[Qt-interest] Segmentation Fault when Program Starts

[Konrad Rosenbaum]

Hi,

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On Friday 04 September 2009, Karl Ruetz wrote:
>  I am having a difficulty where any program I compile that contains a QT
> object produces a Segmentation Fault on a similar system that does not
> have the QT development environment installed.
>
>  QT Version:  4.5.2 -static -release

Are you sure it is static? Do a ldd on it.

Even static (Qt) programs use some parts dynamically. A ldd output from both 
systems would be really helpful.

I describe how to deliver dynamically linked Qt programs here:
http://silmor.de/30

>  I built two simple programs:
>
>  Here is the listing for Program 1 (No QT Objects):
>  #include <stdio.h>
>  int main()
>  {
>      fprintf(stderr, "Program running.\n");
>      return 0;
>  }

Ok, no surprise here.

>  Here is the listing for Program 2:
>  #include <QDebug>
>  int main()
>  {
>      qDebug("Program running.");
>      return 0;
>  }

I really wonder why this runs on one of the systems. There is no 
QApplication object, but then again qDebug in this form is little more than 
printf.

>  Both programs compile.  Both run on the system where they were built. 
> On an RHEL 5 system where QT has not been installed, here is the output
> (the user is root):

Why are you running anything as root?

>  # ./QTTest
>  Program running.
>  # ./QTTest2
>  Segmentation fault

Compile it again as debug version.

Set "ulimit -c unlimited", run it again and then analyse the core file with 
gdb. Where does it crash?

>  If figure I'm missing something simple. 
>  I would appreciate any input.

Probably, without more diagnosis it is hard to say what this is.



	Konrad
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