Cannot get any query output from executable "/opt/Qt/6.2.2/gcc_64/bin/qmake"

[Jorge_Adan]

I downloaded the latest linux build, and when I run the Installer on the Default build, I continue to get this error. I have searched online concerning this issue for a couple of days, but have been unable to figure out what is going on.
Can anyone point me in the right direction?

Here is my kernel and processor information

[devuser@localhost Downloads]$ uname -rp
3.10.0-1160.45.1.el7.x86_64 x86_64

[SGaist]

Hi and welcome to devnet,

What happens if you install it as your standard user in your home directory ?

[Jorge_Adan]

Yes, I get the exact same eror.

[SGaist]

What if you install 6.2.1 ?

[Jorge_Adan]

I get the same error with every version I try to install, including 5.

[SGaist]

Which version of the installer are you using ?

[Jorge_Adan]

qt-unified-linux-x64-4.1.1-online.run

[SGaist]

This is not the latest version. You should get the latest installer.

[Jorge_Adan]

@SGaist I downloaded and tried to install qt-unified-linux-x64-4.2.0-online.run, and I received the exact same error.

I noticed here that CentOS 7 is not listed in the supported configurations. Could that be an issue?

[SGaist]

I wonder if there are some compatibility issues...
Did you try to execute qmake directly from what could be installed to see what is going wrong there ?

[Jorge_Adan]

@SGaist I just followed the instructions for building Qt5 from source. At this point, I don't care if it's Qt5 or Qt6.
My new qmake is installed at: /opt/qt5-build/qtbase/bin/qmake. It appears that it is working correctly, but there is no QtCreator in my build.

I will try to install from the online installer again, ignore the errors, and see what qmake does.

BACKGROUND

I have a CMake project that I created on a Ubuntu machine. It works. All I need to do is to install Qt on my CentOS 7 machine and build this project.

[Jorge_Adan]

I installed again and ignored the error that I posted earlier.
After installing 6.2.2 again, upon trying to run QtCreator, I receive the following error:

[devuser@localhost ~]$ ./Qt/Tools/QtCreator/bin/qtcreator
./Qt/Tools/QtCreator/bin/qtcreator: error while loading shared libraries: libQt6Core.so.6: cannot open shared object file: No such file or directory

I do have that library...

[devuser@localhost ~]$ locate libQt6Core.so.6
/home/devuser/Qt/6.2.2/gcc_64/lib/libQt6Core.so.6
/home/devuser/Qt/6.2.2/gcc_64/lib/libQt6Core.so.6.2.2
/home/devuser/Qt/Tools/QtCreator/lib/Qt/lib/libQt6Core.so.6
/home/devuser/Qt/Tools/QtCreator/lib/Qt/lib/libQt6Core.so.6.2.1

[JonB]

@Jorge_Adan
Start by running ldd ./Qt/Tools/QtCreator/bin/qtcreator. Look through the output for libQt6Core.so.6. Assuming from what you say that is does not say "file not found", look through all its dependencies and see whether one of them is not found. That can lead to the error message reporting it on libQt6Core.so.6 when in fact the issue is another file.

I also note your output shows different versions of libQt6Core.so.6.2.x in different places. I don't know whether the different versions is problematic. You can run ldd on those too.

[Jorge_Adan]

@JonB Here is my output, using ldd:

w[devuser@localhost ~]$ ldd ./Qt/Tools/QtCreator/bin/qtcreator | grep -i libqt6core.so.6
./Qt/Tools/QtCreator/bin/qtcreator: /lib64/libz.so.1: version `ZLIB_1.2.9' not found (required by /home/devuser/./Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt6Gui.so.6)
./Qt/Tools/QtCreator/bin/qtcreator: /lib64/libm.so.6: version `GLIBC_2.27' not found (required by /home/devuser/./Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt6Gui.so.6)
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found
	libQt6Core.so.6 => not found

[JonB]

@Jorge_Adan
You will have to await others to comment on your two lines in green. Maybe they are the issue, I don't know.
I am still a little unsure on whether the libQt6Core.so.6 => not found messages are that that it cannot find that actual file or dependencies for it. You might like to look through the output paged into more/less instead of grepping to understand just what it is telling you.

[JoeCFD]

@Jorge_Adan centOS7 could be the issue. You may try to build it from Qt source. Or upgrade centOS to the latest.

[JoeCFD]

@Jorge_Adan You might not set /home/devuser/Qt/6.2.2/gcc_64/lib to LD_LIBRARY_PATH

[Jorge_Adan]

@JoeCFD Yes, I've tried that. I receive the same error.

[JoeCFD]

@Jorge_Adan You might add it to the wrong spot. Can you please tell how you added it? Also show the full list of your home dir by command ls -al.
Normally you do not install third party in /home/devuser/. Instead, install them under somewhere like /opt/thirdParties which is user name independent.

First thing, try this on your terminmal:
export LD_LIBRARY_PATH=/home/devuser/Qt/6.2.2/gcc_64/lib:$LD_LIBRARY_PATH
./Qt/Tools/QtCreator/bin/qtcreator

you also need to add /Qt/Tools/QtCreator/bin and /home/devuser/Qt/6.2.2/gcc_64/bin to PATH

Check your gcc version by
gcc --version
I believe it is 4.8.5 which can not support Qt 6. Qt 6 needs C++17

[Jorge_Adan]

@JoeCFD In ~/.bash_profile:

export LD_LIBRARY_PATH=/usr/local/lib64:/home/devuser/Qt/6.2.2/gcc_64/lib/:$LD_LIBRARY_PATH

Then in terminal: source ~/.bash_profile.

I also create an alias:

alias qtcreator=$HOME/Qt/Tools/QtCreator/bin/qtcreator

in order to force the newly installed qtcreator get called. If I don't, it calls: /usr/bin/qtcreator, which was installed as part of the CentOS 7 build as Qt4.

I still get the same error:

[devuser@localhost ~]$ qtcreator
/home/devuser/Qt/Tools/QtCreator/bin/qtcreator: error while loading shared libraries: libQt6Core.so.6: cannot open shared object file: No such file or directory

Concerning gcc:

[devuser@localhost ~]$ gcc --version
gcc (GCC) 10.1.0