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RE: Very slow link times on debug versions of C++ program onx86_64. Includes oprofile of ld...
- From: "Talbot, George" <Gtalbot at locuspharma dot com>
- To: "Daniel Jacobowitz" <drow at false dot org>
- Cc: "H. J. Lu" <hjl at lucon dot org>, <binutils at sourceware dot org>
- Date: Wed, 20 Jun 2007 11:25:50 -0400
- Subject: RE: Very slow link times on debug versions of C++ program onx86_64. Includes oprofile of ld...
Can you recommend a particular snapshot? I'll give it a try.
--
George T. Talbot
<gtalbot@locuspharma.com>
> -----Original Message-----
> From: Daniel Jacobowitz [mailto:drow@false.org]
> Sent: Wednesday, June 20, 2007 11:20 AM
> To: Talbot, George
> Cc: H. J. Lu; binutils@sourceware.org
> Subject: Re: Very slow link times on debug versions of C++ program
> onx86_64. Includes oprofile of ld...
>
> On Wed, Jun 20, 2007 at 09:58:42AM -0400, Talbot, George wrote:
> > Thanks for your quick reply.
> >
> > I'll see if I can come up with a testcase.
> >
> > Based upon my examination of oprofile results, I can say that ld is
> > _not_ spending all of its time in I/O, like the previous message
> > suggests. Looking at the oprofile results, it's spending it's time
> > matching wildcards, though of what I'm not exactly sure.
> >
> > What exactly does the "wild_section"/"match_simple_wild" stuff do in
> > there? I'm not sure that I fully understand it. It appears to be
> > matching section names, yes? That seems kinda weird--does a GCC
debug
> > compile have a lot more sections in the .o file?
>
> Have you tried building a HEAD checkout or snapshot? If not, I highly
> recommend it. I think this has been fixed already.
>
> --
> Daniel Jacobowitz
> CodeSourcery