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Date: Mon, 8 Feb 2016 23:12:57 +0100
From: Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH 1/6] kbuild: record needed exported symbols for modules
Message-ID: <20160208221256.GA13832@ravnborg.org>
References: <1454963315-20468-1-git-send-email-nicolas.pitre@linaro.org>
 <1454963315-20468-2-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, Al Viro <viro@ZenIV.linux.org.uk>, Rusty Russell <rusty@rustcorp.com.au>

>  
> +# List module undefined symbols
> +ifdef CONFIG_TRIM_UNUSED_EXPSYMS
> +cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U \(.*\)/\1/p' | xargs echo
> +else
> +cmd_undef_syms = echo
> +endif
Use ":" as a "do nothing" cammand. Then you do not emit an empty line.

	Sam