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Help : Segmentation fault when using a 3rd library

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  • T Offline
    T Offline
    Tissues
    wrote on last edited by
    #2

    One more thing, I saw an instruction on the smile website:

    Distributions built with gcc use the following compiler switches:
    -O3 -DNDEBUG -ffast-math

    Does anyone know how to add these codes?

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #3

      Hi,

      What exact error are you getting ?

      @DEFINES += NDEBUG@

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      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • T Offline
        T Offline
        Tissues
        wrote on last edited by
        #4

        Message I received:

        The inferior stopped becaquse it received a signal from the Operating System.
        Signal name: SIGSEGV
        Signal meaning: Segmentation fault

        I was using a tutorial code, trying to create a new object, but was stopped by Qt Creator.

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #5

          You should run it using a debugger, this would tell you where it happens

          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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          • T Offline
            T Offline
            Tissues
            wrote on last edited by
            #6

            Thany you for your reply. I'm new to Qt and I don't know what is a degubber. Now I am using Qt Creator and press F5 to debug my project. The debugging process stops at the line where I am going to declare a new object contained in the library.

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #7

              Then I suppose you are also new at programming ?

              Can you show the code ?

              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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              • T Offline
                T Offline
                Tissues
                wrote on last edited by
                #8

                I have some basic knowledge in C++ programming and one semester's course in data structure and algorithm, but I'm ignorant in interface development.

                I downloaded my library on this website:
                http://genie.sis.pitt.edu/index.php/downloads
                followed tutorial on this website:
                http://genie.sis.pitt.edu/wiki/SMILE_Documentation
                and wrote my own code:
                @#include "widget.h"
                #include <QApplication>
                #include "smile.h"

                int main(int argc, char *argv[])
                {
                DSL_network myNetwork;
                QApplication a(argc, argv);
                Widget w;
                w.show();

                return a.exec&#40;&#41;;
                

                }
                @

                Debugging process stopped at
                @DSL_network myNetwork;@

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #9

                  And what error are you getting ?

                  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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                  • T Offline
                    T Offline
                    Tissues
                    wrote on last edited by
                    #10

                    A message box with a title "Signal received", reading

                    The inferior stopped because it received a signal from the Operating System.
                    Signal name: SIGSEGV
                    Signal meaning: Segmentatio fault

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #11

                      Since you are using MinGW, your should already have a debugger then just click on the other green arrow, then one with the little bug, you should get more information

                      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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                      • T Offline
                        T Offline
                        Tissues
                        wrote on last edited by
                        #12

                        Application Output:
                        Debugging starts
                        can't find linker symbol for virtual table for 'QApplication' value

                        There are many warnings. Some read 'ignoring #pragma comment' while others 'unused parameter'. What is the problem?

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #13

                          Did you download the MinGW version ? If so, it's been compiled with MinGW 4.6.2 which is not compatible with 4.8

                          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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                          • T Offline
                            T Offline
                            Tissues
                            wrote on last edited by
                            #14

                            Oh, I am now using Qt creator 5.2.0 and MinGW4.8. How can I reduce MinGW to a 4.6.2 version?

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                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #15

                              You would need to install it by hand and also recompile Qt with it

                              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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                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #16

                                However, the download page also mention that you can request a build, so you could try to ask them about a version using MinGW 4.8

                                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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                                • T Offline
                                  T Offline
                                  Tissues
                                  wrote on last edited by
                                  #17

                                  Thx for your reply! I have downloaded Mingw32 4.6.2, but I want to ask how to recompile Qt with it.

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                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #18

                                    Just follow the "documentation":http://qt-project.org/doc/qt-5/windows-building.html

                                    However, I would recommend trying to ask a build for MinGW 4.8

                                    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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                                    • T Offline
                                      T Offline
                                      Tissues
                                      wrote on last edited by
                                      #19

                                      I've tried to follow the instruction, but it is complex for me. I just copied and pasted MinGW4.6.2 in the directory, and compiled the program. Now it stops at the very beginning and the Application Output window says
                                      Debugging starts
                                      (Internal error: pc 0x54f558 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f615 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f616 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f615 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f615 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406a80 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adc in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f615 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f558 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f615 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f616 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f615 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x54f615 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406a80 in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adc in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)
                                      (Internal error: pc 0x406adb in read in psymtab, but not in symtab.)

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                                      • SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #20

                                        Did you also compile Qt with that version of MinGW ?

                                        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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