Your message dated Wed, 24 Oct 2007 09:56:15 -0700
with message-id <[EMAIL PROTECTED]>
and subject line Bug#445685: Acknowledgement (Random uncatchable exceptions)
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--- Begin Message ---
Package: g++-4.2
Version: 4.2.1-6
Severity: normal
g++ seems to ignore exception handlers in unpredictable ways. I've
attached a minimal program that illustrates what's been happening to me.
It aborts with an uncaught exception ("terminate called after throwing
an instance of 'exception'"). But if you comment out either the line
instantiating a class that crashes in its destructor, or the line that
explicitly throws an exception, the exception is caught as expected.
Daniel
-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.22-2-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages g++-4.2 depends on:
ii gcc-4.2 4.2.1-6The GNU C compiler
ii gcc-4.2-base 4.2.1-6The GNU Compiler Collection (base
ii libc6 2.6.1-5GNU C Library: Shared libraries
ii libstdc++6-4.2-dev4.2.1-6The GNU Standard C++ Library v3 (d
g++-4.2 recommends no packages.
-- no debconf information
#include
class exception
{
};
class crash_in_destructor
{
public:
~crash_in_destructor()
{
exception tmp;
throw tmp;
}
};
int main(int argc, char **argv)
{
try
{
crash_in_destructor tmp;
exception tmp2;
throw tmp2;
}
catch(exception)
{
std::cout << "PASS" << std::endl;
return 0;
}
std::cout << "FAIL" << std::endl;
return -1;
}
--- End Message ---
--- Begin Message ---
On Sat, Oct 20, 2007 at 08:55:17AM +0200, Martin Michlmayr <[EMAIL PROTECTED]>
was heard to say:
> * Daniel Burrows <[EMAIL PROTECTED]> [2007-10-07 15:10]:
> > On further thought, it occurs to me that throwing an exception in a
> > destructor is a fundamentally nasty thing to do. That may be the
> > root cause of the problem I ran into.
>
> So do you want us to forward this issue to the GCC people or do you
> think it's simply user error?
I think it's user stupidity -- reading around a little, it appears
that throwing from destructors is defined to lead to instant termination
in certain cases.
Daniel
--- End Message ---
