lkml.org 
[lkml]   [2009]   [Sep]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RFC 1/2] Makefile: Never use -fno-omit-frame-pointer
On Sat, Jul 18, 2009 at 02:01:45PM +0200, Ingo Molnar wrote:
>
> * Anton Vorontsov <avorontsov@ru.mvista.com> wrote:
>
> > On Wed, Jun 17, 2009 at 12:16:30AM +0400, Anton Vorontsov wrote:
> > > According to Segher Boessenkool and GCC manual, -fomit-frame-pointer
> > > is only the default when optimising on archs/ABIs where it doesn't
> > > hinder debugging and -pg. So, we do not get it by default on x86,
> > > not at any optimisation level.
> > >
> > > On the other hand, *using* -fno-omit-frame-pointer causes gcc to
> > > produce buggy code on PowerPC targets.
> > >
> > > If Segher and GCC manual are right, this patch should be a no-op
> > > for all arches except PowerPC, where the patch fixes gcc issues.
> > >
> > > Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
> > > ---
> > >
> > > See this thread for more discussion:
> > > http://osdir.com/ml/linux-kernel/2009-05/msg01754.html
> > >
> > > p.s.
> > > Obviously, I didn't test this patch on anything else but PPC32. ;-)
> > >
> > > Segher, do you know if all GCC versions that we support for
> > > building Linux are behaving the way that GCC manual describe?
> >
> > No news is good news... Ingo, can we merge this into -tip for
> > testing?
>
> Changes to the top level Makefile should really go via Sam's kbuild
> tree.

Sam, any thoughts about these patches?

Thanks!

--
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2


\
 
 \ /
  Last update: 2009-09-04 18:57    [W:0.071 / U:0.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site