From: Jakub Jelinek <jakub@redhat.com>
To: Gabriel Dos Reis <gdr@integrable-solutions.net>
Cc: Eric Botcazou <ebotcazou@adacore.com>,
Bernd Schmidt <bernds@codesourcery.com>,
gcc@gcc.gnu.org, Miles Bader <miles@gnu.org>,
Torvald Riegel <triegel@redhat.com>,
Xinliang David Li <davidxl@google.com>,
Richard Guenther <richard.guenther@gmail.com>,
David Edelsohn <dje.gcc@gmail.com>,
Diego Novillo <dnovillo@google.com>
Subject: Re: Switching to C++ by default in 4.8
Date: Wed, 11 Apr 2012 07:51:00 -0000 [thread overview]
Message-ID: <20120411075031.GZ16117@tyan-ft48-01.lab.bos.redhat.com> (raw)
In-Reply-To: <CAAiZkiACyjN=ouATxiwonOq8ZPaML8NuBcwCVgaS5FnC+pL=ig@mail.gmail.com>
On Wed, Apr 11, 2012 at 02:45:55AM -0500, Gabriel Dos Reis wrote:
> On Wed, Apr 11, 2012 at 2:01 AM, Jakub Jelinek <jakub@redhat.com> wrote:
> > On Wed, Apr 11, 2012 at 01:27:29AM +0200, Eric Botcazou wrote:
> >> > In the short term, a partial conversion to C++ gains us nothing. Even
> >> > ignoring the bugs inevitably caused by any such project, we'll end up
> >> > with a strange mish-mash of styles for a very long time, which instead
> >> > of helping anyone can only lead to confusion. I don't see anyone
> >> > committing to invest the time in converting even an entire subsystem let
> >> > alone the whole compiler. Maybe a subsystem conversion would be a good
> >> > thing to try on a branch and then present the results to the community
> >> > for evaluation. This would be better than lowering the barrier now for
> >> > all sorts of random but uncoordinated conversion efforts.
> >>
> >> IMO the killer conversion would be vec.[ch], which is a very clever piece of
> >> code but is almost impossible to use without copy-and-pasting existing cases.
> >> I think that a proper C++ implementation would be a very convincing argument.
> >
> > But IMHO not sufficient for a switch. Â The GCC C++ proponents should do more
> > on a branch to convince. Â Yes, the syntactic suger for vec.h isn't very
> > nice, but the actual implementation is very clever and heavily tuned for
> > GCC's needs; if we convert to C++ just because of vec.[ch], we open
> > ourselves to what is being discussed in this thread, people who would like
> > to turn GCC codebase into yet another LLVM, which not everybody finds
> > actually very readable and maintainable code, would start doing so.
>
> I have been having difficulty following the twists and the turns and
> the goal post moving.
> Are you essentially requiring to see GCC rewritten in C++ before we
> switch to C++?
No, but I'd like to see more than just vec.[ch] conversion alone and see what
benefits it actually brings to GCC if any with real numbers of what it means
to compile time, compilation memory usage, etc.
Jakub
next prev parent reply other threads:[~2012-04-11 7:51 UTC|newest]
Thread overview: 182+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-03 17:38 Diego Novillo
2012-04-03 19:39 ` Paweł Sikora
2012-04-03 20:52 ` Ian Lance Taylor
2012-04-03 21:34 ` Paweł Sikora
