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From: Andi Kleen <ak@suse.de>
To: Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH for review] [67/145] x86_64: Detect CFI support in the assembler at runtime
Date: Fri, 11 Aug 2006 07:55:58 +0200
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On Friday 11 August 2006 07:39, Sam Ravnborg wrote:
> > +# as-instr
> > +# Usage: cflags-y += $(call as-instr, instr, option1, option2)
> > +
> > +as-instr = $(shell if echo -e "$(1)" | $(AS) -Z -o /dev/null \
> > +		   2>&1 >/dev/null ; then echo "$(2)"; else echo "$(3)"; fi;)
> 
> Have you checked that as will not delete yout /dev/null if you build as
> root? ld do so if you specify /dev/null as output file.

No. But it's probably safter to do it otherwise. Do you have an alternative?

-Andi