[SOLVED] Qt on Slackware Linux

Sleicreider

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

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

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

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

andreyc

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

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

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

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

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

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

andreyc

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

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

andreyc

There is a space between qmake and -recursive

Sleicreider

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

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

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

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

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

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

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 ^^