2012-04-20 20:14 ` Joseph S. Myers
2012-04-04 5:19 ` Basile Starynkevitch
2012-04-04 1:13 ` David Edelsohn
2012-04-04 4:00 ` Ian Lance Taylor
2012-04-04 4:42 ` Miles Bader
2012-04-04 8:32 ` Gabriel Dos Reis
2012-04-04 9:06 ` Richard Guenther
2012-04-04 9:10 ` Gabriel Dos Reis
2012-04-04 9:15 ` Gabriel Dos Reis
2012-04-04 9:59 ` Richard Guenther
2012-04-04 10:02 ` Richard Guenther
2012-04-04 11:20 ` Diego Novillo
2012-04-04 11:38 ` Richard Guenther
2012-04-04 14:12 ` Tom Tromey
2012-04-04 14:45 ` Richard Guenther
2012-04-04 14:48 ` Richard Guenther
2012-04-14 1:35 ` Chiheng Xu
2012-04-14 9:09 ` Robert Dewar
2012-04-14 10:03 ` Chiheng Xu
2012-04-14 11:13 ` Robert Dewar
2012-04-14 11:41 ` Jonathan Wakely
2012-04-14 10:39 ` Gabriel Dos Reis
2012-04-14 11:08 ` Robert Dewar
2012-04-16 9:37 ` Chiheng Xu
2012-04-16 9:38 ` Jonathan Wakely
2012-04-17 9:11 ` Robert Dewar
2012-04-05 12:40 ` Pedro Lamarão
2012-04-05 13:05 ` Richard Guenther
2012-04-05 14:21 ` Diego Novillo
2012-04-05 14:24 ` Richard Guenther
2012-04-05 14:36 ` Diego Novillo
2012-04-05 20:17 ` David Edelsohn
2012-04-05 20:36 ` Gabriel Dos Reis
2012-04-06 0:11 ` David Edelsohn
2012-04-09 10:37 ` Richard Guenther
2012-04-09 15:07 ` David Edelsohn
2012-04-10 22:04 ` Pedro Lamarão
2012-04-10 22:56 ` Diego Novillo
2012-04-04 11:53 ` Bernd Schmidt
2012-04-04 12:04 ` Richard Guenther
2012-04-04 14:59 ` Diego Novillo
2012-04-04 17:54 ` Lawrence Crowl
2012-04-05 9:18 ` Richard Guenther
2012-04-05 20:07 ` Lawrence Crowl
2012-04-09 10:40 ` Richard Guenther
2012-04-09 17:56 ` Lawrence Crowl
2012-04-09 18:22 ` Jakub Jelinek
2012-04-09 18:52 ` Lawrence Crowl
2012-04-09 18:54 ` Jakub Jelinek
2012-04-09 21:15 ` Lawrence Crowl
2012-04-10 11:09 ` Richard Guenther
2012-04-11 1:36 ` Lawrence Crowl
2012-04-11 6:55 ` Jakub Jelinek
2012-04-13 23:26 ` Dave Korn
2012-04-11 9:32 ` Richard Guenther
2012-04-14 3:07 ` Chiheng Xu
2012-04-14 3:04 ` Chiheng Xu
2012-04-14 21:25 ` Lawrence Crowl
2012-04-09 23:34 ` Xinliang David Li
2012-04-10 8:46 ` Jakub Jelinek
2012-04-10 12:26 ` Michael Matz
2012-04-10 15:51 ` David Edelsohn
2012-04-10 16:05 ` Gabriel Dos Reis
2012-04-10 16:13 ` Diego Novillo
2012-04-11 9:17 ` Richard Guenther
2012-04-11 16:35 ` Xinliang David Li
2012-04-10 16:12 ` Xinliang David Li
2012-04-10 16:24 ` Michael Matz
2012-04-10 17:08 ` Xinliang David Li
2012-04-10 17:29 ` Torvald Riegel
2012-04-10 18:00 ` Eric Botcazou
2012-04-10 19:56 ` Torvald Riegel
2012-04-10 21:13 ` Eric Botcazou
2012-04-10 21:29 ` Torvald Riegel
2012-04-10 23:15 ` Eric Botcazou
2012-04-11 20:57 ` Torvald Riegel
2012-04-11 21:15 ` Eric Botcazou
2012-04-11 21:43 ` Torvald Riegel
2012-04-13 23:33 ` Dave Korn
2012-04-11 9:24 ` Richard Guenther
2012-04-11 12:58 ` Torvald Riegel
2012-04-11 13:13 ` Richard Guenther
2012-04-11 13:23 ` Gabriel Dos Reis
2012-04-11 14:19 ` Torvald Riegel
2012-04-11 17:24 ` Xinliang David Li
2012-04-11 18:17 ` Andrew Pinski
2012-04-11 20:02 ` Xinliang David Li
2012-04-12 5:08 ` Ian Lance Taylor
2012-04-12 6:12 ` Miles Bader
2012-04-12 6:22 ` James Dennett
