From: Richard Guenther <rguenther@suse.de>
To: "Joseph S. Myers" <joseph@codesourcery.com>
Cc: gcc@gcc.gnu.org
Subject: Re: Prague GCC folks meeting summary report
Date: Thu, 24 Sep 2009 21:26:00 -0000 [thread overview]
Message-ID: <alpine.LNX.2.00.0909242238510.4520@zhemvz.fhfr.qr> (raw)
In-Reply-To: <Pine.LNX.4.64.0909241631220.20240@digraph.polyomino.org.uk>
On Thu, 24 Sep 2009, Joseph S. Myers wrote:
> On Thu, 24 Sep 2009, Richard Guenther wrote:
>
> > We discussed about features we don't like (PCH and -combine). PCH
> > is used but has the issue that improper use is not diagnosed and PCH
> > seems to be unmaintained. We agreed on deprecating -combine for 4.5
> > though.
>
> Can we map -combine to use LTO transparently in 4.6 (deprecate the
> implementation, keep the interface)?
We thought about that, but the issue with LTO is that you need to
use the gcc driver at link time and pass -flto there. But yes,
in principle you could continue to handle -combine in the driver
by doing the link step to build an object file. Supporting it
on cc1 is probably not going to work though.
Is -combine widely used? IIRC it has a lot of known issues and
is basically unmaintained. Maybe if we deprecate -combine for 4.5
we'll get feedback if it is used.
Richard.
next prev parent reply other threads:[~2009-09-24 20:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-24 10:35 Richard Guenther
2009-09-24 15:26 ` Jeff Law
2009-09-24 16:00 ` Joseph S. Myers
2009-09-24 16:34 ` Joseph S. Myers
2009-09-24 21:26 ` Richard Guenther [this message]
2009-09-25 19:14 ` Kevin P. Fleming
2009-10-02 0:00 ` Andi Kleen
2009-10-02 0:21 ` Joe Buck
2009-10-02 9:45 ` Richard Guenther
2009-10-02 13:30 ` Andi Kleen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.LNX.2.00.0909242238510.4520@zhemvz.fhfr.qr \
--to=rguenther@suse.de \
--cc=gcc@gcc.gnu.org \
--cc=joseph@codesourcery.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).