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

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Message-ID: <slrnekc3q8.2vm.olecom@flower.upol.cz>
Date:	Mon, 30 Oct 2006 14:42:16 +0000
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	"Jan Beulich" <jbeulich@...ell.com>,
	Oleg Verych <olecom@...wer.upol.cz>, <dsd@...too.org>,
	<kernel@...too.org>, <draconx@...il.com>, <jpdenheijer@...il.com>,
	"Andrew Morton" <akpm@...l.org>, "Sam Ravnborg" <sam@...nborg.org>,
	"Andi Kleen" <ak@...e.de>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm] replacement for broken	kbuild-dont-put-temp-files-in-the-source-tree.patch


On 2006-10-30, Jan Beulich wrote:
>
>>>gcc does not delete files specified with -o - but binutils does.
>>>So using /dev/null in this case is not an option.
>>
>>Hmm. What's the preblem to invoke `as' via the GNU C compiler, then?
>
>Older gas, whether invoked from gcc or the command line or elsewhere,
>deletes its output on error, regardless of whether this is a special file
>(device). gcc can't make gas not do so.

So, how about (using your btmp directory) create symlink to /dev/null in
the (dev) sub-directory and then set no write permission? No tmp,
things are local to build output, old gas's happy:
,__
|olecom@...wer:/tmp/_build_2.6.19-rc3/btmp
!__$ mkdir dev
,__
|olecom@...wer:/tmp/_build_2.6.19-rc3/btmp
!__$ cd dev ; ln -s /dev/null null ; chmod u-w . ; ls -la
total 0
dr-xr-x--- 2 olecom root 60 2006-10-30 15:34 .
drwxr-x--- 3 olecom root 80 2006-10-30 15:34 ..
lrwxrwxrwx 1 olecom root  9 2006-10-30 15:34 null -> /dev/null
,__
|olecom@...wer:/tmp/_build_2.6.19-rc3/btmp/dev
!__$ cd .. ; rm dev/null
rm: cannot remove dev/null': Permission denied
,__
|olecom@...wer:/tmp/_build_2.6.19-rc3/btmp
!__$ echo ok > dev/null
,__
|olecom@...wer:/tmp/_build_2.6.19-rc3/btmp
!__$

New featured dev/null may be set in some kind of make variable, say
$(null) in scripts/Kbuild.include.
____
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