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Date: Fri, 24 Aug 2012 16:57:00 -0000
From: Jan Kratochvil <jan.kratochvil@redhat.com>
To: dje@google.com
Cc: Tom Tromey <tromey@redhat.com>, gdb-patches@sourceware.org,        Eli Zaretskii <eliz@gnu.org>
Subject: Re: [patch] Implement $_version; for auto-load commands in ~/.gdbinit
Message-ID: <20120824165706.GA12430@host2.jankratochvil.net>
References: <20120821144916.GB28426@host2.jankratochvil.net> <87y5l6r8rz.fsf@fleche.redhat.com> <20120824163215.GA11323@host2.jankratochvil.net> <20120824163856.GA11598@host2.jankratochvil.net> <20535.45487.639469.141021@ruffy2.mtv.corp.google.com>
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On Fri, 24 Aug 2012 18:54:07 +0200, dje@google.com wrote:
> Jan Kratochvil writes:
>  > 	if $_have_ignore_errors
>  > 		set ignore-errors yes
>  > 		add-auto-load-safe-path ~/src
>  > 		set ignore-errors no
>  > 	end
[...]
> For my own education, why is $_have_ignore_errors needed?
> [It doesn't, for example, evaluate to 0 if it doesn't exist.]

It evaluates to void, which is false:

(gdb) p $_x
$1 = void
(gdb) ptype $_x
type = void

$ cat x
if $_x
 echo YES\n
else
 echo NO\n
end
$ gdb -q -x ./x
NO


Thanks,
Jan