From: "H. Peter Anvin" <[email protected]>
Date: Sat, 03 Jun 2006 15:26:05 -0700
> __arch64__ is ugly; it doesn't say it's a sparc thing. I have added
> -D__sparc_v9__ to the sparc64 MCONFIG file, so I think that's fine.
>
> Perhaps the right thing to do is to make this an archconfig.h configurable.
Please don't do this, I'll explain why.
Using __sparc_v9__ is incorrect, here is the lowdown on these defines:
1) __sparc_v9__ means "-mcpu={ultrasparc*,niagara}" or "-mcpu=v9".
Although this is implied by "-m64" it can be used for 32-bit
code too.
__sparc_v9__ means "using v9 instructions" which does not
necessarily mean 64-bit
2) "__sparc__ && __arch64__" means 64-bit sparc
People often get this wrong, and it certainly is confusing.
Jakub Jelinek gives a good explanation on the gcc mailing
list here:
http://gcc.gnu.org/ml/gcc/2002-12/msg00108.html
Thanks.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
