Gas can't handle prefix generated by gcc

[H. J. Lu]

On Fri, Jul 23, 2004 at 01:51:26PM -0700, H. J. Lu wrote:
> On Fri, Jul 23, 2004 at 01:43:33PM -0700, Zack Weinberg wrote:
> > "H. J. Lu" <hjl@lucon.org> writes:
> > 
> > > On Fri, Jul 23, 2004 at 12:49:48PM -0700, Zack Weinberg wrote:
> > >> Zack Weinberg <zack@codesourcery.com> writes:
> > >> 
> > >> > "H. J. Lu" <hjl@lucon.org> writes:
> > >> >
> > >> >> It seems that gcc uses a prefix syntax which gas doesn't handle. Does
> > >> >> gcc always use " ; " as prefix separator?
> > >> >
> > >> > Yes.  It does that for cs/ds on branch hints, it does that for "rep"
> > >> > on string instructions, it does that for "lock" on atomic updates.
> > >> 
> > >> Correction - it uses either " ; " or \n\t in all the above cases.
> > >> 
> > >
> > > It looks like a gcc bug to me. Assembler has a way to define prefixes
> > > for an instruction. Unfortunately, gcc uses something else. I will
> > > close the assembler bug.
> > 
> > Not so fast.  Is the PREFIX_SEPARATOR mechanism (a) supported by GAS
> > since time immemorial, and (b) supported by all other i386 assemblers
> > since time immemorial?  If *either* of those is not true, GCC can't
> > change.
> 
> It was added to gas on Jun 8, 1998. It is trivial to add a configure
> test before using it. Gcc has many feature tests for assembler.

Correction. It was added before Jun 8, 1998.


H.J.