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From: Richard Purdie <richard.purdie@linuxfoundation.org>
To: Hans =?ISO-8859-1?Q?Beck=E9rus?= <hans.beckerus@gmail.com>
Date: Mon, 11 Nov 2013 09:35:51 +0000
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Cc: "Hart, Darren" <darren.hart@intel.com>,
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Subject: Re: [PATCH] kernel: Use hardlinks for do_populate_sysroot for speed
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On Mon, 2013-11-11 at 09:06 +0100, Hans Beckérus wrote:
> I am having some trouble with these patches :( The new approach is
> using the '-n' flag to the 'cp' command.
> That is not supported on our SuSE11 based system. To be honest, I do
> not know how portable '-n' is?
> Some system have it, others seems to provide '-u' instead. I guess by
> removing '-n' part of the performance gain is lost?
> Would it be possible to test for error from the 'cp' command and if it
> fails try '-u' instead (and cache the result)? Or maybe
> even better, make this configurable in local.conf (or the distro) for
> the build platforms that does not support  '-n' but can
> instead fall-back to using '-u'. From what I can tell most systems
> support  one or the other, but never both.

Hmm, its been in coreutils since 2009 which I guess isn't that long in
the scheme of things:
http://git.savannah.gnu.org/cgit/coreutils.git/commit/src/cp.c?id=d01338eb3d30e5634f1b4d4179c229f54eea0b44

Just to double check, is cp on your system provided by coreutils or
something else?

Cheers,

Richard