From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from zeniv.linux.org.uk ([195.92.253.2]:55235 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935572AbZLQEa0 (ORCPT ); Wed, 16 Dec 2009 23:30:26 -0500 Date: Thu, 17 Dec 2009 04:30:21 +0000 From: Al Viro Subject: Re: CONFIG_KPROBES=y build requires gawk Message-ID: <20091217043021.GV14381@ZenIV.linux.org.uk> References: <20091216235617.GA12267@hexapodia.org> <20091217011932.GT14381@ZenIV.linux.org.uk> <4B29A8F3.3090306@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4B29A8F3.3090306@redhat.com> Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: Masami Hiramatsu Cc: Andrew Isaacson , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, Rob Landley On Wed, Dec 16, 2009 at 10:43:47PM -0500, Masami Hiramatsu wrote: > Al Viro wrote: > > On Wed, Dec 16, 2009 at 03:56:17PM -0800, Andrew Isaacson wrote: > >> With CONFIG_KPROBES=y on Ubuntu 9.10 x86_64 default install, I get the > >> following: > >> > >> Error: Your awk doesn't support charactor-class. > >> Please try to use gawk. > > > > Aside of the incorrect suggestion (you need not just gawk, you need that > > thing installed as awk), the use of GNUisms in there is actually pointless > > since encoding is bloody fixed. > > Hmm, maybe "POSIX awk" will be a better suggestion, isn't it? Not really. Note that meaning of [:alpha:] depends on locale, and you are working with fixed input, in fixed encoding. So you *already* have a dependency on locale and it's no better or worse way to express the set than A-Za-z is. With LANG=C both describe the set you are after; in other locales neither is guaranteed to. And having it set by caller of your script is trivial. IOW, you are actually misusing the language feature and while it's easy to fix, the same fix will remove any benefits compared to universally available alternative language feature.