Qt 5.2.0 Releated Questions?

[mp33919]

Recently I installed Qt 5.2.0 in Windows 7 success (?) and tried to install in Centos 6.0 but failed. I just wonder is there anyone has successful stories about both machines?

1. In Windows 7, I installed qt-windows-opensource-5.2.0-mingw48_opengl-x86-offline.exe (my Windows 7 is set for 32 bits). It seems to me to use Qt Designer to create GUI and using its signal/slot tools did not work. (I have used Qt 3.3.6 in RedHat 5.X for years, to set for singal/slot worked very friendly and easily.) Does anyone has the same problem? I purchased two books: C++ GUI Programming with Qt 4 2nd edition by Jasmin Blanchette, and Advanced Qt Programing, Creating Great Sofware with C++ and Qt 4. Both books has talked very little about using Qt Designer to generate GUI, I wonder why? I knew the books are for Qt 4, but there is no Qt 5.2 book available ...)

2. I Centos 6.0, I tried to install from qtx11extras-opensource-src-5.2.0.tar.gz, it failed. Then, I tried to install from qt-linux-opensource-5.2.0-x86_64-offline.run, it failed, too. (my Centos 6.0 machine is set for 64 bits) Can anyone instruct me how to install Qt 5.2.0 into Centos 6.0?

Thanks

[wysota]

Please provide more details about your problems. It is hard to help you in any way knowing only that something "fails".

[mp33919]

Thanks for your reply. Yes, I understand to describe something with "fail" without details are not a good way for asking some helps. But, since I had tried many ways and eventually crashed my system unexpectedly, it is a little hard to write down exactlly what happeded. So, let me started with install qt-linux-opensource-5.2.0-x86_64-offline.run in my Centos 6.0 first:
1. run the .run program
2. installer starts normally; I select ALL; I agreed Qt installer LGPL Agreement.
3. Qt installer start to install components, such as Essentials, Qt Creator, Essential Modules, ...
4. After installing "Create uninstaller", I press the "Finish" button. The README.txt file pops up. I think the Qt creator installation is done.
5. I went to menu bar, under "Programming", I found two newly created "Qt Creator" and "Qt Creator (Opensource)" in it.
6. Double click on Qt Creator (Opensource) -- nothing happened.
7. Double click on Qt Creator: a message pops out: "Could not Launch Qt Creator": Failed to change directory /home/user_me/Qtcreator-3.0.0 (no such file or directory)
8. It is true, I could not find anything about Qtcreator-3.0.0 in my machine. (But, why Qtcreator-3.0.0? even I could find it, should I need somthing Qtcreator 5.2....?)
9. Anyway, at this moment, I think the installation of Qt5.2.0 from qt-linux-opensource-5.2.0-x86_64-offline.run failed. I could start to install Qt 5.2.0 from qtx11extras-opensource-src-5.2.0.tar.gz
10. Is there anyway I could fix it before I un-install the Qt5.2.0 at this point?

Thanks.

[wysota]

Did you run the installation as root or as a normal user? What directory did you choose for the installation? Did you have appropriate access rights there?

[ChrisW67]

You appear to have tried installing a standalone QtCreator 3 at some stage in the past: this is the source of the desktop icon "Qt Creator"

Qt Creator 3.0 is the version bundled with Qt5.2 in the binary download but that installer creates the other desktop icon pointing to ots bundles Qt Creator instance. The Qt bundle installer asks you for an install location and simply unpacks the entire installation under there. Apart from the desktop icons nothing goes outside that folder. The place to look for the install is where you told the installer to put it.

The Qt X11 Extras installer is not needed to get a basic Qt install working on Linux.

[mp33919]

It might have been all the problems I have: I use as regular user not the root. Should I un-install it and use root to try again?
I installed the Qt to /home/user_me/Qt5.2.0
PS: the /user_me is my personal directory when I use it as a regular user.

---

Added after 16 minutes:

Yes, you are correct. I have Qt3.X in my system and I am still using it. I use it to migrate my Qt3.X programs from my old RedHat 5 32 bits machine to this Centos 6 64 bits. I wanted to write new projects with this Qt5.2.0. if I could get the Qt5.2.0 works. At the mean time, I hope that I could use Qt5.2.0 in my Windows 7 machine(s) so that I could have all my machines used the same IDE.
So, I couldn't get rid of Qt3.X.

[wysota]

It might have been all the problems I have: I use as regular user not the root. Should I un-install it and use root to try again?

No, installing as regular user is ok.

I installed the Qt to /home/user_me/Qt5.2.0

Then look into /home/user_me/Qt5.2.0/Tools/QtCreator/bin. You should see QtCreator there.

So, I couldn't get rid of Qt3.X.

Qt3 can live alongside Qt5 just fine.

[mp33919]

Yes, I did use prompt:
/home/user_me/Qt5.2.0/Tools/QtCreator/bin]$ ./qtcreator

I got the errors as below:

Failed to load core: Can not load library /home/user_me/Qt5.2.0/Tools/QtCreator/lib/qtcreator/plugins/QtProject/libCore.so : Can not load library /home/user_me/Qt5.2.0/Tools/QtCreator/lib/qtcreator/plugins/QtProject/libCore.so : (usr/lib64/libstdc++.so 6: Version 'GLIBCXX_3.4.15' not found (required by /home/user_me/Qt5.2.0/Tools/QtCreator/lib/qtcreator/plugins/QtProject/../.././libQt5CLucene.so.5))

I have checked both files libCore.so and libstdc++.so.6 are all in the directory as the error message specified.
They are:
-rwxr-xr-x. 1 me me Dec 10 11:49 libCore.so
lrwxrwxrwx. 1 root root 19 Oct 2 2012 libstdc++.so.6 -> libstdc++.so.6.0.13

"me" is my user name

So the QtCreator can not be launched.

[wysota]

Try with qtcreator.sh

It seems you have an old system that doesn't have libstdc++6 installed.

[mp33919]

Same error messages!

[ChrisW67]

The error message plainly explains that the library it is finding is not " Version 'GLIBCXX_3.4.15' " and therefore too old to be used. This is probably because your GCC is older than 4.6, probably GCC 4.4 or older. You are five release behind the current CentOS, so this should not be a surprise (although the current version still ships GCC 4.4.7)

Update libstdc++. I do not know if it is a standalone package or part of GCC.

There is even a Qt Project wiki page on dealing with the dated nature of CentOS by installing a private GCC version:
http://qt-project.org/wiki/How-to-In...wt-on-CentOS-6