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Library errors when debugging with Qt Creator

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  • T Offline
    T Offline
    tkansgar
    wrote on last edited by
    #1

    Hi all,

    I develop under Ubuntu 14.04, use Qt Creator 3.6.0 (based on Qt 5.5.1) and debug my qt programs with it for many years now. But since I ported the source code from Qt 4.8.7 and linked it to Qt 5.10.0, I cannot debug my programs with Qt Creator. The output in xterm window displayed by Qt Creator is like this:

    /home/<path-to-my-qt-program>: /opt/qt/qtcreator-3.6.0/lib/Qt/lib/libQt5Core.so.5: no version information available (required by /home/<one-of-my-so-libs>)

    Many similar lines with different so-libs and different Qt5-so-libs follow here.

    Outside of Qt Creator my programs run properly. Obviously the Qt5-so-libs of the Qt Creator installation instead those of my Qt 5.10.0 installation are loaded when starting the debug session by Qt Creator.

    I substituted the path to /opt/qt/qtcreator-3.6.0/lib/Qt/lib by the path to the so-libs of my Qt 5.10.0 installation in LD_LIBRARY_PATH and PATH in the execution environment settings of the Qt Creator project. But this didn't help. What must be done to debug a program linked to Qt 5.10.0 using Qt Creator 3.6.0 based on Qt 5.5.1?

    Kind Regards
    tkansgar

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    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi and welcome to devnet,

      What's fishy in the first place is that you are trying to use the Qt Version from Qt Creator rather than a standalone Qt.

      Why are you doing that ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      1
      • T Offline
        T Offline
        tkansgar
        wrote on last edited by
        #3

        Hi SGaist,

        Qt Creator didn't run with my Qt 5.10.0 installation. I had to set its LD_LIBRARY_PATH to its own Qt 5.5.1 lib path in qtcreator.sh (see https://bugreports.qt.io/browse/QTCREATORBUG-19611). So, how do I direct Qt Creator to start the debug session with the lib set of Qt 5.10.0 instead of its own Qt 5.5.1?

        Kind Regards
        tkansgar

        aha_1980A 1 Reply Last reply
        0
        • T tkansgar

          Hi SGaist,

          Qt Creator didn't run with my Qt 5.10.0 installation. I had to set its LD_LIBRARY_PATH to its own Qt 5.5.1 lib path in qtcreator.sh (see https://bugreports.qt.io/browse/QTCREATORBUG-19611). So, how do I direct Qt Creator to start the debug session with the lib set of Qt 5.10.0 instead of its own Qt 5.5.1?

          Kind Regards
          tkansgar

          aha_1980A Offline
          aha_1980A Offline
          aha_1980
          Lifetime Qt Champion
          wrote on last edited by
          #4

          @tkansgar I'd recommend using the online installer to do a clean install of Qt 5.10 together with a recent QtCreator version.

          That should work well on Ubuntu 14.04 without tricks (but only if you using 64bit, there are no 32bit binary packages for newer Qt/Creator versions).

          Qt has to stay free or it will die.

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          • T Offline
            T Offline
            tkansgar
            wrote on last edited by
            #5

            Hi aha_1980,

            my Qt 5.10.0 installation is definitely clean, and that of Qt Creator 3.6.0 too. Is it really not possible to start a debug session using another Qt 5 version as Qt Creator uses? So I have to upgrade Qt Creator too, when I upgrade the Qt 5 version for my programs?

            Kind Regards
            tkansgar

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            • aha_1980A Offline
              aha_1980A Offline
              aha_1980
              Lifetime Qt Champion
              wrote on last edited by aha_1980
              #6

              @tkansgar said in Library errors when debugging with Qt Creator:

              Is it really not possible to start a debug session using another Qt 5 version as Qt Creator uses?

              I didn't say it is impossible. Indeed, Qt Creator can handle other Qt versions and I do this all day.

              So I have to upgrade Qt Creator too, when I upgrade the Qt 5 version for my programs?

              No, you don't have. I just wanted to point out, if you install both Qt and Creator with the online installer you get a running system without manual intervention.

              And ... there were 6 QtCreator releases after 3.6.0, with the 7th already in beta phase. I personally would not spend a minute configuring such an old version.

              Qt has to stay free or it will die.

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              • T Offline
                T Offline
                tkansgar
                wrote on last edited by
                #7

                Hi again,

                ok, I understand. But not any one did answer my question until now:

                So, how do I direct Qt Creator to start the debug session with the lib set of Qt 5.10.0 instead of its own Qt 5.5.1?

                You say, you do this, but how do you do it?

