Qt on CentOS 7 not working

Dino

Dear all,
I have installed Qt Creator on a CentOS 7 machine but whenever I try to build a program, even the examples one I get the following errors:

:-1: error: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../libGL.so when searching for -lGL

:-1: error: skipping incompatible /lib/libGL.so when searching for -lGL

:-1: error: skipping incompatible /usr/lib/libGL.so when searching for -lGL

:-1: error: cannot find -lGL

:-1: error: collect2: error: ld returned 1 exit status

Can you please help? It is driving me mad.

jsulm

@Dino What is the exact Qt version (not QtCreator!) you installed? Is it x86?
Also, you should execute

file /lib/libGL.so
file /usr/lib/libGL.so

and post the output here. It looks like you're mixing x86 and x86_64.

Dino

First of all, thank you for your help, jsulm.

This is the version I have installed: qt-opensource-linux-x64-5.9.0

And the following is the output requested:

[root@nelson bin]# file /usr/lib/libGL.so
/usr/lib/libGL.so: symbolic link to `libGL.so.1'

Dino

following the chain...

[root@nelson bin]# file /usr/lib/libGL.so.1
/usr/lib/libGL.so.1: symbolic link to `libGL.so.1.0.0'

file /usr/lib/libGL.so.1.0.0
/usr/lib/libGL.so.1.0.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped

indeed is look like I am mixing 32-bit and 64-bit but I do not know how to fix the problem. I am a novice on using Qt and CentOS 7

jsulm

@Dino You need to install the x64 OpenGL packages.

Dino

Dear jsulm,

I have listed installed packages and find out I have already the right OpenGL installed:

mesa-dri-drivers.x86_64 11.2.2-2.20160614.el7 @base
mesa-filesystem.x86_64 11.2.2-2.20160614.el7 @base
mesa-libEGL.i686 11.2.2-2.20160614.el7 @base
mesa-libEGL.x86_64 11.2.2-2.20160614.el7 @base
mesa-libEGL-devel.x86_64 11.2.2-2.20160614.el7 @base
mesa-libGL.x86_64 11.2.2-2.20160614.el7 @base
mesa-libGL-devel.x86_64 11.2.2-2.20160614.el7 @base
mesa-libGLES.x86_64 11.2.2-2.20160614.el7 @base
mesa-libGLU.x86_64 9.0.0-4.el7 @anaconda
mesa-libGLU-devel.x86_64 9.0.0-4.el7 @base
mesa-libgbm.i686 11.2.2-2.20160614.el7 @base
mesa-libgbm.x86_64 11.2.2-2.20160614.el7 @base
mesa-libglapi.x86_64 11.2.2-2.20160614.el7 @base
mesa-libxatracker.x86_64 11.2.2-2.20160614.el7 @base
mesa-private-llvm.x86_64

I have removed the 32-bit ones that also were in the system but I still get the compiler error. It looks like is skipping the files refusing to use them:

:-1: error: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../libGL.so when searching for -lGL

Is there a way to 'force' Qt to use them?

jsulm

@Dino Qt is not the problem here.
Where are the x86_64 OpenGL libs located?

Dino

Dear jsulm,

In the end, it was indeed a mess with 32-bit and 64-bit libraries.

To fix my problems I have to uninstall all version of Qt on my machine and all OpenGL libraries. Then I have installed the latest version of Qt and the mesa-libGL-devel-11.2.2-2.20160614.el7.x86_64.rpm package.

Again thank you for your help.

Kind Regards,

Dino