From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesper Dangaard Brouer Subject: [net-next PATCH V3 2/5] samples/bpf: Makefile verify LLVM compiler avail and bpf target is supported Date: Wed, 27 Apr 2016 09:30:18 +0200 Message-ID: <20160427073018.29959.57913.stgit@firesoul> References: <20160427072855.29959.70252.stgit@firesoul> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: linux-kbuild@vger.kernel.org, bblanco@plumgrid.com, Jesper Dangaard Brouer , naveen.n.rao@linux.vnet.ibm.com, borkmann@iogearbox.net, alexei.starovoitov@gmail.com To: netdev@vger.kernel.org Return-path: In-Reply-To: <20160427072855.29959.70252.stgit@firesoul> Sender: linux-kbuild-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Make compiling samples/bpf more user friendly, by detecting if LLVM compiler tool 'llc' is available, and also detect if the 'bpf' target is available in this version of LLVM. Signed-off-by: Jesper Dangaard Brouer Acked-by: Alexei Starovoitov --- samples/bpf/Makefile | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 5bae9536f100..45859c99f573 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -85,6 +85,24 @@ HOSTLOADLIBES_test_overhead += -lelf -lrt # make samples/bpf/ LLC=~/git/llvm/build/bin/llc LLC ?= llc +# Verify LLVM compiler is available and bpf target is supported +.PHONY: verify_cmd_llc verify_target_bpf + +verify_cmd_llc: + @if ! (which "${LLC}" > /dev/null 2>&1); then \ + echo "*** ERROR: Cannot find LLVM tool 'llc' (${LLC})" ;\ + exit 1; \ + else true; fi + +verify_target_bpf: verify_cmd_llc + @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \ + echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\ + echo " NOTICE: LLVM version >= 3.7.1 required" ;\ + exit 2; \ + else true; fi + +$(src)/*.c: verify_target_bpf + # asm/sysreg.h - inline assembly used by it is incompatible with llvm. # But, there is no easy way to fix it, so just exclude it since it is # useless for BPF samples.