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  1. Qt
  2. QTBUG-89678

Function crashes as soon as a QVariant is create with -fstack-protector on

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Out of scope
    • Affects Version/s: 6.0.0
    • Fix Version/s: None
    • Labels:
      None
    • Platform/s:
      Windows

      Description

      1. Have a Qt 6.0.0 with GCC 8.1.0 on Windows (should also work on Linux). This is a 6.0.0 regression, with Qt 5.15 it works fine.
      2. Compile the following program:
      #include <QCoreApplication>
      #include <QTimer>
      #include <QVariant>
      
      void setCursor() {
          QVariant(1);
      }
      
      int main(int argc, char *argv[])
      {
          QCoreApplication a(argc, argv);
      
          setCursor();
      
          QTimer::singleShot(0, &a, &QCoreApplication::quit);
          return a.exec();
      }
      
      QT += core
      SOURCES += main.cpp
      QMAKE_CXXFLAGS += -fstack-protector
      win32: LIBS += -lssp
      
      1. In setCursor() the program crashes. If you remove stack protection by removing the last two lines in the .pro file, the error goes away.

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              Assignee:
              thiago Thiago Macieira
              Reporter:
              szotsaki Szőts Ákos
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                Created:
                Updated:
                Resolved:

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