svn commit: r204309 - in head/sys: amd64/amd64 amd64/isa conf i386/bios i386/cpufreq i386/i386 i386/isa i386/xen isa modules/bios/smbios modules/bios/vpd modules/cpufreq pc98/pc98 x86 x86/bios x86/...

[Nathan Whitehorn]

M. Warner Losh wrote:
> In message: <20100228195041.GA68446 at server.vk2pj.dyndns.org>
>             Peter Jeremy <peterjeremy at acm.org> writes:
> : On 2010-Feb-26 14:57:36 +0100, Attilio Rao <attilio at freebsd.org> wrote:
> : >For the future, however, probabilly we would need to do something like
> : >pc98 already does wrt i386 (i386/include/ pc98/include/ amd64/include/
> : >just have files wrappers to the generic one under x86/include/ when
> : >necessary).
> : 
> : Not that something like this is also critical for getting i386/amd64
> : cross compilation to work - one of the blocking issues is that the
> : correct machine/ includes are not available in cross-compilatio mode.
>
> Huh?
>
> I cross build all the time, and the machine/ includes are always
> right, with or without this patch.  Maybe you could explain what you
> mean here...
>
> The issue is that old code has
>
> #include <i386/isa.h>
>
> or whatever in it, and we need to have an i386/isa.h that's just
> #include <x86/isa.h>
>
> Warner
>   
I'm guessing what was meant is that one benefit of a merged tree (like 
we will have with powerpc) is that you can do cc -m32 on a 64-bit host 
to get a 32-bit binary, which is less than trivial now.
-Nathan