Bug#184446: libstdc++5-dev has i486 specific asm code
On Sat, Mar 15, 2003 at 04:49:55PM -0500, Phil Edwards wrote:
> On Sat, Mar 15, 2003 at 08:32:26PM +0100, Matthias Klose wrote:
> > Daniel Jacobowitz writes:
> > > On Wed, Mar 12, 2003 at 12:49:44PM +0100, Sebastian Wilhelmi wrote:
> > > >
> > > > The file /usr/include/c++/3.2/i386-linux/bits/atomicity.h
> > > > has code, which does not work on i386. It needs i486 or above.
> > >
> > > The comment in that file says:
> > >
> > > // Low-level functions for atomic operations: x86, x < 4 version -*- C++ -*-
> > >
> > > Is that incorrect? Hmm, it's the same as the 486 version, so the
> > > comment is wrong.
> > >
> > > This will be fixed in gcc 3.3 (at a performance penalty; we need to
> > > think about providing the i486 version also).
> >
> > or we do think to drop i386 alltogether? How should this library be
> > installed? Building can be done in a second libstdc++-v3 build dir
> > with the compiler just built and -march=486 -mtune=585.
>
> To expand on Daniel's comment: libstdc++ has "dropped" i386, in the
> sense of, "i386 has been folded in with the "any random crappy chip with
> no special abilities" target".
>
> Debian already hurts the x86 users (IMHO) by giving them a compiler
> targetted for processor which, I'd bet, is used by less than 2% of the
> user base. This is just one more performace hit on top of all the others;
> I really wouldn't worry about it unless/until the compiler is targeted
> to something more useful, e.g., i486, i586, or (quelle suprise) i686,
> and for those cases the atomic operations will be automatically corrected.
If it weren't for the disk/archivespace/maintenance/PITA cost I'd
suggest binary-i686. Things being what they are, maybe we should poll
for people interested in new versions of Debian on i386; I doubt we can
drop 586, since I've seen uses of 'em recently...
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
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