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

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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 <brouer@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2016-04-28 14:20:58 +02:00 committed by David S. Miller
parent 6ccfba75d3
commit 7b01dd5793
1 changed files with 18 additions and 0 deletions
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18
samples/bpf/Makefile
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@ -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.