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  1. Qt
  2. QTBUG-89675

Functions using QSettings crash with -fstack-protector on

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: P1: Critical P1: Critical
    • None
    • 6.0.0
    • Core: Other
    • None
    • Windows

      1. Have a Qt 6.0.0 with GCC 8.1.0 on Windows (I haven't tried it on Linux but should work).
      2. Compile the following program:
      #include <QCoreApplication>
      #include <QSettings>
      #include <QTimer>
      
      int readSettings() {
          QSettings settings;
          return settings.value(QStringLiteral("Settings/Temp"), 1).toInt();
      }
      
      int main(int argc, char *argv[]) {
          QCoreApplication a(argc, argv);
          QCoreApplication::setApplicationName(QStringLiteral("AppName"));
          QCoreApplication::setOrganizationName(QStringLiteral("OrgName"));
          QCoreApplication::setOrganizationDomain(QStringLiteral("www.org.org"));
          QCoreApplication::setApplicationVersion(QStringLiteral("1.0"));
      
          volatile int i = readSettings();
      
          QTimer::singleShot(0, &a, &QCoreApplication::quit);
          return a.exec();
      } 
      QT -= gui
      CONFIG += c++11 console
      CONFIG -= app_bundle
      SOURCES += main.cpp
      QMAKE_CXXFLAGS += -fstack-protector
      win32: LIBS += -lssp 
      1. Observe that in readSettings 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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            thiago Thiago Macieira
            szotsaki Szőts Ákos
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              Created:
              Updated:
              Resolved:

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