When starting gdb with application message "Debugging Helper Missing" is displayed [Solved]


  • Moderators

    I have compiled on my own Qt 4.8.3 with MinGW 4.6. Later I have compiled also Qt creator 2.6.0 with same compiler against the same Qt version.
    When I am debugging my other applications Qt creator is complaining that the message "Debugging Helper Missing". The details given in the box are:
    @
    The debugging helper library was not found at C:/Qt/4.8.3_MinGW/qtc-debugging-helper/, C:/Source/creator_build/qtc-debugging-helper/110536423/, C:\Users\xxxxxx\AppData\Local\QtProject\QtCreator/qtc-debugging-helper/110536423/.
    @

    I am using GDB for debugging and the tool chain settings seem to be ok.

    I have checked and could not even find these qtc-debugging-helper folders therefore also no content.

    On my laptop I have Qt 4.8.4 compiled with MinGW 4.7.2. Qt creator is 2.6.1 (precompiled version installed). I have started the debug version of the application, which obtains the complaint above, but it does not show there.



  • Did you build the helper? Preferences -> Build & Run -> Qt Versions -> (select a version and look at details for Helpers.


  • Moderators

    I cannot. I says "not needed" for "GDB Helper". Also for the the others BTW. On the laptop where I do not see the problem, it says also "not needed".

    Overall it is a bit strange. When following the advice displayed through the message box it doesn't lead somewhere obvious. After several attempts over time (since just bugs me a bit) I found that I had to check under "Helpers: QML Dump.", which I think is a bit misleading. I am doing pure C++ programming, so why should I care about anything with QML.

    Finding the options greyed and knowing the fact that I have probably unchecked all QML it could be that part of QML is used by Qt creator. However, this is not overall conclusive, since the menu of the pre-compiled Qt creator version on my laptop has all greyed as well.



  • There is indeed no need to compile GDB helpers for Windows as the functionality is realized using a Python script nowadays (since Qt Creator 2.0). Check your debugger settings in the Buiild and Run -> Kits settings, and make sure it points to a Python-enabled build of GDB as shipped with the Qt SDK, or a copy from http://builds.qt-project.org/, but not to one of a stock MinGW installation which typically does not support Python scripting.

    [Edit: Just in case someone stumbles over this in the future: Recent builds of stock MinGW GDB's do have working Python scripting, and do work with Creator out-of-the-box.]


  • Moderators

    [quote author="andrep" date="1357304512"]There is indeed no need to compile GDB helpers for Windows as the functionality is realized using a Python script nowadays (since Qt Creator 2.0). Check your debugger settings in the Buiild and Run -> Kits settings, and make sure it points to a Python-enabled build of GDB as shipped with the Qt SDK, or a copy from http://builds.qt-project.org/, but not to one of a stock MinGW installation which typically does not support Python scripting.[/quote]
    Thanks a lot. That did the trick.
    I have downloaded "this archive":http://builds.qt-project.org/view/All/job/gdb-windows/lastSuccessfulBuild/artifact/build-creator-gdb-mingw/qtcreator-gdb-7.4-MINGW32_NT-6.1-i686.tar.gz and copied the contents to a separate directory. The only left was choosing the gdb.exe under "build&run"->"Kits".
    The GDB I used was the one shipped with MinGW 4.6.2.

    On my laptop I am using MinGW 4.7.2 and its GDB version. This did not ask for the helpers. Not clear to me at the moment what is happening there. Either MinGW has now a Phyton-enabled GDB bundled :) or I got a mixture of versions :(


  • Moderators

    To conclude this discussion. Also the GDB version bundled with MinGW 4.7.2 is not phyton-enabled. So andrep's statement is completely correct.



  • I eventually found this very helpful thread, but had some trouble finding a Python-enabled version of gdb.

    I finally found it here:

    http://origin.releases.qt-project.org/gdb/

    (Note that the "this archive" link above provided by koanIg on Jan 6 is broken. In the likely event that this link will also be broken at some point in the future, you may be able to find it, as we did, via a google search for "gdb python binaries windows". )



  • MinGW provides mingw32-gdb-python. The executable in my case is gdb-python27.exe. I also had to install Python 2.7 separately (direct from Python website). I'm not 100%... but I think this is working.


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