netdev - RE: [net-next PATCH 4/4] samples/bpf: allow make to be run from samples/bpf/ directory

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Date:	Wed, 27 Apr 2016 13:15:42 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Alexei Starovoitov' <alexei.starovoitov@...il.com>,
	"Jesper Dangaard Brouer" <brouer@...hat.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"bblanco@...mgrid.com" <bblanco@...mgrid.com>,
	"borkmann@...earbox.net" <borkmann@...earbox.net>,
	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>
Subject: RE: [net-next PATCH 4/4] samples/bpf: allow make to be run from
 samples/bpf/ directory

From: Alexei Starovoitov
> Sent: 26 April 2016 15:35
> On Tue, Apr 26, 2016 at 01:09:32PM +0200, Jesper Dangaard Brouer wrote:
> > It is not intuitive that 'make' must be run from the top level
> > directory with argument "samples/bpf/" to compile these eBPF samples.
> >
> > Introduce a kbuild make file trick that allow make to be run from the
> > "samples/bpf/" directory itself.  It basically change to the top level
> > directory and call "make samples/bpf/" with the "/" slash after the
> > directory name.
> >
> > Also add a clean target that only cleans this directory, by taking
> > advantage of the kbuild external module setting M=$PWD.
> >
> > Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> > ---
> >  samples/bpf/Makefile   |    8 ++++++++
> >  samples/bpf/README.rst |    3 +++
> >  2 files changed, 11 insertions(+)
> >
> > diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
> > index 7ac66f5bbbf5..7370dfee482f 100644
> > --- a/samples/bpf/Makefile
> > +++ b/samples/bpf/Makefile
> > @@ -85,6 +85,14 @@ HOSTLOADLIBES_test_overhead += -lelf -lrt
> >  #  make samples/bpf/ LLC=~/git/llvm/build/bin/llc
> >  LLC ?= llc
> >
> > +# Trick to allow make to be run from this directory
> > +all:
> > +	$(MAKE) -C ../../ $$PWD/
> > +
> > +clean:
> > +	$(MAKE) -C ../../ M=$$PWD clean
> > +	@rm -f *~
> > +
> 
> nice trick!

Another nice 'trick' is to write a GNUmakefie containing the local rules.
GNU make will read it in preference to Makefile and makefile.

	David