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

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Message-ID: <4F4A7126.6020009@bwalle.de>
Date:	Sun, 26 Feb 2012 18:51:34 +0100
From:	Bernhard Walle <bernhard@...lle.de>
To:	Sam Ravnborg <sam@...nborg.org>
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"

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.

But maybe Roman can comment on that? Cc'ing him.


Regards,
Bernhard



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