linux-kernel - Re: [PATCH] scripts/Kbuild.include: Fix portability problem of "echo -e"

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Message-ID: <20120226210551.GA659@merkur.ravnborg.org>
Date:	Sun, 26 Feb 2012 22:05:51 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Bernhard Walle <bernhard@...lle.de>
Cc:	mmarek@...e.cz, lacombar@...il.com, linux-kernel@...r.kernel.org,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	zippel@...ux-m68k.org
Subject: Re: [PATCH] scripts/Kbuild.include: Fix portability problem of
	"echo -e"

On Sun, Feb 26, 2012 at 06:51:34PM +0100, Bernhard Walle wrote:
> Am 26.02.12 18:48, schrieb Sam Ravnborg:
> >> > --- a/scripts/Kbuild.include
> >> > +++ b/scripts/Kbuild.include
> >> > @@ -104,7 +104,7 @@ as-option = $(call try-run,\
> >> >  # Usage: cflags-y += $(call as-instr,instr,option1,option2)
> >> >  
> >> >  as-instr = $(call try-run,\
> >> > -	/bin/echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3))
> >> > +	printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3))
> >> >  
> >> >  # cc-option
> >> >  # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
> > Roman Zippel removed use of printf in this patch: beda9f3a13bbb22cde92a45f230a02ef2afef6a9
> > 
> > I cannot remember why - but it would be good if you could dig up
> > why - just so we do not hit an old issue again.
> 
> Well, he used printf "$(1)", that's different from printf "%b\n" "$(1)"
> since format strings inside $(1) would be interpreted.
Makes good sense.

> 
> But maybe Roman can comment on that? Cc'ing him.
Would be good to hear from Roman - but he has been MIA for some years now :-(

	Sam
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