gdb aborts after setting "throw" catchpoint

gdb aborts after setting "throw" catchpoint

[Ryan Johnson]

Hi all,

Compiling the following with the cygwin g++-4.5.3:

int global;
int main() {
     if (global)
         throw global;
     return 0;
}

Crashes gdb if a catchpoint is set:

GNU gdb (GDB) 7.6.50.20130408-cvs (cygwin-special)
... snip...
Reading symbols from /home/Ryan/experiments/a.exe...done.
(gdb) catch throw
Catchpoint 1 (throw)
(gdb) r
Starting program: /home/Ryan/experiments/a.exe
[New Thread 10024.0x1480]
[New Thread 10024.0x1758]
warning: SuspendThread failed. (winerr 6)
[Inferior 1 (process 10024) exited normally]
(gdb)
Debugger aborted (core dumped)

Has anybody seen this problem before? Meanwhile, setting a breakpoint on 
__cxa_throw works just fine, so at least there's a workaround.

Thoughts?
Ryan


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Re: gdb aborts after setting "throw" catchpoint

[Noel Grandin]

On 2013-05-29 23:23, Ryan Johnson wrote:
>
> GNU gdb (GDB) 7.6.50.20130408-cvs (cygwin-special)
> ... snip...
> Reading symbols from /home/Ryan/experiments/a.exe...done.
> (gdb) catch throw
> Catchpoint 1 (throw)


That was a mistake in the documentation, they didn't actually get around 
to implementing it.
They have since rectified that mistake, but it's only going to be in 
version 7.7

See bug:
http://sourceware.org/bugzilla/show_bug.cgi?id=13588

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Re: gdb aborts after setting "throw" catchpoint

[Ryan Johnson]

On 30/05/2013 2:37 AM, Noel Grandin wrote:
> On 2013-05-29 23:23, Ryan Johnson wrote:
>>
>> GNU gdb (GDB) 7.6.50.20130408-cvs (cygwin-special)
>> ... snip...
>> Reading symbols from /home/Ryan/experiments/a.exe...done.
>> (gdb) catch throw
>> Catchpoint 1 (throw)
>
>
> That was a mistake in the documentation, they didn't actually get 
> around to implementing it.
> They have since rectified that mistake, but it's only going to be in 
> version 7.7
>
> See bug:
> http://sourceware.org/bugzilla/show_bug.cgi?id=13588
That bug seems to be about adding filtering based on exception type, not 
about supporting catchpoints in general; the latter have worked for 
years in gdb-linux (at a minimum, my server at work can do it with 
gdb-7.4).

The problem here is that gdb-cygwin crashes when running with a 
catchpoint enabled. I don't see any bugs on Sourceware about that, 
though I suspect the search interface is terrible so I could be missing 
something obvious.

Ryan


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