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[Launchpad Bug Tracker <1304709@xxxxxxxxxxxxxxxxxx>]

[Expired for qtbase-opensource-src (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: qtbase-opensource-src (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1304709

Title:
  Runtime signal connection errors when using the new signal style

Status in Ubuntu UI Toolkit:
  Invalid
Status in qtbase-opensource-src package in Ubuntu:
  Expired

Bug description:
  In the ubuntu download manager we are using the new connection style
  syntax (http://qt-project.org/wiki/New_Signal_Slot_Syntax) so that if
  there are errors in the signal connections we will be notified at
  compile time. However, in recent versions of udm we have noticed that
  the udm tests that ensure that the qt signals are emitted correctly
  have started failing randomly in the build servers.

  As it can be seen in the following build logs the compilation does
  finish with no errors but the tests raise errors at runtime (an assert
  was added for each of the connect calls in the project):

  https://launchpadlibrarian.net/172280588/buildlog_ubuntu-trusty-powerpc.ubuntu-download-manager_0.3%2B14.04.20140408.1-0ubuntu1_FAILEDTOBUILD.txt.gz
  https://launchpadlibrarian.net/172280333/buildlog_ubuntu-trusty-arm64.ubuntu-download-manager_0.3%2B14.04.20140408.1-0ubuntu1_FAILEDTOBUILD.txt.gz
  https://launchpadlibrarian.net/172280872/buildlog_ubuntu-trusty-armhf.ubuntu-download-manager_0.3%2B14.04.20140408.1-0ubuntu1_FAILEDTOBUILD.txt.gz

  Some of the errors between the diff archs are the same but this feels
  like a coincidence. The unity-scope-click package project has had the
  same issue and has solved it in the following way:

  scope/click/download-manager.cpp (123)

   // NOTE: using SIGNAL/SLOT macros here because new-style
      // connections are flaky on ARM.
      c = connect(impl->systemDownloadManager.data(), SIGNAL(downloadCreated(Download*)),
                  this, SLOT(handleDownloadCreated(Download*)));

      if (!c) {
          qDebug() << "failed to connect to systemDownloadManager::downloadCreated";

      }

  
  It is very interesting that the tests have never (so far) failed in the other 2 architectures (i386, amd64). I'm raising this issue because it might be hitting us in some other projects.

  PS: I'm reporting this error here after talking with zoltan but I
  think is something that should be taken upstream or in qt5core5.

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