linux-kernel - Re: [PATCH 25/33] kbuild: use POSIX BRE in headers install target

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Date:	Sat, 21 Jul 2007 10:22:34 +0200
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	kbuild-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Mike Frysinger <vapier@...too.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 25/33] kbuild: use POSIX BRE in headers install target

* Date: Tue, 17 Jul 2007 16:08:54 +0200
>
> From: Mike Frysinger <vapier@...too.org>
>
> The sed expression used at the moment in scripts/Makefile.headersinst
> relies on the (handy) GNU extension where you can escape ERE's in an
> otherwise BRE without using the GNU -r option.  The following patch
> replaces this "\+" usage with a functionally equivalent POSIX BRE compliant
> "\{1,\}".

Matching at least one occurrence, right?

> Tested with `make headers_install` against blackfin/x86_64/i386
> targets.
>
> Stupid whiny OS X users and their crappy sed ;)

That may be. My games with strict POSIX sed syntax render busybox's sed
as crap for example. So, you never know.

>  # Eliminate the contents of (and inclusions of) compiler.h

OK, that means annotations and non ANSI 'inline' thing. Lets see.

>  HDRSED  := sed 	-e "s/ inline / __inline__ /g" \
[]
> -		-e "s/[[:space:]]__attribute_const__[[:space:]]\+/\ /g" \

* [[:space:]] are more than tab and space isspace(3), is it more
  effective to use [[:blank:]] instead?

> +		-e 
> "s/[[:space:]]__user[[:space:]]\{1,\}

substitute one or more ' __user '

> / /g" \

with ' ', everywhere (flag 'g'). So, is it really needed that '\{' thing?

> +		-e "s/(__user[[:space:]]\{1,\}/ (/g" \
> +		-e "s/[[:space:]]__force[[:space:]]\{1,\}/ /g" \
> +		-e "s/(__force[[:space:]]\{1,\}/ (/g" \
> +		-e "s/[[:space:]]__iomem[[:space:]]\{1,\}/ /g" \
> +		-e "s/(__iomem[[:space:]]\{1,\}/ (/g" \
> +		-e "s/[[:space:]]__attribute_const__[[:space:]]\{1,\}/\ /g" \
>  		-e "s/[[:space:]]__attribute_const__$$//" \

Is it allowed to use identifiers like '__attribute_const__foo' or
__attribute_const__[anything]? If it's not, last line is useless also.

>  		-e "/^\#include <linux\/compiler.h>/d"
whitespace is allowed   ^ here and is used for better readability
sometimes.
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