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

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

[James Hogan]

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@linux-m68k.org>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Michal Marek <mmarek@suse.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kbuild@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: <stable@vger.kernel.org> # 4.4.x-
---
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

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

[Michael S. Tsirkin]

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@linux-m68k.org>
> Signed-off-by: James Hogan <james.hogan@imgtec.com>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: Michal Marek <mmarek@suse.com>
> Cc: Andi Kleen <ak@linux.intel.com>
> Cc: "Michael S. Tsirkin" <mst@redhat.com>
> Cc: linux-mips@linux-mips.org
> Cc: linux-kbuild@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: <stable@vger.kernel.org> # 4.4.x-

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

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

[Sudip Mukherjee]

On Tuesday 08 March 2016 10:17 PM, 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@linux-m68k.org>
> Signed-off-by: James Hogan <james.hogan@imgtec.com>

This error was only coming in my gitlab builds but was not showing in 
the build of travis-ci. Maybe it depends on the version of awk also.
Build log at: https://gitlab.com/sudipm/linux-next/builds/839573

Tested-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>

regards
sudip

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

[James Hogan]

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On Thu, Mar 10, 2016 at 11:19:57PM +0530, Sudip Mukherjee wrote:
> On Tuesday 08 March 2016 10:17 PM, 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@linux-m68k.org>
> > Signed-off-by: James Hogan <james.hogan@imgtec.com>
> 
> This error was only coming in my gitlab builds but was not showing in 
> the build of travis-ci. Maybe it depends on the version of awk also.
> Build log at: https://gitlab.com/sudipm/linux-next/builds/839573
> 
> Tested-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>

Great, that looks pretty conclusive. Thanks for testing Sudip and
Michael.

Ralf: is it too late to get this into v4.5 via MIPS tree?

Cheers
James

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