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Commit 7b01dd57 authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by David S. Miller
Browse files

samples/bpf: Makefile verify LLVM compiler avail and bpf target is supported 



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: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6ccfba75

samples/bpf/Makefile

+18 −0
Original line number Diff line number Diff line
@@ -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.