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

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Date:	Thu, 17 Dec 2009 00:21:53 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Roland Dreier <rdreier@...co.com>,
	Andrew Isaacson <adi@...are.com>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	Rob Landley <rob@...dley.net>
Subject: Re: CONFIG_KPROBES=y build requires gawk

H. Peter Anvin wrote:
> On 12/16/2009 08:09 PM, Roland Dreier wrote:
>>
>>  > > Is there any reason not to apply the patch below, to allow more awk
>>  > > implementations to be used?  After all, it's not like we're going to put
>>  > > non-ASCII characters into the map file...
>>
>>  > I guess the question is if it will break under any other circumstances,
>>  > but I guess we can find those when we get to them.
>>
>> I should have mentioned it, but with the current Debian testing version
>> (mawk 1.3.3-15) and my patch, I get a byte-for-byte identical
>> inat-tables.c to what I get with the unpatched kernel and gawk
>> 1:3.1.6.dfsg-4.
>>
>> I'm not sure how likely all this is to change in the future, but it's
>> hard for me to see a sane reason why eg [:lower:] and a-z would be
>> different for this use.
>>
> 
> If LC_COLL != C they can be.  The solution would be to force LC_COLL=C.

Hmm, it's complicated :(.  Peter, Roland, I don't want to be annoyed
by those environmental variables. If my last suggestion is acceptable,
could you do as below on your patch :)?

> Ualpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
> Lalpha = "abcdefghijklmnopqrstuvwxyz"
> alpha = Ualpha Lalpha
> digit = "0123456789"
> alnum = alpha digit
> 
> and replace character classes with it. ("[[:alpha:]]"->"[" alpha "]")

Thank you,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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