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Problems when adding serialport module in Qt project

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  • douglasD douglas

    @Pablo-J.-Rogina Thanks a lot for your post, I'll now begin to put it into practice. I have just one doubt: if I run:

    qmake --version
    

    I obtain:

    QMake version 2.01a
    Using Qt version 4.8.7 in /usr/lib/x86_64-linux-gnu
    

    So, if I'm not wrong, the installed version of Qt is the 4.8.7 (quite old). When you stated, in your #1 step, "git clone git://code.qt.io/qt/qtserialport.git -b 5.9" were you assuming my Qt version was 5.9? In other words, the serialport version and the installed qt version should be the same?
    If so, how can I upgrade from my actual Qt version to the latest one?
    Thanks a lot!

    aha_1980A Offline
    aha_1980A Offline
    aha_1980
    Lifetime Qt Champion
    wrote on last edited by
    #38

    @douglas

    you can have multiple Qt versions installed, so please check carefully which one you use.

    For the qmakes that are not in PATH, you have to specify the full path, e.g. /opt/Qt/5.9.0/bin/qmake

    Regards

    Qt has to stay free or it will die.

    douglasD 1 Reply Last reply
    1
    • aha_1980A aha_1980

      @douglas

      you can have multiple Qt versions installed, so please check carefully which one you use.

      For the qmakes that are not in PATH, you have to specify the full path, e.g. /opt/Qt/5.9.0/bin/qmake

      Regards

      douglasD Offline
      douglasD Offline
      douglas
      wrote on last edited by
      #39

      @aha_1980 how I can upgrade to the latest Qt version and set it as default in my project? After this I will be sure to use the Qt version 5.9 and I will apply the steps suggested by @Pablo-J-Rogina
      Thank you!

      aha_1980A 1 Reply Last reply
      0
      • douglasD douglas

        @aha_1980 how I can upgrade to the latest Qt version and set it as default in my project? After this I will be sure to use the Qt version 5.9 and I will apply the steps suggested by @Pablo-J-Rogina
        Thank you!

        aha_1980A Offline
        aha_1980A Offline
        aha_1980
        Lifetime Qt Champion
        wrote on last edited by
        #40

        @douglas

        First you should find out which Qt versions you have on your computer. Qt 4.8.7 is surely from Ubuntu and is a native Qt - you build programs that run on your computer. What you want, is a cross Qt, to run programs on your embedded device.

        As you said you have already done this, you surely have a second Qt version (I cannot tell you which one it is). And this Qt version has a qmake which you need to call to compile Qt programs against this Qt library.

        Regards

        Qt has to stay free or it will die.

        douglasD 1 Reply Last reply
        1
        • aha_1980A aha_1980

          @douglas

          First you should find out which Qt versions you have on your computer. Qt 4.8.7 is surely from Ubuntu and is a native Qt - you build programs that run on your computer. What you want, is a cross Qt, to run programs on your embedded device.

          As you said you have already done this, you surely have a second Qt version (I cannot tell you which one it is). And this Qt version has a qmake which you need to call to compile Qt programs against this Qt library.

          Regards

          douglasD Offline
          douglasD Offline
          douglas
          wrote on last edited by
          #41

          @aha_1980 Thanks. In Qt Creator I set Qt 5.7.1 in the "Qt Version" for the selected kit for my project. Now I can add the serialport module in my .pro file and build the app, but when I try to run it on my target device, the application does not start and the following error appears:

          error while loading shared libraries: libQt5SerialPort.so.5: cannot open shared object file: No such file or directory
          

          Is it related to the serialport module that is not cross compiled or have I to install some dependencies on the target device itself?
          Thank you!

          aha_1980A 1 Reply Last reply
          0
          • douglasD douglas

            @aha_1980 Thanks. In Qt Creator I set Qt 5.7.1 in the "Qt Version" for the selected kit for my project. Now I can add the serialport module in my .pro file and build the app, but when I try to run it on my target device, the application does not start and the following error appears:

            error while loading shared libraries: libQt5SerialPort.so.5: cannot open shared object file: No such file or directory
            

            Is it related to the serialport module that is not cross compiled or have I to install some dependencies on the target device itself?
            Thank you!

            aha_1980A Offline
            aha_1980A Offline
            aha_1980
            Lifetime Qt Champion
            wrote on last edited by
            #42

            @douglas said in Problems when adding serialport module in Qt project:

            Is it related to the serialport module that is not cross compiled or have I to install some dependencies on the target device itself?

            You're already on the right track. You need to cross-compile QtSerialPort for your embedded device, and then you need to deploy (copy over) these libraries to the device, because your final app is also running there.

            Qt has to stay free or it will die.

            douglasD 2 Replies Last reply
            1
            • aha_1980A aha_1980

              @douglas said in Problems when adding serialport module in Qt project:

              Is it related to the serialport module that is not cross compiled or have I to install some dependencies on the target device itself?

