRAPPED -DQT_NO_TEXTCODEC -DQT_NO_UNICODETABLES -DQT_NO_COMPONENT -DQT_NO_STL -DQT_NO_COMPRESS -I/home/daniel/qt5/qtbase/mkspecs/linux-g++ -DHAVE_QCONFIG_CPP -DQT_NO_THREAD -DQT_NO_QOBJECT -DQT_NO_GEOM_VARIANT -DQT_NO_DEPRECATED project.cpp
make: g++: Command not found
make: *** [project.o] Error 127
@

I am using ubuntu, does anyone know where i went wrong?
Sorry i'm rather new to all this :$

dangelog · wrote on 21 Jan 2012, 15:01

Do you have gcc installed...?

ludde · wrote on 21 Jan 2012, 16:53

Had this problem too. For some reason you need not only have gcc installed, but have it available as g++. This can be accomplished by installing the g++ package (and possibly also by just creating an alias from g++ to gcc, but I didn't try this).

oneWonders · wrote on 23 Jan 2012, 00:42

Ah thanks, that works, i had gcc installed but not g++ it seems.

Strangely, i cannot run demos as even if i make the executables runnable, then i get something like this:
@Details: Failed to execute child process "/usr/bin/tea_service" (No such file or directory)@

after making the qt teaservice.desktop demo executable as a program in its right click properties and trying to run.
Somehow i get the impression that this is not what i am meant to be doimng anyway, as the idea that i would have to right click and change the permissions of all the demo files that i wanted to run doesn't seem the most fun so i guess i am trying to do it the wrong way :$

Also, i tried to compile qt creator and the qtquick3d demos myself and got errors.
(For example, for the qtquick3d):
@daniel@andy-desktop:~/qt_creator/what$ qmake /home/daniel/qt5/qtquick3d/demos/demos.pro
daniel@andy-desktop:~/qt_creator/what$ sudo make
cd quick3d/ && /home/daniel/qt5/qtbase/bin/qmake /home/daniel/qt5/qtquick3d/demos/quick3d/quick3d.pro -o Makefile
cd quick3d/ && make -f Makefile
make[1]: Entering directory /home/daniel/qt_creator/what/quick3d' cd model_viewer/ && /home/daniel/qt5/qtbase/bin/qmake /home/daniel/qt5/qtquick3d/demos/quick3d/model_viewer/model_viewer.pro -o Makefile cd model_viewer/ && make -f Makefile make[2]: Entering directory /home/daniel/qt_creator/what/quick3d/model_viewer'
g++ -c -pipe -g -Wall -W -D_REENTRANT -DQT_DECLARATIVE_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I../../../../qt5/qtbase/mkspecs/linux-g++ -I../../../../qt5/qtquick3d/demos/quick3d/model_viewer -I../../../../qt5/qtbase/include/QtCore -I../../../../qt5/qtbase/include/QtGui -I../../../../qt5/qtbase/include/QtWidgets -I../../../../qt5/qtdeclarative/include -I../../../../qt5/qtdeclarative/include/QtDeclarative -I../../../../qt5/qtbase/include -I../../../../qt5/qtbase/include/QtNetwork -I../../../../qt5/qtxmlpatterns/include -I../../../../qt5/qtxmlpatterns/include/QtXmlPatterns -I/usr/X11R6/include -I. -I../../../../qt5/qtquick3d/demos/quick3d/model_viewer -I. -o main.o ../../../../qt5/qtquick3d/demos/quick3d/model_viewer/main.cpp
In file included from ../../../../qt5/qtbase/include/QtGui/qopengl.h:1:0,
from ../../../../qt5/qtdeclarative/include/QtDeclarative/../../src/declarative/items/qquickcanvas.h:46,
from ../../../../qt5/qtdeclarative/include/QtDeclarative/qquickcanvas.h:1,
from ../../../../qt5/qtdeclarative/include/QtDeclarative/../../src/declarative/items/qquickview.h:46,
from ../../../../qt5/qtdeclarative/include/QtDeclarative/qquickview.h:1,
from ../../../../qt5/qtdeclarative/include/QtDeclarative/QQuickView:1,
from ../../../../qt5/qtquick3d/demos/quick3d/model_viewer/../qmlres.h:47,
from ../../../../qt5/qtquick3d/demos/quick3d/model_viewer/main.cpp:42:
../../../../qt5/qtbase/include/QtGui/../../src/gui/opengl/qopengl.h:69:21: fatal error: GL/gl.h: No such file or directory
compilation terminated.
make[2]: *** [main.o] Error 1
make[2]: Leaving directory /home/daniel/qt_creator/what/quick3d/model_viewer' make[1]: *** [sub-model_viewer-make_default] Error 2 make[1]: Leaving directory /home/daniel/qt_creator/what/quick3d'
make: *** [sub-quick3d-make_default] Error 2
@

Sorry to be a pain.

bunjee · wrote on 24 Jan 2012, 22:29

Greetings guys,

On Windows 7 x64 I get the following:

@qwindowstheme.cpp: In member function 'virtual QVariant QWindowsTheme::themeHint(QPlatformTheme::ThemeHint) const': qwindowstheme.cpp:77:53: error: 'SPI_GETDROPSHADOW' was not declared in this scope@

It seems that the SPI_GETDROPSHADOW is under a WIN_NT_32 define.