Bug#184446: libstdc++5-dev has i486 specific asm code

[Phil Edwards <phil@jaj.com>]

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.


Phil

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