                Kind Regards
                tkansgar

                jsulmJ 1 Reply Last reply
                0
                • T tkansgar

                  Hi again,

                  ok, I understand. But not any one did answer my question until now:

                  So, how do I direct Qt Creator to start the debug session with the lib set of Qt 5.10.0 instead of its own Qt 5.5.1?

                  You say, you do this, but how do you do it?

                  Kind Regards
                  tkansgar

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #8

                  @tkansgar In my opinion the correct question is: how did you manage to let QtCreator use its own Qt libs for your app? You should check the Kit you're using in QtCreator whether it is configured correctly.

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  1 Reply Last reply
                  1
                  • T Offline
                    T Offline
                    tkansgar
                    wrote on last edited by
                    #9

                    Hi jsulm,

                    thanks for your reply! I didn't manage to let QtCreator use its own Qt libs for my apps. Instead I managed to start QtCreator using its own Qt libs. And until now I never saw any need to configure any kit in QtCreator. Can you give me a little lesson, how I have to do the configuration? Keep in mind, that some other apps I develop, use Qt 4.8.7, which I want to debug with the same QtCreator. Seems, that I need two differently configured kits.

                    Kind Regards
                    tkansgar

                    aha_1980A 1 Reply Last reply
                    0
                    • T tkansgar

                      Hi jsulm,

                      thanks for your reply! I didn't manage to let QtCreator use its own Qt libs for my apps. Instead I managed to start QtCreator using its own Qt libs. And until now I never saw any need to configure any kit in QtCreator. Can you give me a little lesson, how I have to do the configuration? Keep in mind, that some other apps I develop, use Qt 4.8.7, which I want to debug with the same QtCreator. Seems, that I need two differently configured kits.

                      Kind Regards
                      tkansgar

                      aha_1980A Offline
                      aha_1980A Offline
                      aha_1980
                      Lifetime Qt Champion
                      wrote on last edited by
                      #10

                      @tkansgar The basic steps are described here:

                      http://doc.qt.io/qtcreator/creator-targets.html

                      In short: you need to setup a compiler and a debugger (in Linux you use the existing ones), add a Qt version by selecting it's qmake and then combine everything to a Kit. Voila.

                      As said, that is all automatic when installing by the online installer.

                      Qt has to stay free or it will die.

                      1 Reply Last reply
                      0
                      • T Offline
                        T Offline
                        tkansgar
                        wrote on last edited by
                        #11

                        Hi,

                        I just configured two kits, one for Qt 5.10.0, and one for Qt 4.8.7. QtCreator knows both of them. No need to add one. At Qt Version I selected the desired one, and at Environment I set LD_LIBRARY_PATH to not contain the Qt 5.5.1 lib path but the path to the libs of the desired Qt version. In the project settings under build & run I switched the kit from the default named "Desktop" to my new Qt 5.10.0 kit. Then I started a debug session. But that uses the libs of Qt 5.5.1 from the QtCreator lib path anyway. The errors remain the same as in my first posting here. Anything is missing, but what?

                        Kind Regards
                        tkansgar

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                        0
                        • T Offline
                          T Offline
                          tkansgar
                          wrote on last edited by
                          #12

                          Hi again,

                          I think, now I have found and fixed my misstake: I always started the debug session by using the menu entry "Debug external application". In this dialog I could specify all relevant data like the path to the executable, the command line arguments and the execution directory. Now I found, that there also is a selection for the kit to use, which I ignored until now. But its selection list is empty (cannot be opened), although the "Manage" button is accessible and my new kits are known there.

                          I then copied the execution data from this dialog to the execution data in the project settings and then used the menu entry "Debug without deployment", and now the debug session is running.

                          Many thanks for your help here
                          tkansgar

                          aha_1980A 1 Reply Last reply
                          1
                          • T tkansgar

                            Hi again,

                            I think, now I have found and fixed my misstake: I always started the debug session by using the menu entry "Debug external application". In this dialog I could specify all relevant data like the path to the executable, the command line arguments and the execution directory. Now I found, that there also is a selection for the kit to use, which I ignored until now. But its selection list is empty (cannot be opened), although the "Manage" button is accessible and my new kits are known there.

                            I then copied the execution data from this dialog to the execution data in the project settings and then used the menu entry "Debug without deployment", and now the debug session is running.

                            Many thanks for your help here
                            tkansgar

                            aha_1980A Offline
                            aha_1980A Offline
                            aha_1980
                            Lifetime Qt Champion
                            wrote on last edited by
                            #13

                            @tkansgar so please close this thread as solved now. thanks

                            Qt has to stay free or it will die.

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