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Re: Designs for better debug info in GCC

From: Joe Buck <Joe dot Buck at synopsys dot COM>
To: Daniel Berlin <dberlin at dberlin dot org>
Cc: Alexandre Oliva <aoliva at redhat dot com>, Diego Novillo <dnovillo at google dot com>, Mark Mitchell <mark at codesourcery dot com>, Robert Dewar <dewar at adacore dot com>, Ian Lance Taylor <iant at google dot com>, Richard Guenther <richard dot guenther at gmail dot com>, gcc-patches at gcc dot gnu dot org, gcc at gcc dot gnu dot org
Date: Sun, 16 Dec 2007 17:27:35 -0800
Subject: Re: Designs for better debug info in GCC
References: <4737BF2C.70408@codesourcery.com> <or7iknzazd.fsf@oliva.athome.lsd.ic.unicamp.br> <47388599.2040701@codesourcery.com> <ory7cok8u6.fsf@oliva.athome.lsd.ic.unicamp.br> <4749DE66.1090602@codesourcery.com> <4756B02D.9010302@google.com> <ory7bv3adb.fsf@oliva.athome.lsd.ic.unicamp.br> <4aca3dc20712151903r46c9eceane35edb92d08240ac@mail.gmail.com> <oraboaero7.fsf@oliva.athome.lsd.ic.unicamp.br> <4aca3dc20712161712w1133fb96qd66be0e9a0bb1716@mail.gmail.com>

On Sun, Dec 16, 2007 at 08:12:07PM -0500, Daniel Berlin wrote:
> > It is obvious that you misunderstood what I want, and how intrusive
> > the approach is.
> >
> 
> Yes Alexandre, everyone who disagrees with you must not understand!
> That's really the problem here.
> None of us understand but you.

I have some sympathy for going in Alexandre's direction, in that it
would be nice to have a mode that provided optimization as well as
accurate debugging.  However, since preserving accurate debug information
has a cost, I think it would be better to turn -O1, not -O2, into the
mode that Alexandre wants, where debug information is preserved.  Trying
to rework all optimizations to keep perfect debug information is going
to take forever and make the compiler worse.

Follow-Ups:
- Re: Designs for better debug info in GCC
  - From: Geert Bosch
- Re: Designs for better debug info in GCC
  - From: Alexandre Oliva

References:
- Re: Designs for better debug info in GCC
  - From: Diego Novillo
- Re: Designs for better debug info in GCC
  - From: Alexandre Oliva
- Re: Designs for better debug info in GCC
  - From: Daniel Berlin
- Re: Designs for better debug info in GCC
  - From: Alexandre Oliva
- Re: Designs for better debug info in GCC
  - From: Daniel Berlin

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