QT5使用QPrinter QPrintDialog报错

错误信息：

undefined reference to `_imp___ZN8QPrinterC1ENS_11PrinterModeE

undefined reference to `_imp___ZN12QPrintDialogC1EP8QPrinterP7QWidget

undefined reference to `_imp___ZN20QAbstractPrintDialog16addEnabledOptionENS_17PrintDialogOptionE

undefined reference to `_imp___ZN12QPrintDialog4execEv

undefined reference to `_imp___ZN12QPrintDialogD1Ev

undefined reference to `_imp___ZN8QPrinterD1Ev

undefined reference to `_imp___ZN12QPrintDialogD1Ev

undefined reference to `_imp___ZN8QPrinterD1Ev

出错原因：

Qt 5中将所有打印的相关类都放到了Qt Print Support模块中

解决办法：

在.pro文件中添加代码：qtHaveModule(printsupport): QT += printsupport