linux-kernel - Re: CONFIG_KPROBES=y build requires gawk

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Message-Id: <200912162343.16541.rob@landley.net>
Date:	Wed, 16 Dec 2009 23:43:15 -0600
From:	Rob Landley <rob@...dley.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Roland Dreier <rdreier@...co.com>, Michal Marek <mmarek@...e.cz>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Andrew Isaacson <adi@...are.com>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: CONFIG_KPROBES=y build requires gawk

On Wednesday 16 December 2009 23:21:44 H. Peter Anvin wrote:
> On 12/16/2009 09:11 PM, Roland Dreier wrote:
> >  > As Al Viro said, if we run awk with LC_ALL=C, then the characters will
> >  > be sorted as ASCII. So, your patch is OK if you can add LC_ALL=C just
> >  > before $(AWK). (I'm not so sure whether Makefile can accept it...)
>
> I would strongly prefer the following solution as it solves this entire
> class of problems globally, although I'd really want Michal's ACK for it:
>
> diff --git a/Makefile b/Makefile
> index 33d4732..7fefc13 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -302,6 +302,10 @@ MAKEFLAGS += --include-dir=$(srctree)
>  $(srctree)/scripts/Kbuild.include: ;
>  include $(srctree)/scripts/Kbuild.include
>
> +# Avoid funny character set dependencies
> +LC_ALL=C
> +export LC_ALL
> +
>  # Make variables (CC, etc...)
>
>  AS		= $(CROSS_COMPILE)as

Agreed.  Otherwise we can get strange new breakabe in future just because 
somebody builds in a _locale_ we've never heard of.  We must specify this to 
get consistent behavior.

And keep in mind, specifying this _is_ part of POSIX 2008.  The standard is 
online, even:

  http://www.opengroup.org/onlinepubs/9699919799/utilities/awk.html#tag_20_06_08
  http://www.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html#tag_07_02

Rob
-- 
Latency is more important than throughput. It's that simple. - Linus Torvalds
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