linux-kernel - Re: [PATCH 1/6] kbuild: record needed exported symbols for modules

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Message-ID: <alpine.LFD.2.20.1602082331040.17825@knanqh.ubzr>
Date:	Mon, 8 Feb 2016 23:36:18 -0500 (EST)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Al Viro <viro@...IV.linux.org.uk>
cc:	Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 1/6] kbuild: record needed exported symbols for modules

On Tue, 9 Feb 2016, Al Viro wrote:

> On Mon, Feb 08, 2016 at 03:28:30PM -0500, Nicolas Pitre wrote:
> > +ifdef CONFIG_TRIM_UNUSED_EXPSYMS
> > +cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U \(.*\)/\1/p' | xargs echo
> 
> Umm...  sed -nre 's/^ +U //p', perhaps?

Yep, I like it better.

Although I might be tempted by sed -n 's/^ \+U //p' to avoid the "non 
portable" mention that comes with -r (do we actually care?).


Nicolas