From kde-devel  Thu Jan 24 09:07:53 2002
From: Allan Sandfeld Jensen <snowwolf () one2one-networks ! com>
Date: Thu, 24 Jan 2002 09:07:53 +0000
To: kde-devel
Subject: Re: KDE speed issues
X-MARC-Message: https://marc.info/?l=kde-devel&m=101186353817430

On Wednesday 23 January 2002 21:52, Martijn Klingens wrote:
> On Tuesday 22 January 2002 23:15, rcm wrote:
> > 	Yes why dont all the KDE packages build with support for
> > objprelink.....i it with qt and it seems fine...maybe at least the
> > kdelibs and kdebase should have this support...and it seems a good idea
> > to have -march=XXX optimization support........and maybe try -O3 :):) ???
>
> export CXXFLAGS="-march=i386 -mcpu=i686 -O3"
> export CFLAGS=$CXXFLAGS
> ./configure [ ... ]
>
> Should do the trick. The only thing I wonder about is why I read on several
> occasions that -march *must* be i386, even if -mcpu is higher, because of
> stability problems. As I used all this optimizing only once until now (I
> mostly have debug builds ;-) I didn't want to take the risk on a production
> box.
>
> Anyone who knows why -march=i686 is unstable? (or why that story is a
> fable?)
>
Why do you believe it is unstable? .. I use it on several production system, 
and I have never had problems. (These machines a Pentium III)
(I use -O2 -march=686 -finline-functions, maybe -O3 -march=i686 is the 
culprit)
-Allan
 
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