From owner-freebsd-hackers@FreeBSD.ORG  Tue May 19 13:55:36 2009
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Date: Tue, 19 May 2009 09:55:35 -0400 (EDT)
From: Daniel Eischen <deischen@freebsd.org>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: bootstrapping gnat GCC on amd64
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On Tue, 19 May 2009, xorquewasp@googlemail.com wrote:

> On 2009-05-18 18:36:15, Daniel Eischen wrote:
>> Hmm, if the system binutils is 2.15, then it should build
>> as a cross.  You can do a cross build of all FreeBSD - I
>> think you just set TARGET="amd64" to build amd64 from
>> a different arch.  Part of this process should be to
>> create a cross binutils toolset.
>
> Ok.
>
> Silly question - is it actually possible to build contrib/binutils
> (including TARGET=amd64) without building the whole tree? Trying
> the obvious:
>
>  cd /usr/obj
>  /usr/src/contrib/binutils/configure \
>    --target=x86_64-pc-freebsd7.2     \
>    --host=i386-pc-freebsd7.2         \
>    --build=i386-pc-freebsd7.2        \
>    --prefix=/cross/x86_64
>
> .. Didn't work (didn't really expect it to).

I've not done a cross build before, but I'd look in
src/Makefile.inc1 if you want to try to build it
piecemeal (see the target for cross-tools).

-- 
DE