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::listobserver. 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::listobserver. 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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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::listobserver. 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/
