linux-kernel - Re: [PATCH -mm] replacement for broken kbuild-dont-put-temp-files-in-the-source-tree.patch

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Message-ID: <20061029225234.GA31648@uranus.ravnborg.org>
Date:	Sun, 29 Oct 2006 23:52:34 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	LKML <linux-kernel@...r.kernel.org>,
	Oleg Verych <olecom@...wer.upol.cz>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...l.org>,
	Jan Beulich <jbeulich@...ell.com>, jpdenheijer@...il.com,
	dsd@...too.org, draconx@...il.com, kernel@...too.org
Subject: Re: [PATCH -mm] replacement for broken kbuild-dont-put-temp-files-in-the-source-tree.patch

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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