Qt5未定义引用`QDeclarativeDebuggingEnabler :: QDeclarativeDebuggingEnabler（）＆＃39;

Question

突然出现了这个问题...

classitem.o: In function `__static_initialization_and_destruction_0':
/../../Qt/5.4/gcc_64/include/QtDeclarative/qdeclarativedebug.h:50: undefined reference to `QDeclarativeDebuggingEnabler::QDeclarativeDebuggingEnabler()'
collect2: error: ld returned 1 exit status
make: *** [MedJournal] Error 1
09:29:05: The process "/usr/bin/make" exited with code 2.

甚至从对象中剥离QObject类，但仍然遇到了同样的错误。

Answer 1

事实证明，由于某种原因，这条线路造成了所有麻烦：

#include <QtDeclarative/QDeclarativeView>

Answer 2

请记住启用调试时QtQuick1和QtQuick2之间存在差异：

QtQuick1

#include <QtDeclarative/qdeclarativedebug.h>
QDeclarativeDebuggingEnabler enabler;

QtQuick2

#include <QQmlDebuggingEnabler>
QQmlDebuggingEnabler enabler;

因为你使用的是Qt5.4，QtQuick2是自Qt5以来我认为，这可能是问题所在。