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Re: [Xen-devel] [PATCH] Fix 64-bit foreign header check

To: Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] Fix 64-bit foreign header check
From: John Levon <john.levon@xxxxxxx>
Date: Wed, 15 Aug 2007 16:27:05 +0100
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On Wed, Aug 15, 2007 at 03:59:49PM +0100, Keir Fraser wrote:

> >> Won't gcc produce 64-bit binaries by default in a 64-bit environment?
> > 
> > There is no such thing as a "64-bit environment" on Solaris, all machines 
> > ship
> > with both 32 and 64 bit functionality (of course the kernel must be 64-bit 
> > to
> > actually /use/ such).
> > 
> > Thus we build twice, once in 32-bit, once in 64-bit.
> Then isn't your TARGET_ARCH!=COMPILE_ARCH for one of these builds? Sounds
> like you have a 32-bit-ish compile environment (since you produce 32-bit
> binaries by default), and hence it would be correct to have
> COMPILE_ARCH==x86_32 for both builds.

There is no such "32-bit" environment, we can always produce both.  What you're
suggesting sounds like a cross-compile. This is absolutely not a cross compile;
in particular we can and do want this header check to happen.

We set XEN_COMPILE_ARCH by hand to 64-bit since the Xen makefiles have the 
that uname has anything to do with 32 or 64 bitness (a Linux-ism; in fact an
x86_64-Linux-ism, since I believe other Linux arches do it the traditional


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