【学QT】 3

1、 

[root@localhost helloqt]# make
g++ -Wl,-rpath,/usr/local/qt/lib -o cfconv .obj/main.o .obj/cfconvmainform.o .obj/moc_cfconvmainform.o   -L/usr/local/qt/lib -L/usr/X11R6/lib -lqt-mt -lXext -lX11 -lm
.obj/moc_cfconvmainform.o:(.rodata._ZTV14cfconvMainform[vtable for cfconvMainform]+0x11c): undefined reference to `QWidget::graphicsContext(bool) const'
.obj/moc_cfconvmainform.o:(.rodata._ZTV14cfconvMainform[vtable for cfconvMainform]+0x188): undefined reference to `QWidget::qwsEvent(QWSEvent*)'
.obj/moc_cfconvmainform.o:(.rodata._ZTV14cfconvMainform[vtable for cfconvMainform]+0x18c): undefined reference to `QWidget::scanLine(int) const'
.obj/moc_cfconvmainform.o:(.rodata._ZTV14cfconvMainform[vtable for cfconvMainform]+0x190): undefined reference to `QWidget::bytesPerLine() const'
.obj/moc_cfconvmainform.o:(.rodata._ZTV14cfconvMainform[vtable for cfconvMainform]+0x1fc): undefined reference to `non-virtual thunk to QWidget::scanLine(int) const'
.obj/moc_cfconvmainform.o:(.rodata._ZTV14cfconvMainform[vtable for cfconvMainform]+0x200): undefined reference to `non-virtual thunk to QWidget::bytesPerLine() const'
.obj/moc_cfconvmainform.o:(.rodata._ZTV14cfconvMainform[vtable for cfconvMainform]+0x204): undefined reference to `non-virtual thunk to QWidget::graphicsContext(bool) const'
collect2: ld 返回 1
make: *** [cfconv] 错误 1

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DEBUG:

原因在于 之前 在配置错误情况下生产的 .obj 文件依旧存在， 再次make 时出错， 删除  编译产生的文件即可。

rm -rf   `ls -a  ./ | egrep -v "(.cpp$|.h$|.ui$|.pro$)"`

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