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Date: Tue, 9 Feb 2016 04:15:25 +0000
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PATCH 1/6] kbuild: record needed exported symbols for modules
Message-ID: <20160209041525.GF17997@ZenIV.linux.org.uk>
References: <1454963315-20468-1-git-send-email-nicolas.pitre@linaro.org>
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To: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Michal Marek <mmarek@suse.com>, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, Rusty Russell <rusty@rustcorp.com.au>

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?