Clang编译器下QVariantMap传入QML触发段错误问题

问题描述 #

将QVariantMap类型的Q_PROPERTY传入QML时触发Segmentation Fault段错误。编写简易测试程序复现问题：使用MinGW 11.2编译器时运行正常，切换到Clang 15.0.4编译器后问题出现。已通过msys2安装mingw-w64-x86_64-clang、mingw-w64-clang-x86_64-toolchain，以及mingw-w64-clang-x86_64-qt6，均未解决问题。

测试代码 #

main.cpp #

#include "TestClass.h"
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>

int main(int argc, char *argv[]) {
  QGuiApplication app(argc, argv);

  QQmlApplicationEngine engine;

  TestClass t;
  engine.rootContext()->setContextProperty("testClass", &t);

  const QUrl url(u"qrc:/QuickUI/qml/main.qml"_qs);
  QObject::connect(
      &engine, &QQmlApplicationEngine::objectCreated, &app,
      [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
          QCoreApplication::exit(-1);
      },
      Qt::QueuedConnection);
  engine.load(url);

  return app.exec();
}

TestClass.h（注：原文件命名为TestClass.cpp，实际为头文件） #

#pragma once
#include <QObject>
#include <QVariantMap>

#include <QDebug>

class TestClass : public QObject {
  Q_OBJECT
  Q_PROPERTY(QVariantMap testMap MEMBER testMap NOTIFY testMapChanged)
  Q_PROPERTY(QString testStr MEMBER testStr NOTIFY testMapChanged)

public:
  TestClass() : QObject() {}

  QVariantMap testMap;
  QString testStr = "test";

  Q_INVOKABLE void start() {
    qDebug() << "Kliknalem";
    testMap.insert("t1", "Mam 1");
    testMap.insert("t2", "Mam 2");

    emit testMapChanged();
  }

signals:
  void testMapChanged();
};

main.qml #

import QtQuick
import QtQuick.Layouts
import QtQuick.Controls

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Rectangle {
        anchors.fill: parent
        color: "#FFFFFF"
    }

    ColumnLayout {
        anchors.top: parent.top
        anchors.left: parent.left
        anchors.margins: 20
        spacing: 20

        Button {
            Layout.preferredHeight: 30
            Layout.fillWidth: true
            text: "Klik"

            onClicked: {
                testClass.start();
            }
        }

        Text {
            text: testClass.testStr
        }

        Text {
            text: testClass.testMap.t1
        }

        Text {
            text: testClass.testMap.t2
        }
    }
}

调用栈信息 #

1  QV4::ExecutionEngine::newIdentifier

2  variantMapToJS

3  QV4::ExecutionEngine::fromData

4  QV4::ExecutionEngine::fromVariant

5  loadProperty

6  QV4::Moth::VME::interpret

7  QV4::Moth::VME::exec

8  QV4::Function::call

9  QQmlJavaScriptExpression::evaluate

10 QQmlBinding::evaluate

11 QQmlNonbindingBinding::doUpdate

12 QQmlBinding::update

13 QQmlNotifier::emitNotify

14 doActivate<false>

15 TestClass::start()

16 TestClass::qt_metacall(QMetaObject::Call, int, void * *)

17 QQmlObjectOrGadget::metacall

18 CallMethod

19 CallPrecise

20 operator()

21 operator()<QV4::QObjectMethod::callInternal(const QV4::Value *, const QV4::Value *, int) const::<lambda()>>

22 QV4::QObjectMethod::callInternal

23 QV4::FunctionObject::call

24 QV4::Moth::VME::interpret

25 QV4::Moth::VME::exec

26 QV4::Function::call

27 operator()

28 QV4::convertAndCall<QV4::Function::call(QObject *, void * *, const QMetaType *, int, QV4::ExecutionContext *)::<lambda(const QV4::Value *, const QV4::Value *, int)>>

29 QV4::Function::call

30 QQmlJavaScriptExpression::evaluate

31 QQmlBoundSignalExpression::evaluate

32 QQmlBoundSignal_callback

33 QQmlNotifier::emitNotify

34 doActivate<false>

35 QMetaObject::activate

36 QQuickAbstractButton::doubleClicked

37 QQuickAbstractButtonPrivate::handleRelease

38 QQuickControl::mouseReleaseEvent

39 QQuickItem::event

40 QCoreApplication::notifyInternal2

41 QCoreApplication::sendEvent

42 QQuickDeliveryAgentPrivate::deliverMatchingPointsToItem

43 QQuickDeliveryAgentPrivate::deliverUpdatedPoints

44 QQuickDeliveryAgentPrivate::deliverPointerEvent

45 QQuickDeliveryAgentPrivate::handleMouseEvent

46 QQuickDeliveryAgent::event

47 QQuickWindow::event

48 QCoreApplication::notifyInternal2

49 QCoreApplication::sendSpontaneousEvent

50 QGuiApplicationPrivate::processMouseEvent

51 QWindowSystemInterface::sendWindowSystemEvents

52 QEventDispatcherWin32::processEvents

53 QWindowsGuiEventDispatcher::processEvents

54 QEventLoop::processEvents

55 QEventLoop::exec

56 QCoreApplication::exec

57 qMain(int, char * *)

58 WinMain

59 main

60 __tmainCRTStartup

61 WinMainCRTStartup      

内容的提问来源于stack exchange，提问作者ducho