netdev - Re: [net-next PATCH V4 1/5] samples/bpf: add back functionality to redefine LLC command

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Message-ID: <20160428164046.0998f03d@redhat.com>
Date:	Thu, 28 Apr 2016 16:40:46 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:	netdev@...r.kernel.org, linux-kbuild@...r.kernel.org,
	bblanco@...mgrid.com, borkmann@...earbox.net,
	alexei.starovoitov@...il.com, brouer@...hat.com
Subject: Re: [net-next PATCH V4 1/5] samples/bpf: add back functionality to
 redefine LLC command

On Thu, 28 Apr 2016 18:51:33 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:

> > Add this features back. Note that it is possible to redefine the LLC
> > on the make command like:
> > 
> >  make samples/bpf/ LLC=~/git/llvm/build/bin/llc  
> 
> I don't have an objection to this patch, but you didn't explain why/how 
> this approach is better than just doing:
>   PATH=~/git/llvm/build/bin make samples/bpf/

It is almost the same. There is always another way to do the same.

I explicitly use this to test different combinations of LLC and CLANG,
in-order to validate Alexei's claim that older versions of CLANG could
still work with a newer version of LLC.  Thus, one use-case you
approach cannot cover ;-)

And clang seems to install a clang-3.9, which my solution also covers
by explicitly specifying CLANG=clang-3.9, if several avail clang's are
in the PATH.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer