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Date: Tue, 26 Apr 2016 13:09:32 +0200 From: Jesper Dangaard Brouer <brouer@...hat.com> To: netdev@...r.kernel.org Cc: bblanco@...mgrid.com, borkmann@...earbox.net, alexei.starovoitov@...il.com, linux-kbuild@...r.kernel.org, Jesper Dangaard Brouer <brouer@...hat.com> Subject: [net-next PATCH 4/4] samples/bpf: allow make to be run from samples/bpf/ directory 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 *~ + # Verify LLVM compiler is available and bpf target is supported .PHONY: verify_cmd_llc verify_target_bpf diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst index 3e1ac05d8e7c..3a9e6c4099aa 100644 --- a/samples/bpf/README.rst +++ b/samples/bpf/README.rst @@ -47,6 +47,9 @@ For compiling goto kernel top level build directory and run make like:: Do notice the "/" slash after the directory name. +It is also possible to call make from this directory. This will just +hide the the invocation of make as above with the appended "/". + Manually compiling LLVM with 'bpf' support ------------------------------------------
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