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

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Message-ID: <20091217075416.GA4002@merkur.ravnborg.org>
Date:	Thu, 17 Dec 2009 08:54:16 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Michal Marek <mmarek@...e.cz>, Roland Dreier <rdreier@...co.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Andrew Isaacson <adi@...are.com>,
	Ingo Molnar <mingo@...hat.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 09:56:46PM -0800, H. Peter Anvin wrote:
> On 12/16/2009 09:45 PM, Sam Ravnborg wrote:
> >>
> >> 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 $@
> > 
> > This will result in error messages in english always from awk - no?
> > Some people will care.
> > 
> 
> True, we probably don't want to set LC_MESSAGES.  Which means:
> 
> diff --git a/Makefile b/Makefile
> index 33d4732..357e83b 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -302,6 +302,13 @@ MAKEFLAGS += --include-dir=$(srctree)
>  $(srctree)/scripts/Kbuild.include: ;
>  include $(srctree)/scripts/Kbuild.include
> 
> +# Avoid funny character set dependencies
> +LC_ALL=
> +LC_CTYPE=C
> +LC_COLLATE=C
> +LC_NUMERIC=C
> +export LC_ALL LC_CTYPE LC_COLLATE LC_NUMERIC
> +
>  # Make variables (CC, etc...)
> 
>  AS		= $(CROSS_COMPILE)as
> 
> 
> OK?

We tried something like this some time ago.
I cannot recall the details anymore but I managed to dig out this link:

http://git.kernel.org/?p=linux/kernel/git/torvalds/old-2.6-bkcvs.git;a=commit;h=191ba46a4aceb72f8481c58069b61f5e8cdef1f0

Today IIRC we no longer export the variable CFLAGS_vmlinux.lds.o so this may be a non-issue.
I bring up this only to say that there be some hidden side-effects of manipulating
with LC_*.
Back then I never understood exactly what was wrong - I just did the obvious revert.

One rationale behind the whish to add LC_* back then was to speed up the build.
I recall it had a measureable effect - but memory may trick me here.

	Sam
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