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

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Date:	Thu, 17 Dec 2009 06:45:24 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Masami Hiramatsu <mhiramat@...hat.com>,
	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

On Wed, Dec 16, 2009 at 09:11:09PM -0800, 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...)
> 
> OK, updated patch:
> 
> ===
> 
> x86: Don't use POSIX character classes in gen-insn-attr-x86.awk
> 
> Not all awk implementations (including the default awk in Ubuntu 9.10)
> support POSIX character classes.  Since x86-opcode-map.txt is plain
> ASCII, we can just use explicit ranges for lower case, alphabetic, and
> alphanumeric characters instead.  We set LC_ALL=C when invoking awk so
> that ASCII ranges are never misinterpreted.
> 
> I verified that the Debian version of mawk, which doesn't have POSIX
> character set suport, generates the byte-for-byte the same inat-tables.c
> after this patch as gawk did on an unpatched kernel.
> 
> Signed-off-by: Roland Dreier <rolandd@...co.com>
> ---
>  arch/x86/lib/Makefile                |    2 +-
>  arch/x86/tools/gen-insn-attr-x86.awk |   10 ++++------
>  2 files changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
> index 45b20e4..0c46d60 100644
> --- a/arch/x86/lib/Makefile
> +++ b/arch/x86/lib/Makefile
> @@ -5,7 +5,7 @@
>  inat_tables_script = $(srctree)/arch/x86/tools/gen-insn-attr-x86.awk
>  inat_tables_maps = $(srctree)/arch/x86/lib/x86-opcode-map.txt
>  quiet_cmd_inat_tables = GEN     $@
> -      cmd_inat_tables = $(AWK) -f $(inat_tables_script) $(inat_tables_maps) > $@ || rm -f $@
> +      cmd_inat_tables = LC_ALL=C $(AWK) -f $(inat_tables_script) $(inat_tables_maps) > $@ || rm -f $@

This will result in error messages in english always from awk - no?
Some people will care.

	Sam
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