linux-kernel - Re: [PATCH] perf tools: Fix build error on read only source.

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Date:	Mon, 16 Aug 2010 12:24:10 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Kusanagi Kouichi <slash@...auone-net.jp>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Fix build error on read only source.

Em Mon, Aug 16, 2010 at 09:40:13PM +0900, Kusanagi Kouichi escreveu:
... 
> diff --git a/tools/perf/feature-tests.mak b/tools/perf/feature-tests.mak
> @@ -113,7 +113,5 @@ endef
>  # try-cc
>  # Usage: option = $(call try-cc, source-to-build, cc-options)
>  try-cc = $(shell sh -c						  \
> -	'TMP="$(TMPOUT).$$$$";			 		  \
> -	 echo "$(1)" |						  \
> -	 $(CC) -x c - $(2) -o "$$TMP" > /dev/null 2>&1 && echo y; \
> -	 rm -f "$$TMP"')
> +	'echo "$(1)" |						  \
> +	 $(CC) -x c - $(2) -o /dev/null > /dev/null 2>&1 && echo y')

Please read:

 f9af3a4c1f59753bdd5a49e3a34263005f96972e
 8b2c551f9635bf1c5c2d38de300137998915478f
 1703f2c321a8a531c393e137a82602e16c6061cb

To see why we can't use '-o /dev/null' like that.

- Arnaldo
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