gcc-4.1-20050709: alpha: "macro requires $at register while noat in effect" while compiling Linux kernel

[Richard Henderson]

On Mon, Jul 11, 2005 at 09:52:22AM -0700, Dan Kegel wrote:
> >No, this code is protected by various system checks.
> >
> >We want -mcpu=ev5 such that the kernel as a whole will run everywhere,
> >but we require these specific instructions on specific ev56/ev6 systems
> >for i/o.
> 
> rth, can you eyeball the summary I posted at 
> http://marc.theaimsgroup.com/?l=linux-kernel&m=112109202911699&w=2 ?
> My limited understanding is that gcc is fine, no need to revert anything,
> but the linux kernel configury needs to stop doing
>   -mcpu=ev5 -Wa,-mev6
> for CONFIG_ALPHA_EV5/CONFIG_ALPHA_GENERIC, since those specific instructions
> really aren't there on real ev5 machines, and passing
> -Wa,-mev6 keeps it from substituting a macro.

Absolutely not.  While one can argue about which in the gcc+binutils
pair is buggy, the kernel is *not* buggy.

Please re-read my problem description above, and recall that this is
for a GENERIC kernel, that runs on ALL alpha systems.


r~