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Date: Thu, 04 Sep 2008 10:53:00 -0000
From: Robert Dewar <dewar@adacore.com>
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To: Andreas Schwab <schwab@suse.de>
CC: Eli Zaretskii <eliz@gnu.org>, "Frank Ch. Eigler" <fche@redhat.com>,   msnyder@vmware.com, brobecker@adacore.com, jreiver@free.fr,   gdb@sourceware.org
Subject: Re: how to examine data with compiler optimization option set?
References: <1220390777.48bdaf79617dd@imp.free.fr>	<48BDB1B0.4040703@adacore.com> <1220391632.48bdb2d04bfd7@imp.free.fr>	<48BDB4E2.9010301@adacore.com> <20080902215623.GA3779@adacore.com>	<48BDD4B7.5060503@vmware.com> <y0mljyaudzb.fsf@ton.toronto.redhat.com>	<umyip6pvb.fsf@gnu.org> <48BF04C6.8030108@adacore.com> <jeabeos5le.fsf@sykes.suse.de>
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Andreas Schwab wrote:
> Robert Dewar <dewar@adacore.com> writes:
> 
>> Well you always had local variables disappearing in earlier versions
>> but enough worked so you could debug, in particular parameters were
>> always available and reliable.
> 
> If parameters are passed in registers they are very likely to get lost.
> Even on i386 parameters sometimes get passed in registers, eg. when
> calling local functions.

Yes, indeed parameters do get lost and I find it impossible in
practice to debug at -O1 (whereas this was ny normal practice
for many years).

What I am saying is that if an effort is put in to improve
the debugging information, for me this would be the primary
target.
> 
> Andreas.
>