[SOLVED] Qt on Slackware Linux

Sleicreider · wrote on 13 Mar 2014, 15:30

hi,

Standard Pre-Installed Qt4.8. is working with the Qt Creator 2.8.0, which I got from http://slackbuilds.org/repository/14.1/development/qt-creator/

Somehow, when removed the old Qt4.8 and try to get this QtCreator working with the new Qt5.2.1
http://slackbuilds.org/repository/14.1/libraries/qt5/
it says no qmake found.

I only can find a qmake-qt5 but no qmake.
It's possible ,that Qt5.2.1 only provides the qmake-qt5, but how is it possible to get this working with my QtCreator?

andreyc · wrote on 13 Mar 2014, 16:45

qmake-qt5 is a regular qmake that was renamed by a package maintainer to avoid collisions with qt4.

I would suggest you to use Qt from "qt-project downloads":http://qt-project.org/downloads
In this case you will get Qtcreator and Qt framework.
The installer will put everything under one directory which you can change during installation. By default it is $HOME/Qt5.2.1

If you prefer to keep the Qt5 package and removed qt4 then rename qmake-qt5 to qmake

Sleicreider · wrote on 14 Mar 2014, 08:38

using the qt-installer and it's .run file, solved my problem :) thank you

compiler is doing fine, but it shows a few errors:

libGL error: failed to load driver: i965
libGL error: Try again with LIBGL_DEBUG=verbose for more details.

any solution for this ?

Sleicreider · wrote on 14 Mar 2014, 08:47

btw: the error only appears with a QT GUI project
console application works fine

andreyc · wrote on 14 Mar 2014, 15:58

Qt tries to use opengl and looks like your video setup does not have it.
Check what LIBGL_DEBUG tells.
Maybe you will need to update video drivers and or install mesa libraries.
I have not seen this problem on my linux boxes (fedora and ubuntu) so I can not tell much here.

Sleicreider · wrote on 14 Mar 2014, 16:22

oh, i'm working on a hp workstation here, could be the reason for this error, because it has no graphic card(just intel xeon integraded graphics) which normally provides opengl.

andreyc · wrote on 14 Mar 2014, 16:57

It can be the reason.

Do you use opengl in your application? If so, then you may need to install mesa libraries and use software opengl.
What messages LIBGL_DEBUG=verbose gives ?
Does qtcreator from downloaded Qt gives the same error?
If you try to build Qt examples do they provide the same error?

Sleicreider · wrote on 14 Mar 2014, 18:12

Actually i don't need OpenGL on this pc,
the error message just appears(application output) in a GUI(mainwindow etc.) project when I compile it, but the application itself works fine.

the console application works perfectly.

andreyc · wrote on 15 Mar 2014, 18:00

Just out of curiosity. If you will set LIBGL_DEBUG=verbose before a compilation then maybe you will see who is the reason for the message.
something like this
@
export LIBGL_DEBUG=verbose
qmake
make
@

Sleicreider · wrote on 17 Mar 2014, 08:47

sry for the question, but where you want me to write this down?

andreyc · wrote on 17 Mar 2014, 14:29

Run these commands in a shell command prompt.

Run it in separate directory from your project directory.
For example if your .pro file is located in
/home/user/workspace/myproject
then
@
cd /home/user/workspace/
mkdir build-myproject
cd build-myproject
export LIBGL_DEBUG=verbose
qmake -recursive ../myproj
make
@

Sleicreider · wrote on 17 Mar 2014, 14:35

it says: bash: qmake-recursive: command not found

andreyc · wrote on 17 Mar 2014, 15:35

There is a space between qmake and -recursive

Sleicreider · wrote on 17 Mar 2014, 16:12

it says: qmake command not found,
also can't find a qmake or qmake-qt5 with

which qmake

or

which qmake-qt5

btw: i used the online installer straight from the qt website(.run)

andreyc · wrote on 17 Mar 2014, 16:18

The try to run qmake with full path.
Let say you have Qt installed in /home/user/Qt5.2.1
then run it
@
/home/user/Qt5.2.1/5.2.1/gcc/bin/qmake
@

