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

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Message-ID: <ada3a3a6xs6.fsf@roland-alpha.cisco.com>
Date:	Wed, 16 Dec 2009 20:15:53 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Andrew Isaacson <adi@...are.com>, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.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


 >        For  example,  before the POSIX standard, to match alphanumeric charac-
 >        ters, you would have had to write /[A-Za-z0-9]/.  If your character set
 >        had  other  alphabetic characters in it, this would not match them, and
 >        if your character set collated differently from ASCII, this  might  not
 >        even match the ASCII alphanumeric characters.  With the POSIX character
 >        classes, you can write /[[:alnum:]]/, and this matches  the  alphabetic
 >        and numeric characters in your character set, no matter what it is.

I'm not sure I understand this, although I'm not a character set expert.
But is there really some possible locale + awk implementation where an
awk script, written in pure ASCII, operating on a pure ASCII input file,
will have [A-Za-z0-9] match a different set of ASCII characters than
[[:alnum:]] will match?

 - R.
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