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how to debug Qt sources on mac

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  • D Offline
    D Offline
    davecotter
    wrote on last edited by
    #6

    cuz otherwise the app doesn't run

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

      It doesn't run from Qt Creator without the frameworks embedded ?

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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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      • D Offline
        D Offline
        davecotter
        wrote on last edited by davecotter
        #8

        yes that is correct

        i think what's going on there is that i'm linking to boost::threads and its dependencies (system and atomic), and macdeployqt magically manages all the necessary install_name_tool -change things even for my boost libraries, so i let it do its thing.

        I suppose for the debug release i could script those things myself? i haven't tried. but if it means i'll be able to use the debugger to step through Qt source code, then i'll have at it?

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        • D Offline
          D Offline
          davecotter
          wrote on last edited by
          #9

          do you think this is the problem? that in the debugger, the qt frameworks are loading from my app bundle?

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #10

            Since you ran macdeployqt and install_name_tools, you like have everything loaded from your application bundle rather than from your Qt installation.

            Note that you have the -use-debug-libs option for macdeploqt that should help.

            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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            • D Offline
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              davecotter
              wrote on last edited by
              #11

              okay so i eliminated macdeployqt from the equation, by manually calling install_name_tool on my boost libraries, and now the Qt libs are running from the Qt installation folder. yet i still can not debug (view or step through) the Qt Widgets or Core code:

              0_1560912795970_Screen Shot 2019-06-18 at 7.51.28 PM.png

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              • D Offline
                D Offline
                davecotter
                wrote on last edited by
                #12

                anyone have any further hints? have i set things up correctly? is what i'm trying to do even POSSIBLE?

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                • D Offline
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                  davecotter
                  wrote on last edited by
                  #13

                  pretty please?

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                  • H Offline
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                    HamishM
                    wrote on last edited by
                    #14

                    It looks like you are linked to the Qt release frameworks (QtCore.framework/Versions/5/QtCore), not the debug versions (QtCore.framework/Versions/5/QtCore_debug). When I am debugging in Xcode, I see the QtCore_debug filename, not QtCore.

                    I'm not sure how you fix this with Qt Creator. Are you actually debugging a debug build, with CONFIG = debug, not CONFIG = release?

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                    • D Offline
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                      davecotter
                      wrote on last edited by
                      #15

                      I believe so yes, if this is what you mean:

                      0_1561442040178_Screen Shot 2019-06-24 at 10.53.26 PM.png

                      now looking, i see i also have this line in my .pro file:

                      # this line makes qmake parse this file ONCE not three times
                      CONFIG -= debug_and_release
                      
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                      • D Offline
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                        davecotter
                        wrote on last edited by
                        #16

                        and are we sure i have my "source path mappings" set right? what SHOULD that be set to?

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                        • D davecotter

                          and are we sure i have my "source path mappings" set right? what SHOULD that be set to?

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                          HamishM
                          wrote on last edited by
                          #17

                          @davecotter debug looks fine.

                          I poked around in Xcode and found that the source for QCoreApplication for example lived at /Users/qt/work/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp

                          So your source mapping looks correct. I added that source mapping in lldb inside Xcode, using

                          settings set target.source-map /Users/qt/work/qt /Users/hamish/dev/Qt5.12.4/5.12.4/Src

                          and Xcode displayed the Qt source OK.

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                          • D Offline
                            D Offline
                            davecotter
                            wrote on last edited by
                            #18

                            your source mapping looks correct

                            well i provided two examples, so which one is correct? is itclang_64/bin or is itSrc?

                            how do i configure Qt Creator so that i can debug in Qt Creator debugger? I'm not directly using Xcode

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                            • D davecotter

                              your source mapping looks correct

                              well i provided two examples, so which one is correct? is itclang_64/bin or is itSrc?

                              how do i configure Qt Creator so that i can debug in Qt Creator debugger? I'm not directly using Xcode

                              C Offline
                              C Offline
                              christiani
                              wrote on last edited by
                              #19

                              @davecotter said in how to debug Qt sources on mac:

                              how do i configure Qt Creator so that i can debug in Qt Creator debugger? I'm not directly using Xcode

                              In the Run Settings you should tick the box that says "Use debug version of frameworks" or alternatively set the environment variable DYLD_IMAGE_SUFFIX=_debug.
                              See: https://doc.qt.io/qtcreator/creator-debugger-engines.html#debugging-tools-for-macos and https://doc.qt.io/qt-5/macos-issues.html#qt-libraries-as-frameworks

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                              • D Offline
                                D Offline
                                davecotter
                                wrote on last edited by
                                #20

                                i see no such "Use debug version of frameworks":

                                0_1561480846034_Screen Shot 2019-06-25 at 9.39.22 AM.png

                                but setting the environment variable worked!!

                                C 1 Reply Last reply
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                                • D davecotter

                                  i see no such "Use debug version of frameworks":

                                  0_1561480846034_Screen Shot 2019-06-25 at 9.39.22 AM.png

                                  but setting the environment variable worked!!

                                  C Offline
                                  C Offline
                                  christiani
                                  wrote on last edited by
                                  #21

                                  @davecotter said in how to debug Qt sources on mac:

                                  i see no such "Use debug version of frameworks":

                                  I just checked: It seems to be there only for automatically added run configurations.
                                  Yours is probably a Custom Executable run configuration which apparently doesn't have it.

                                  See also: https://doc.qt.io/qtcreator/creator-run-settings.html

                                  but setting the environment variable worked!!

                                  Good. Perhaps this topic could be marked as solved?

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