From mboxrd@z Thu Jan  1 00:00:00 1970
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Subject: Re: [PATCH v2 1/2] scripts: Add a recorduidiv program
Date: Tue, 1 Dec 2015 18:16:43 +0000
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To: Steven Rostedt <rostedt@goodmis.org>
Cc: Michal Marek <mmarek@suse.cz>, Stephen Boyd <sboyd@codeaurora.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, linux-kbuild@vger.kernel.org, Nicolas Pitre <nico@fluxnic.net>, Arnd Bergmann <arnd@arndb.de>, =?iso-8859-1?Q?M=E5ns_Rullg=E5rd?= <mans@mansr.com>
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On Tue, Dec 01, 2015 at 12:22:12PM -0500, Steven Rostedt wrote:
> On Tue, 1 Dec 2015 17:10:14 +0000
> Russell King - ARM Linux <linux@arm.linux.org.uk> wrote:
> 
> > Another suggestion - maybe recordmcount, which fstat()s the file,
> > should check the st_nlink before modifying the file, and error out
> > with a helpful error message telling people not to use hardlinks,
> > which would stop nasty surprises (and make it a rule that this should
> > be implemented as a general principle for good build behaviour) - iow,
> 
> Actually I like this solution the best.
> 
> > something like this (untested):
> 
> Can you test it to see if it gives you the error, otherwise I need to
> set up a CCACHE_HARDLINK environment :-)

It does indeed:

  CC      init/do_mounts_initrd.o
file is hard linked: init/do_mounts_initrd.o
/home/rmk/git/linux-rmk/scripts/Makefile.build:258: recipe for target 'init/do_mounts_initrd.o' failed
make[2]: *** [init/do_mounts_initrd.o] Error 1

> I guess another solution is to do a copy instead of modifying in place
> if it detects the multiple hard link?

That would be the "transparent" solution.  If you think it's worth
persuing, I'll have a go at fixing recordmcount to do that.

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