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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: GDB - El Capitan
Date: Sat, 17 Oct 2015 08:38:55 +0100
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Date: 2015-10-17T08:38:55+01:00
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Simon Wright <simon@pushface.org> writes:

> Has anyone managed to get the AdaCore GDB to catch exceptions on El
> Capitan?
>
> The problem I reported back in 2011 at [1] is still there. The 'p
> __gnat_debug_raise_exception' trick no longer works; the '-readnow'
> trick at least lets you say 'catch exception', but if you try to catch a
> specific exception it then reports
>
>    (gdb) catch exception constraint_error
>    warning: failed to reevaluate internal exception condition for
>    catchpoint 0: A syntax error in expression, near `e) = long_integer
>    (&standard.constraint_error)'.  Catchpoint 1: `constraint_error' Ada
>    exception
>
> and stops on all exceptions (I think it actually gets hung up, so 'c'
> ends up at the same place).
>
> At least this time it fails in the same way with GNAT GDB 2015, so we
> *may* get a hint from AdaCore.
>
> [1] https://sourceware.org/bugzilla/show_bug.cgi?id=11385

Aha!

The workround is to use the '-readnow' flag and to 'set language ada'
before 'catch exception'.

I guess that if you're debugging a mixed-language program you could then
'set language auto' ... hmm, no. Still, I'm saved from Put_Line's all
over the place!