              You're already on the right track. You need to cross-compile QtSerialPort for your embedded device, and then you need to deploy (copy over) these libraries to the device, because your final app is also running there.

              douglasD Offline
              douglasD Offline
              douglas
              wrote on last edited by
              #43

              @aha_1980 Ok,thanks! I just did the following on my host PC:

              $ git clone git://code.qt.io/qt/qtserialport.git
              $ mkdir qtserialport-build
              $ cd qtserialport-build
              $ qmake ../qtserialport/qtserialport.pro
              

              but the last command (qmake) gives the following:

              Project MESSAGE: Cannot build current QtSerialPort sources with Qt version 4.8.7.
              Project ERROR: Use at least Qt 5.0.0 or try to download QtSerialPort for Qt4.
              

              It is clear that I need to use a newer qmake, perhaps the default one is an older version. How can I run that command with a qmake version 5? Where should it be located? Or how can I "change the default one"?
              Thanks for your patience.

              1 Reply Last reply
              0
              • aha_1980A aha_1980

                @douglas said in Problems when adding serialport module in Qt project:

                Is it related to the serialport module that is not cross compiled or have I to install some dependencies on the target device itself?

                You're already on the right track. You need to cross-compile QtSerialPort for your embedded device, and then you need to deploy (copy over) these libraries to the device, because your final app is also running there.

                douglasD Offline
                douglasD Offline
                douglas
                wrote on last edited by
                #44

                @aha_1980 Done, I found the qmake for version 5 and run the qmake command.
                Now, when I run the

                make
                make install
                

                this error appears:

                fatal error: qdeadlinetimer.h: File o directory non esistente
                compilation terminated.
                

                Which can be the solution?

                aha_1980A 1 Reply Last reply
                0
                • douglasD douglas

                  @aha_1980 Done, I found the qmake for version 5 and run the qmake command.
                  Now, when I run the

                  make
                  make install
                  

                  this error appears:

                  fatal error: qdeadlinetimer.h: File o directory non esistente
                  compilation terminated.
                  

                  Which can be the solution?

                  aha_1980A Offline
                  aha_1980A Offline
                  aha_1980
                  Lifetime Qt Champion
                  wrote on last edited by
                  #45

                  @douglas you are tryin to compile a new QSerialPort against an older Qt.

                  Add a git checkout -b v5.7.1 directly after the git clone command and rebuild.

                  Qt has to stay free or it will die.

                  douglasD 1 Reply Last reply
                  0
                  • aha_1980A aha_1980

                    @douglas you are tryin to compile a new QSerialPort against an older Qt.

                    Add a git checkout -b v5.7.1 directly after the git clone command and rebuild.

                    douglasD Offline
                    douglasD Offline
                    douglas
                    wrote on last edited by
                    #46

                    @aha_1980 I add "git checkout -b v5.7.1" , but the qdeadlinetimer.h error shown above still remains during the make procedure. Any hints?

                    jsulmJ 1 Reply Last reply
                    0
                    • douglasD douglas

                      @aha_1980 I add "git checkout -b v5.7.1" , but the qdeadlinetimer.h error shown above still remains during the make procedure. Any hints?

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #47

                      @douglas Did you try to delete the build folder, create new one and to start from there?

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

                      douglasD 1 Reply Last reply
                      1
                      • jsulmJ jsulm

                        @douglas Did you try to delete the build folder, create new one and to start from there?

                        douglasD Offline
                        douglasD Offline
                        douglas
                        wrote on last edited by
                        #48

                        @jsulm Yes, I did. I always obtain the

                        fatal error: qdeadlinetimer.h: File o directory non esistente
                        compilation terminated.
                        
                        aha_1980A 1 Reply Last reply
                        0
                        • douglasD douglas

                          @jsulm Yes, I did. I always obtain the

                          fatal error: qdeadlinetimer.h: File o directory non esistente
                          compilation terminated.
                          
                          aha_1980A Offline
                          aha_1980A Offline
                          aha_1980
                          Lifetime Qt Champion
                          wrote on last edited by
                          #49

                          @douglas please send the output of git status

                          Qt has to stay free or it will die.

                          douglasD 1 Reply Last reply
                          0
                          • aha_1980A aha_1980

                            @douglas please send the output of git status

                            douglasD Offline
                            douglasD Offline
                            douglas
                            wrote on last edited by
                            #50

                            @aha_1980

                            Sul branch v5.7.1
                            Untracked files:
                              (use "git add <file>..." to include in what will be committed)
                            
                            	./
                            
                            nothing added to commit but untracked files present (use "git add" to track)
                            

                            Am I missing something?

                            aha_1980A 1 Reply Last reply
                            0
                            • douglasD douglas

                              @aha_1980

                              Sul branch v5.7.1
                              Untracked files:
                                (use "git add <file>..." to include in what will be committed)
                              
                              	./
                              
                              nothing added to commit but untracked files present (use "git add" to track)
                              

                              Am I missing something?

                              aha_1980A Offline
                              aha_1980A Offline
                              aha_1980
                              Lifetime Qt Champion
                              wrote on last edited by
                              #51

                              @douglas Looks good so far.

