Can't build chip example - /usr/bin/ld: cannot find -lGL

qalex

Hello.
I just installed CentOS Linux release 7.5.1804, Qt 4.8.7 using yum (base repo) and Qt Creator 4.6.1 using online installer.
I have NVIDIA video card on may notebook and I installed NVIDIA driver.
Demo applications, those are provided with Qt in binary form, work fine - chip for example - and OpenGL is supported.
But when I try to build it (chip example), I get the following linker error:

g++  -o chip main.o mainwindow.o view.o chip.o moc_mainwindow.o moc_view.o qrc_images.o    -L/usr/lib64 -L/usr/X11R6/lib -lQtOpenGL -lQtGui -lQtCore -lGL -lpthread
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible //lib/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible //usr/lib/libGL.so when searching for -lGL
/usr/bin/ld: cannot find -lGL
collect2: error: ld returned 1 exit status

I have libGL.so in /usr/lib64, I have mesa-libGL and mesa-libGL-devel packages installed.
How to solve the problem?

SGaist

Hi,

Might be a silly question but are you sure you are building your application in 64bit ?

qalex

@SGaist said in Can't build chip example - /usr/bin/ld: cannot find -lGL:

Hi,

Might be a silly question but are you sure you are building your application in 64bit ?

Hi @SGaist, thanks for the reply first.
I don't think your question is silly - I was also thinking about that when I saw the paths where ld was searching the lib, but ...
I uninstalled NVIDIA driver, screen resolution on my notebook is ugly now, but chip example is compiled and linked without any errors! And when I run the chip example OpenGL is supported!
As far as I understand, installation of NVIDIA video card driver breaks ... something in ... somewhere :) But I have no idea what and where, and how to fix it :(
Maybe you know the way how to tell Qt to use NVIDIA driver, or OpenGL lib, or ... something to fix the problem?
Thanks in advance for answering.

SGaist

How did you install the Nvidia stuff ?

qalex

@SGaist
I install NVIDIA driver by compiling it - I must have kernel-headers and kernel-devel packages installed. Installation is done by root on level 3 - X is not running. I installed NVIDIA driver before Qt installation.

SGaist

What about the associated OpenGL libraries ?

qalex

@SGaist

Here are the libs:

[user@centos-7 ~]$ ls -h /usr/lib64/ | grep "libGL"
libGLdispatch.so.0
libGLESv1_CM_nvidia.so.1
libGLESv1_CM_nvidia.so.390.59
libGLESv1_CM.so
libGLESv1_CM.so.1
libGLESv1_CM.so.1.2.0
libGLESv2_nvidia.so.2
libGLESv2_nvidia.so.390.59
libGLESv2.so
libGLESv2.so.2
libGLESv2.so.2.1.0
libGL.la
libGL.so
libGL.so.1
libGL.so.1.7.0
libGLU.so
libGLU.so.1
libGLU.so.1.3.1
libGLX_indirect.so.0
libGLX_nvidia.so.0
libGLX_nvidia.so.390.59
libGLX.so
libGLX.so.0

Do you mean anything else?

SGaist

How did you instal them ?

qalex

The problem is solved - I install NVIDIA the latest driver (version: 390.67 release Date: 2018.6.5) in this way: http://www.advancedclustering.com/act_kb/installing-nvidia-drivers-rhel-centos-7/.

qalex

@SGaist said in Can't build chip example - /usr/bin/ld: cannot find -lGL:

How did you instal them ?

I download shell script from NVIDIA and started it in terminal.

The problem is solved by installing the latest NVIDIA drivers (version: 390.67 release Date: 2018.6.5) in that way: http://www.advancedclustering.com/act_kb/installing-nvidia-drivers-rhel-centos-7/.

SGaist

Glad you found out and thanks for sharing !

Since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)