Re: Please pull from 'for_paulus' branch

From: Arnd Bergmann <arnd@arndb.de>
To: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: Please pull from 'for_paulus' branch
Date: Fri, 29 Jun 2007 15:45:53 +0200	[thread overview]
Message-ID: <200706291545.53890.arnd@arndb.de> (raw)
In-Reply-To: <18052.42546.78964.805791@cargo.ozlabs.ibm.com>

On Friday 29 June 2007, Paul Mackerras wrote:
> It turns out that with Arnd's patches we now get "-mcpu=3Dpowerpc64" on
> the command line, and that means that gcc *doesn't* put "-mppc64" the
> as command line, and as barfs on the 64-bit instructions. =A0That's
> presumably a gcc bug, but we'll have to work around it. =A0I think the
> best thing is just to not put the -mcpu=3Dpowerpc64 in CFLAGS when no
> specific CPU is selected.

I can't reproduce the problem here unfortunately. My idea was to always
pass _some_ -mcpu=3D flag, in order to make sure it does not use
an inappropriate default, e.g. when the compiler is built for a default
for power4 but you actually want to build a power3 kernel.

Would it work reliably if we switch the arguments to
'-mcpu=3Dpowerpc64 -m64' instead of '-m64 -mcpu=3Dpowerpc64'? That
might be better than taking it out entirely.

	Arnd <><