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Re: [PATCH] Disable building with i386-*, -march=i386 or -mcpu=i386.
- From: "Joseph S. Myers" <joseph at codesourcery dot com>
- To: Carlos O'Donell <carlos at redhat dot com>
- Cc: GNU C Library <libc-alpha at sourceware dot org>, Roland McGrath <roland at hack dot frob dot com>, Andreas Jaeger <aj at suse dot com>, Thomas Schwinge <thomas at codesourcery dot com>
- Date: Thu, 28 Mar 2013 15:59:48 +0000
- Subject: Re: [PATCH] Disable building with i386-*, -march=i386 or -mcpu=i386.
- References: <513FE49D dot 3050406 at redhat dot com> <Pine dot LNX dot 4 dot 64 dot 1303131610540 dot 19781 at digraph dot polyomino dot org dot uk> <51526E77 dot 4040801 at redhat dot com> <Pine dot LNX dot 4 dot 64 dot 1303271431550 dot 23096 at digraph dot polyomino dot org dot uk> <5154668A dot 6000700 at redhat dot com>
On Thu, 28 Mar 2013, Carlos O'Donell wrote:
> On 03/27/2013 10:35 AM, Joseph S. Myers wrote:
> > On Tue, 26 Mar 2013, Carlos O'Donell wrote:
> >
> >> +# Configure for i686 if the user asks for i386. We don't support
> >> +# i386 any more but it continues to be common for users to configure
> >> +# 32-bit x86 as i386. We build for i686 instead.
> >> +if test "$machine" = i386; then
> >> + machine="i686"
> >
> > Wouldn't i486 be more conservative?
>
> It would be, but in truth *everyone* I've talked to wants i686.
>
> The distros build for i686, users use i686, there is no real use
> of i486 or i586 that I can see.
Is it really common for people to configure for i386 at all, rather than
explicitly i686? One option would simply be to give an error.
> Therefore I would like the elision of i386 to be to a value i686
> which has real value for users and is a sensible default in 99%
> of the cases. Defaulting to i486 or i586 might be more conservative
> but is less useful.
>
> What do you think? Is it valid to balance usefullness in this way?
What do other architectures do, when configuring for generic versions of
the architecture name?
> I agree. I'd actually like to rename i386 to x86 and merge i486 down
> in two steps.
ix86? x86 is taken for things shared between 32-bit and 64-bit....
--
Joseph S. Myers
joseph@codesourcery.com