                              But let's move slowly. I re-read you post from 5 hours ago:

                              @aha_1980 Thanks. In Qt Creator I set Qt 5.7.1 in the "Qt Version" for the selected kit for my project. Now I can add the serialport module in my .pro file and build the app

                              If you can build the app, then you already have the serialport module!

                              but when I try to run it on my target device, the application does not start and the following error appears:

                              But you don't have the libraries on your target device.

                              Qt has to stay free or it will die.

                              douglasD 1 Reply Last reply
                              0
                              • aha_1980A aha_1980

                                @douglas Looks good so far.

                                But let's move slowly. I re-read you post from 5 hours ago:

                                @aha_1980 Thanks. In Qt Creator I set Qt 5.7.1 in the "Qt Version" for the selected kit for my project. Now I can add the serialport module in my .pro file and build the app

                                If you can build the app, then you already have the serialport module!

                                but when I try to run it on my target device, the application does not start and the following error appears:

                                But you don't have the libraries on your target device.

                                douglasD Offline
                                douglasD Offline
                                douglas
                                wrote on last edited by
                                #52

                                @aha_1980 Thanks, I understand. In order to obtain those libraries on my target device is something that I should copy from my host PC onto the device itself or I should install directly on the device side in any way?

                                aha_1980A Pablo J. RoginaP 2 Replies Last reply
                                0
                                • douglasD douglas

                                  @aha_1980 Thanks, I understand. In order to obtain those libraries on my target device is something that I should copy from my host PC onto the device itself or I should install directly on the device side in any way?

                                  aha_1980A Offline
                                  aha_1980A Offline
                                  aha_1980
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #53

                                  @douglas In the most easy and hacky way, just copy the needed *.so files to the other Qt *.so files on your device.

                                  Depending on your cross toolchain, there may be a more clean way (like building a new image), but that - as said - depends on you toolchain.

                                  Qt has to stay free or it will die.

                                  1 Reply Last reply
                                  1
                                  • douglasD douglas

                                    @aha_1980 Thanks, I understand. In order to obtain those libraries on my target device is something that I should copy from my host PC onto the device itself or I should install directly on the device side in any way?

                                    Pablo J. RoginaP Offline
                                    Pablo J. RoginaP Offline
                                    Pablo J. Rogina
                                    wrote on last edited by
                                    #54

                                    @douglas as @aha_1980 said, maybe easiest way is to copy the serialport module *.so the same way you're deploying the file(s) for your application. Perhaps at the beginning it's easy to copy the shared library into same folder as application's executable

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                                    douglasD 1 Reply Last reply
                                    0
                                    • Pablo J. RoginaP Pablo J. Rogina

                                      @douglas as @aha_1980 said, maybe easiest way is to copy the serialport module *.so the same way you're deploying the file(s) for your application. Perhaps at the beginning it's easy to copy the shared library into same folder as application's executable

                                      douglasD Offline
                                      douglasD Offline
                                      douglas
                                      wrote on last edited by
                                      #55

                                      @Pablo-J.-Rogina , @aha_1980 thank you. I expected to find the libQt5SerialPort.so.5 (the missing library) inside the qtserialport folder generated after the steps:

                                      $ git clone git://code.qt.io/qt/qtserialport.git
                                      $ mkdir qtserialport-build
                                      $ cd qtserialport-build
                                      $ qmake ../qtserialport/qtserialport.pro
                                      

                                      but I couldn't find it. I searched into my host PC for that file, I found few results, but they are located into the Qt installation folder, they are not cross-compiled for my needs, I think.
                                      When exactly that library should be created, or where it should be located?
                                      Thanks!

                                      jsulmJ 1 Reply Last reply
                                      0
                                      • douglasD douglas

                                        @Pablo-J.-Rogina , @aha_1980 thank you. I expected to find the libQt5SerialPort.so.5 (the missing library) inside the qtserialport folder generated after the steps:

                                        $ git clone git://code.qt.io/qt/qtserialport.git
                                        $ mkdir qtserialport-build
                                        $ cd qtserialport-build
                                        $ qmake ../qtserialport/qtserialport.pro
                                        

                                        but I couldn't find it. I searched into my host PC for that file, I found few results, but they are located into the Qt installation folder, they are not cross-compiled for my needs, I think.
                                        When exactly that library should be created, or where it should be located?
                                        Thanks!

                                        jsulmJ Offline
                                        jsulmJ Offline
                                        jsulm
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #56

                                        @douglas Are you sure you're cross compiling your app?
                                        If so just do

                                        ldd YOUR_APP_EXE
                                        

                                        it will show you which libs it is linked against, you then will know where the serial port lib is.

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

                                        douglasD 1 Reply Last reply
                                        1
                                        • jsulmJ jsulm

                                          @douglas Are you sure you're cross compiling your app?
                                          If so just do

                                          ldd YOUR_APP_EXE
                                          

                                          it will show you which libs it is linked against, you then will know where the serial port lib is.

                                          douglasD Offline
                                          douglasD Offline
                                          douglas
                                          wrote on last edited by
                                          #57

                                          @jsulm the ldd command does not give any result; it gives a message saying it is "not a dynamic exacutable"..

                                          1 Reply Last reply
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