On Sun, Oct 29, 2006 at 05:58:56PM +0000, Oleg Verych wrote:
>
> On 2006-10-29, Andi Kleen wrote:
> >> Why not use -o /dev/null, as Daniel Drake already suggested in [1]? In
> >> both as-instr and ld-option, the tmp file is being deleted
> >> unconditionally right after its creation anyways.
> >
> > Because then when the compilation runs as root some as versions
> > will delete /dev/null on a error. This has happened in the past.
>
> OK, but let users, who still build kernels as root, alone.
This needs to work - there are too much people that continue to do so.
And gentoo books recommended this last time I looked.
>
> In `19-rc3/include/Kbuild.include', just below `as-instr' i see:
> ,--
> |cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
> | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
> |
> |# cc-option-yn
> |# Usage: flag := $(call cc-option-yn, -march=winchip-c6)
> |cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
> | > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
> `--
> so, change to `-o /dev/null' in `as-instr' will just follow this.
gcc does not delete files specified with -o - but binutils does.
So using /dev/null in this case is not an option.
Sam
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