linux-kernel - Re: [PATCH] ld-version: Fix awk regex compile failure

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Date:	Tue, 8 Mar 2016 18:55:02 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	James Hogan <james.hogan@...tec.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>, Michal Marek <mmarek@...e.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-mips@...ux-mips.org, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] ld-version: Fix awk regex compile failure

On Tue, Mar 08, 2016 at 04:47:53PM +0000, James Hogan wrote:
> The ld-version.sh script fails on some versions of awk with the
> following error, resulting in build failures for MIPS:
> 
> awk: scripts/ld-version.sh: line 4: regular expression compile failed (missing '(')
> 
> This is due to the regular expression ".*)", meant to strip off the
> beginning of the ld version string up to the close bracket, however
> brackets have a meaning in regular expressions, so lets escape it so
> that awk doesn't expect a corresponding open bracket.
> 
> Fixes: ccbef1674a15 ("Kbuild, lto: add ld-version and ld-ifversion ...")
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Michal Marek <mmarek@...e.com>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: linux-mips@...ux-mips.org
> Cc: linux-kbuild@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: <stable@...r.kernel.org> # 4.4.x-

Tested-by: Michael S. Tsirkin <mst@...hat.com>
Acked-by: Michael S. Tsirkin <mst@...hat.com>



> ---
> I've only tested this with GNU Awk 4.0.2, which seems a bit more
> lenient than whatever version of awk Geert's build machine is using.
> 
> I'd appreciated if somebody experiencing the error could give this patch
> a spin to check it fixes it.
> ---
>  scripts/ld-version.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
> index d154f0877fd8..7bfe9fa1c8dc 100755
> --- a/scripts/ld-version.sh
> +++ b/scripts/ld-version.sh
> @@ -1,7 +1,7 @@
>  #!/usr/bin/awk -f
>  # extract linker version number from stdin and turn into single number
>  	{
> -	gsub(".*)", "");
> +	gsub(".*\\)", "");
>  	gsub(".*version ", "");
>  	gsub("-.*", "");
>  	split($1,a, ".");
> -- 
> 2.4.10