Can't "catch exception" in gdb on OS X

Can't "catch exception" in gdb on OS X

[Jerry]

I'm on OS X 10.9.5 trying to debug a GNAT program. When I type

   catch exception

when the program is in the debugger but paused at the automatically inserted breakpoint at the first line, I get this:

    Cannot insert Ada exception catchpoints in this configuration.

gdb reports this:

    GNU gdb (GDB) 7.7 for GNAT GPL 2014 (20140405)
      .
      .
      .
    This GDB was configured as "x86_64-apple-darwin12.5.0".

Also (curse the line wraps),

(gdb) show configuration
This GDB was configured as follows:
   configure --host=x86_64-apple-darwin12.5.0 --target=x86_64-apple-darwin12.5.0
             --with-auto-load-dir=:${prefix}/share/auto-load
             --with-auto-load-safe-path=:${prefix}/share/auto-load
             --with-expat
             --with-gdb-datadir=/gnatmail/sandbox/gpl-2014/x86_64-darwin/gdb/pkg/share/gdb-7.7 (relocatable)
             --with-jit-reader-dir=/gnatmail/sandbox/gpl-2014/x86_64-darwin/gdb/pkg/lib/gdb (relocatable)
             --without-libunwind-ia64
             --without-lzma
             --with-python=/gnatmail/sandbox/gpl-2014/x86_64-darwin/gdb/pkg/share/gdb-7.7/python-2.7.3 (relocatable)
             --with-separate-debug-dir=/usr/lib/debug
             --without-zlib
             --without-babeltrace


Ideas?
Jerry

Re: Can't "catch exception" in gdb on OS X

[Simon Wright]

Jerry <lanceboyle@qwest.net> writes:

> I'm on OS X 10.9.5 trying to debug a GNAT program. When I type
>
>    catch exception
>
> when the program is in the debugger but paused at the automatically
> inserted breakpoint at the first line, I get this:
>
>     Cannot insert Ada exception catchpoints in this configuration.

I wrote about this at [1]; there's a GDB Bugzilla entry about it[2].

The simplest solution I've found is to invoke gdb with -readnow.

[1] http://forward-in-code.blogspot.co.uk/2012/01/catching-exceptions-in-gdb.html
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=11385

Re: Can't "catch exception" in gdb on OS X

[Jerry]

On Saturday, March 5, 2016 at 1:30:44 AM UTC-7, Simon Wright wrote:
> Jerry writes:
> 
> > I'm on OS X 10.9.5 trying to debug a GNAT program. When I type
> >
> >    catch exception
> >
> > when the program is in the debugger but paused at the automatically
> > inserted breakpoint at the first line, I get this:
> >
> >     Cannot insert Ada exception catchpoints in this configuration.
> 
> I wrote about this at [1]; there's a GDB Bugzilla entry about it[2].
> 
> The simplest solution I've found is to invoke gdb with -readnow.
> 
> [1] http://forward-in-code.blogspot.co.uk/2012/01/catching-exceptions-in-gdb.html
> [2] https://sourceware.org/bugzilla/show_bug.cgi?id=11385

Thanks, Simon. Google didn't point me to your blog because I entered the current gdb error text and it looks like the text has changed since you wrote.

Your suggestions including using -readnow in the gdb call and first telling gdb to "break __gnat_debug_raise_exception" work on GNAT GPL 2015 but not GPL 2014 on my machine running OS X 10.9.5. I also have FSF gcc-4.9.1 installed but it isn't codesigned and I didn't bother with trying it. If this would be useful feedback I will do that (codesign, reboot).

For GPL 2015, behavior was the same whether or not I used -readnow. In both cases, I had to first "start" before having "catch exception" recognized.

Jerry

Re: Can't "catch exception" in gdb on OS X

[Simon Wright]

Jerry <lanceboyle@qwest.net> writes:

> On Saturday, March 5, 2016 at 1:30:44 AM UTC-7, Simon Wright wrote:
>> Jerry writes:
>> 
>> > I'm on OS X 10.9.5 trying to debug a GNAT program. When I type
>> >
>> >    catch exception
>> >
>> > when the program is in the debugger but paused at the automatically
>> > inserted breakpoint at the first line, I get this:
>> >
>> >     Cannot insert Ada exception catchpoints in this configuration.
>> 
>> I wrote about this at [1]; there's a GDB Bugzilla entry about it[2].
>> 
>> The simplest solution I've found is to invoke gdb with -readnow.
>> 
>> [1]
>> http://forward-in-code.blogspot.co.uk/2012/01/catching-exceptions-in-gdb.html
>> [2] https://sourceware.org/bugzilla/show_bug.cgi?id=11385
>
> Thanks, Simon. Google didn't point me to your blog because I entered
> the current gdb error text and it looks like the text has changed
> since you wrote.
>
> Your suggestions including using -readnow in the gdb call and first
> telling gdb to "break __gnat_debug_raise_exception" work on GNAT GPL
> 2015 but not GPL 2014 on my machine running OS X 10.9.5. I also have
> FSF gcc-4.9.1 installed but it isn't codesigned and I didn't bother
> with trying it. If this would be useful feedback I will do that
> (codesign, reboot).
>
> For GPL 2015, behavior was the same whether or not I used -readnow. In
> both cases, I had to first "start" before having "catch exception"
> recognized.

I'm running 10.11.3 (El Capitan), which requires -readnow (or maybe the
break?) for both GNAT GPL 2015 and FSF GCC 5.2.0. I certainly don't have
to 'start'!

I can't investigate for earlier OS releases, sorry.

I don't think codesigning makes any difference to whether 'catch
exception' is accepted.