CL for building chomre/ARM for ubuntu precise

================================================================
This is just a FYI - it will not be checked in
(and update for http://codereview.chromium.org/8967004/)
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Once this work complete, the documentation at 
http://code.google.com/p/chromium/wiki/LinuxChromiumArm 

This was confirmed to work on 2012/12/11 with rev 172423

Kudos to Sam Clegg to make everything work out of the box
and ensure that this will continue to work by setting up bots.

[Roland McGrath, 2012-10-11 18:04:05]

http://codereview.chromium.org/11094071/diff/5001/build/common.gypi
File build/common.gypi (right):

http://codereview.chromium.org/11094071/diff/5001/build/common.gypi#newcode2651
build/common.gypi:2651: '-B<(gold_path) -m32',
Why do you think this is needed?
-m32 already appears in ldflags under target_arch==ia32.
It's wrong to add it for any other target_arch.

[robertm, 2012-10-11 19:28:43]

http://codereview.chromium.org/11094071/diff/5001/build/common.gypi
File build/common.gypi (right):

http://codereview.chromium.org/11094071/diff/5001/build/common.gypi#newcode2651
build/common.gypi:2651: '-B<(gold_path) -m32',
The problem is that I need to force the host compiler to be 
ia32 because v8 requires.
I could not find a good way to do so.
So I just added -m32 to CC.host.
This this not take care of the linker however, hence this change.
If there is a better way to force ia32 that would be definitely preferable.



On 2012/10/11 18:04:05, Roland McGrath wrote:
> Why do you think this is needed?
> -m32 already appears in ldflags under target_arch==ia32.
> It's wrong to add it for any other target_arch.

[Roland McGrath, 2012-10-11 20:00:35]

http://codereview.chromium.org/11094071/diff/5001/build/common.gypi
File build/common.gypi (right):

http://codereview.chromium.org/11094071/diff/5001/build/common.gypi#newcode2651
build/common.gypi:2651: '-B<(gold_path) -m32',
On 2012/10/11 19:28:43, robertm wrote:
> The problem is that I need to force the host compiler to be 
> ia32 because v8 requires.
> I could not find a good way to do so.
> So I just added -m32 to CC.host.
> This this not take care of the linker however, hence this change.
> If there is a better way to force ia32 that would be definitely preferable.

If it's for the host, then shouldn't it be inside a '_toolset=="host"'
conditional of some kind?  This looks to me like it's going to apply to
'ldflags' used with CC.target too.

[Robert Muth (chromium), 2012-10-22 14:51:22]

changed setup script to build and install gold from
ftp://sourceware.org/pub/binutils/snapshots/binutils-2.22.90.tar.bz2
the older version use before still had the arm bug