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  1. Qt
  2. QTBUG-88185

QMapNode and strict-aliasing

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Done
    • Affects Version/s: 5.15.1
    • Fix Version/s: None
    • Labels:
      None
    • Platform/s:
      Linux/X11
    • Commits:
      6e60921290892ac0fcf625c5025845eb0334880e (qt/qtbase/5.15)

      Description

      Latest GCC 10.2 in latest Qt found reinterpret-cast<> as:

      /usr/include/qt/QtCore/qmap.h:212: error: dereferencing type-punned pointer might break strict-aliasing rules [-Werror=strict-aliasing]
      /usr/include/qt/QtCore/qmap.h:863:35: required from ‘QMap<K, V>::iterator QMap<K, V>::find(const Key&) [with Key = QString; T = QString]’
      ../ed_highway/stringsfilecache.cpp:243:42: required from here
      /usr/include/qt/QtCore/qmap.h:212:52: error: dereferencing type-punned pointer might break strict-aliasing rules [-Werror=strict-aliasing]
       212 | Node *end() \{ return reinterpret_cast<Node *>(&header); }
       | ^~~~~~
      

       

      Declaration as:

      QMap<QString, QString> key2filename{}
      

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            Assignee:
            thiago Thiago Macieira
            Reporter:
            alexzk_ alexzk_
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              Dates

              Created:
              Updated:
              Resolved:

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