Bug in g++: Testcase exits with segmentation fault
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". 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. Boris testcase.cpp Description: Binary data -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Bug in g++: Testcase exits with segmentation fault
When a program crashes crashes on cygwin - also crashes in the same way on a platform other then cygwin - its quite obviously not a cygwin problem and therefore the original author of said software should be contacted. In this case you do indeed have to report this error to the gcc website. Given its a g++ bug, theres some likelihood of it having been fixed in gcc 3.4 (experimental) - but it will be a while before you see that distributed in cygwin (or as part of a stable linux distribution) I expect. Gareth - Original Message - From: "Boris Schaeling" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, January 14, 2003 2:13 AM Subject: Bug in g++: Testcase exits with segmentation fault > 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". 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. > > Boris > > -- > Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple > Bug reporting: http://cygwin.com/bugs.html > Documentation: http://cygwin.com/docs.html > FAQ: http://cygwin.com/faq/ -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
RE: Bug in g++: Testcase exits with segmentation fault
> 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". 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
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RE: Bug in g++: Testcase exits with segmentation fault
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Chris
> January
> Sent: Tuesday, January 14, 2003 6:01 PM
> To: Boris Schaeling
> Cc: [EMAIL PROTECTED]
> Subject: RE: Bug in g++: Testcase exits with segmentation fault
> [...]
> 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.
Oh, you are right. I've forgotten to use a smart pointer ... thanks for your
feedback!
Boris
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RE: Bug in g++: Testcase exits with segmentation fault
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". 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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