Sleicreider · wrote on 18 Mar 2014, 08:01

thats the output in the terminal:
@
bash-4.2$ make
/home/reidom1994/Qt/5.2.1/gcc_64/bin/uic ../GUI_Hello_World/mainwindow.ui -o ui_mainwindow.h
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIE -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../Qt/5.2.1/gcc_64/mkspecs/linux-g++ -I../GUI_Hello_World -I../../Qt/5.2.1/gcc_64/include -I../../Qt/5.2.1/gcc_64/include/QtWidgets -I../../Qt/5.2.1/gcc_64/include/QtGui -I../../Qt/5.2.1/gcc_64/include/QtCore -I. -I. -I. -o main.o ../GUI_Hello_World/main.cpp
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIE -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../Qt/5.2.1/gcc_64/mkspecs/linux-g++ -I../GUI_Hello_World -I../../Qt/5.2.1/gcc_64/include -I../../Qt/5.2.1/gcc_64/include/QtWidgets -I../../Qt/5.2.1/gcc_64/include/QtGui -I../../Qt/5.2.1/gcc_64/include/QtCore -I. -I. -I. -o mainwindow.o ../GUI_Hello_World/mainwindow.cpp
/home/reidom1994/Qt/5.2.1/gcc_64/bin/moc -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../Qt/5.2.1/gcc_64/mkspecs/linux-g++ -I../GUI_Hello_World -I../../Qt/5.2.1/gcc_64/include -I../../Qt/5.2.1/gcc_64/include/QtWidgets -I../../Qt/5.2.1/gcc_64/include/QtGui -I../../Qt/5.2.1/gcc_64/include/QtCore -I. -I. -I. ../GUI_Hello_World/mainwindow.h -o moc_mainwindow.cpp
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIE -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../Qt/5.2.1/gcc_64/mkspecs/linux-g++ -I../GUI_Hello_World -I../../Qt/5.2.1/gcc_64/include -I../../Qt/5.2.1/gcc_64/include/QtWidgets -I../../Qt/5.2.1/gcc_64/include/QtGui -I../../Qt/5.2.1/gcc_64/include/QtCore -I. -I. -I. -o moc_mainwindow.o moc_mainwindow.cpp
g++ -Wl,-O1 -Wl,-rpath,/home/reidom1994/Qt/5.2.1/gcc_64 -Wl,-rpath,/home/reidom1994/Qt/5.2.1/gcc_64/lib -o GUI_Hello_World main.o mainwindow.o moc_mainwindow.o -L/home/reidom1994/Qt/5.2.1/gcc_64/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread @

andreyc · wrote on 18 Mar 2014, 14:25

I don't see any error message in the output.
Does it mean that issue is gone ?
Does your app works without any error messages ?

Sleicreider · wrote on 19 Mar 2014, 07:47

It still appears in the application output :
Starting /home/user/QT C++/myproject/myproject...
libGL error: failed to load driver: i965
libGL error: Try again with LIBGL_DEBUG=verbose for more details.

Application still works fine.

I have no idea, but it's working so doesn't matter i think xD

andreyc · wrote on 19 Mar 2014, 17:40

What if you will run your app with LIBGL_DEBUG=verbose
something like
@
export LIBGL_DEBUG=verbose
/home/user/QT C++/myproject/myproject…
@

If it does not bother you then you can run your app and redirect all output to /dev/null
@
/home/user/QT C++/myproject/myproject… > /dev/null 2>&1
@

Sleicreider · wrote on 20 Mar 2014, 07:58

first one without root:

libGL: OpenDriver: trying /usr/lib64/xorg/modules/dri/i965_dri.so
libGL error: failed to open drm device: Permission denied
libGL error: failed to load driver: i965
libGL: OpenDriver: trying /usr/lib64/xorg/modules/dri/swrast_dri.so

with root:
Qt: Session management error: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
libGL: OpenDriver: trying /usr/lib64/xorg/modules/dri/i965_dri.so
libGL: Can't open configuration file /root/.drirc: No such file or directory.

I also tried the second one.
Whats the reason, to redirect the output to /dev/null ^^