cstdef:No such file or directory

b108463

Hi all,
I am a new user for Qt and Nvidia TK1. Currently, I try to build a code on ubuntu of PC, but I suffer some problems. Is anyone able to give me some suggestions? Thanks a lot.

the toolchain is /usr/bin/g++-4.8 of ubuntu
2.the Qt version is 5.7.0
the error message is listed as below,
In file included from /opt/Qt5.7.0/5.7/gcc_64/include/QtGui/qwindowdefs.h:43:0,
from /opt/Qt5.7.0/5.7/gcc_64/include/QtWidgets/qwidget.h:43,
from /opt/Qt5.7.0/5.7/gcc_64/include/QtWidgets/qmainwindow.h:43,
from /opt/Qt5.7.0/5.7/gcc_64/include/QtWidgets/QMainWindow:1,
from SMPCodeReader/mainwindow.h:4,
from SMPCodeReader/main.cpp:1:
/opt/Qt5.7.0/5.7/gcc_64/include/QtCore/qglobal.h:45:21: fatal error: cstddef: No such file or directory

include <cstddef>

compilation terminated.
make: *** [main.o] Error 1

b108463

hi all,
Thanks for your reply. I think it is a problem in my ubuntu.
Maybe I made a mistake, so I could not see any of the header files in /use/include.
After I reinstalling the ubuntu , It is ok. Thanks a lot. :)

m.sue

Hi,
there is probably something wrong with your installation of gcc. Usually the include files are not under "/opt". BTW: which Ubuntu do you speak of? 14.04 LTS? I build Qt 5.7.0 there quite some time ago and did not have any such problem.
I would look if "cstddef" really is not in gcc's include directories. You could create yourself a link to "stddef.h" and try again. But there maybe other problems to come with other includes.
-Michael.

b108463

@m.sue Thanks.

I tyr the example file of Qt5.7, I see the same problem. :(
I use ubuntu-14.04.5-desktop-amd64.iso to install my ubuntu.

kshegunov

@b108463
Did you install the dev packages, e.g. http://packages.ubuntu.com/precise/libc6-dev?

b108463

hi all,
Thanks for your reply. I think it is a problem in my ubuntu.
Maybe I made a mistake, so I could not see any of the header files in /use/include.
After I reinstalling the ubuntu , It is ok. Thanks a lot. :)