2012-04-11 18:26 ` Jonathan Wakely
2012-04-11 18:41 ` Pedro Alves
2012-04-11 20:00 ` Xinliang David Li
2012-04-11 20:05 ` Jonathan Wakely
2012-04-12 5:10 ` Ian Lance Taylor
[not found] ` <12130397.ZsTVnyYbKR@pawels>
2012-04-11 13:14 ` Richard Guenther
2012-04-11 13:24 ` Bernd Schmidt
2012-04-11 17:31 ` Xinliang David Li
2012-04-11 18:37 ` Basile Starynkevitch
2012-04-11 18:52 ` Gabriel Dos Reis
2012-04-11 20:14 ` Xinliang David Li
2012-04-12 15:51 ` Ludovic Courtès
2012-04-13 23:45 ` Dave Korn
2012-04-11 14:41 ` Jonathan Wakely
2012-04-11 17:13 ` Xinliang David Li
2012-04-11 19:30 ` Tobias Burnus
2012-04-11 20:44 ` Torvald Riegel
2012-04-13 23:48 ` Dave Korn
2012-04-13 23:37 ` Dave Korn
2012-04-10 17:48 ` DJ Delorie
2012-04-10 19:21 ` Dave Korn
2012-04-10 16:23 ` Xinliang David Li
2012-04-10 16:39 ` Jakub Jelinek
2012-04-10 16:43 ` Gabriel Dos Reis
2012-04-10 16:47 ` Diego Novillo
2012-04-12 19:40 ` Tom Tromey
2012-04-12 19:42 ` Diego Novillo
2012-04-12 19:51 ` Tom Tromey
2012-04-10 17:37 ` Torvald Riegel
2012-04-10 21:39 ` Miles Bader
2012-04-10 22:32 ` Bernd Schmidt
2012-04-10 23:28 ` Eric Botcazou
2012-04-10 23:35 ` Gabriel Dos Reis
2012-04-11 7:49 ` Eric Botcazou
2012-04-11 7:55 ` Gabriel Dos Reis
2012-04-11 8:11 ` Eric Botcazou
2012-04-11 11:41 ` Jeff Law
2012-04-11 7:02 ` Jakub Jelinek
2012-04-11 7:46 ` Gabriel Dos Reis
2012-04-11 7:51 ` Jakub Jelinek [this message]
2012-04-11 12:37 ` Bernd Schmidt
2012-04-11 12:47 ` Richard Guenther
2012-04-11 17:10 ` Xinliang David Li
2012-04-11 13:20 ` Gabriel Dos Reis
2012-04-11 13:29 ` Jakub Jelinek
2012-04-11 13:44 ` Gabriel Dos Reis
2012-04-11 14:45 ` David Edelsohn
2012-04-11 17:41 ` Xinliang David Li
2012-04-11 17:08 ` Xinliang David Li
2012-04-11 8:07 ` Eric Botcazou
2012-04-11 9:45 ` Richard Guenther
2012-04-10 17:54 ` Xinliang David Li
2012-04-11 12:44 ` Marek Polacek
2012-04-11 16:49 ` Xinliang David Li
2012-04-11 2:24 ` Lawrence Crowl
2012-04-11 9:43 ` Richard Guenther
2012-04-11 16:47 ` Xinliang David Li
2012-04-11 20:48 ` Paweł Sikora
2012-04-11 22:34 ` Lawrence Crowl
2012-04-12 9:28 ` Chiheng Xu
2012-04-12 10:30 ` Richard Guenther
2012-04-14 1:15 ` Chiheng Xu
2012-04-14 6:30 ` Chiheng Xu
2012-04-14 9:08 ` Robert Dewar
2012-04-14 10:38 ` Chiheng Xu
2012-04-14 11:06 ` Robert Dewar
2012-04-10 16:42 ` Paweł Sikora
2012-04-10 19:23 ` Dave Korn
2012-04-10 20:39 ` Andrew Pinski
2012-04-11 9:27 ` Richard Guenther
2012-04-11 1:01 ` Lawrence Crowl
2012-04-14 3:40 ` Chiheng Xu
2012-04-14 3:48 ` Chiheng Xu
2012-04-15 20:11 ` Chiheng Xu
2012-04-16 7:48 ` Duncan Sands
2012-04-16 9:23 ` Chiheng Xu
2012-04-16 18:53 ` Oleg Endo
2012-04-17 22:03 ` Chiheng Xu
2012-04-18 0:15 ` Oleg Endo
2012-04-10 11:14 ` Richard Guenther
2012-04-10 16:33 ` Xinliang David Li
2012-04-14 2:41 ` Chiheng Xu
2012-04-04 11:22 ` Diego Novillo
2012-04-04 7:07 ` Tristan Gingold
2012-04-04 13:13 ` Ian Lance Taylor
2012-04-04 13:32 ` Tristan Gingold
2012-04-04 14:37 ` Gabriel Dos Reis
2012-04-04 14:52 ` Tristan Gingold
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