Support for cc -m32

[Tijl Coosemans]

On Wednesday 17 November 2010 18:58:11 Warner Losh wrote:
> On 11/17/2010 10:21, Garrett Cooper wrote:
>> On Wed, Nov 17, 2010 at 4:19 AM, Dimitry Andric<dim at freebsd.org>  wrote:
>>> On 2010-08-30 22:09, Tijl Coosemans wrote:
>>>> On Monday 30 August 2010 20:36:36 M. Warner Losh wrote:
>>>>> :>    http://people.freebsd.org/~tijl/cc-m32-1.diff
> This patch looks good.  I agree we should commit it right away.  I can 
> do the honors later today, or dim@ can.  I'm agnostic who does the push.

Committed as r215439.

>>>>> :>    http://people.freebsd.org/~tijl/cc-m32-2.diff
>>>>> :>    http://people.freebsd.org/~tijl/cc-m32-3.diff
> Now that we have tbemd in the tree, we should take a fresh look at these 
> patches.  I'll try to look at these later today as well.

I've updated them to today's CURRENT. They're a bit smaller now because
some amd64 headers have been moved to x86. This also solved the problem
with the kdump build.

Here are the commit logs:

cc-m32-2.diff:

    Install i386 headers on amd64.
    
    Machine specific headers for an architecture $arch are now installed
    under /usr/include/$arch. This means machine headers are always in the
    same location whether you are cross compiling or not.
    
    /usr/include/machine is a symlink to /usr/include/${MACHINE}.

cc-m32-3.diff:
    Modify amd64 headers to include i386 headers when compiling 32 bit code.
    
    All amd64 headers follow the following format:
    
    #ifndef _AMD64_HEADER_H_
    #define _AMD64_HEADER_H_
    
    #ifdef __i386__
    #include <i386/header.h>
    #else
    
    /* Amd64 declarations go here. */
    
    #endif /* __i386__ */
    #endif /* !_AMD64_HEADER_H_ */
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