linux-kernel - Re: [PATCH 3/4] Add __global tag where needed.

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Date:	Fri, 25 Aug 2006 10:52:26 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Add __global tag where needed.

On Thu, 2006-08-24 at 23:30 +0200, Adrian Bunk wrote:
> Applying this doesn't seem to make much sense until it's clear whether a
> "build everything except for assembler files at once" approach (that 
> needs less globals) or your current "compile only multi-obj at once" 
> approach (that requires more globals). 

For the kernel itself, I think that building a directory at once is the
way forward. For modules, obviously the scope is more limited.

Either way, I'd like to prevent the unnecessary proliferation of
__global by instrument the link process somehow so that we get a
_warning_ during the final link if there are any global symbols which
aren't actually used. Having said that, --gc-sections will happily drop
them from the vmlinux anyway so I'm not _overly_ concerned by it.

In fact, I think binutils got patched recently so that it can _tell_ us
what sections got dropped by --gc-sections, which would do the job
nicely.

-- 
dwmw2

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