Qt中关于undefined reference to `vtable for classname`的问题
2017-06-26 16:22
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转自：http://blog.csdn.net/qian_f/article/details/8498747
在Qt中自定义了类classname，想要使用Qt自带的信号与槽机制，所以必须要将classname继承于QObject。class classname : public QObject{ Q_OBJECTpublic: .......}修改之后保存，就出现了undefined reference to `vtable for classname`的报错。网上找了相关资料得知原因在于：因为qmake生成Makefile的时候，这个类的头文件中并没有Q_OBJECT，最终导致链接失败。解决方法：重新运行qmake（右击项目名称，点击“执行qmake”）即可。
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