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RE: Bug in g++: Testcase exits with segmentation fault
- From: Igor Pechtchanski <pechtcha at cs dot nyu dot edu>
- To: Chris January <chris at atomice dot net>
- Cc: Boris Schaeling <boriss at web dot de>, <cygwin at cygwin dot com>
- Date: Tue, 14 Jan 2003 13:06:07 -0500 (EST)
- Subject: RE: Bug in g++: Testcase exits with segmentation fault
- Reply-to: cygwin at cygwin dot com
On Tue, 14 Jan 2003, Chris January wrote:
> > The testcase attached to this mail compiled with g++ 2.95.3-10 or g++ 3.2
> > 20020927 under Cygwin 1.3.18 exits with segmentation fault. It seems to be
> > an error in g++ as the testcase doesn't work under Linux either.
> > Can anyone help or do I have to report this error to the GCC website?
> >
> > BTW I found two ways to make the testcase work:
> > 1) Change line 64 (and 70 respectively) and use "observer
> > *Observer" instead
> > of "std::list<observer>". I compiled the testcase with STLport-4.5.3 under
> > Linux to see if it's a bug in the Standard Library but got again
> > segmentation fault.
> > 2) Remove line 75 which is a simple "poll(NULL, 0, 2000)". It
> > works without
> > this line but I don't know why.
>
> The bug is actually in your testcase.
> The line:
> Observers.push_back(observer());
> creates a temporary observer object. So when the line
> observer::observer() { Select.give(this); }
> calls give(), it leaves a dangling pointer.
>
> Chris
True, but not the issue here. Even buggy programs shouldn't *crash* the
compiler. Just my 2c.
Igor
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