Re: Change x86 default arch for 4.5?

[Joe Buck <Joe dot Buck at synopsys dot COM>]

On Thu, Feb 18, 2010 at 04:31:37PM -0800, David Daney wrote:
> On 02/18/2010 03:30 PM, Joe Buck wrote:
> > On Thu, Feb 18, 2010 at 02:09:14PM -0800, Jason Merrill wrote:
> >> I periodically get bitten by bug 34115: a compiler configured without
> >> --with-arch on i686-pc-linux-gnu doesn't support atomics.  I think we
> >> would only need to bump the default to i486 to get atomic support.  Can
> >> we reconsider the default for 4.5?
> >
> > Is anyone still manufacturing x86 CPUs that don't support the atomic
> > instructions?
> 
> Should it just be a question of 'manufacturing'?  Or should 'using' be a 
> criterion for any decision?

> Not that I disagree with Jason's suggestion, it is probably the right 
> choice.

"using" would be the right criterion if Jason were advocating removing
support for i386 but he only proposed changing the default.

But maybe I didn't ask the right question: can any x86 experts comment on
recently made x86 CPUs that would not function correctly with code
produced by --with-arch=i486?  Are there any?