From 6ccfba75d3137efc3b665a337b946fd6df1162b9 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Thu, 28 Apr 2016 14:20:53 +0200 Subject: samples/bpf: add back functionality to redefine LLC command It is practical to be-able-to redefine the location of the LLVM command 'llc', because not all distros have a LLVM version with bpf target support. Thus, it is sometimes required to compile LLVM from source, and sometimes it is not desired to overwrite the distros default LLVM version. This feature was removed with 128d1514be35 ("samples/bpf: Use llc in PATH, rather than a hardcoded value"). Add this features back. Note that it is possible to redefine the LLC on the make command like: make samples/bpf/ LLC=~/git/llvm/build/bin/llc Fixes: 128d1514be35 ("samples/bpf: Use llc in PATH, rather than a hardcoded value") Signed-off-by: Jesper Dangaard Brouer Acked-by: Alexei Starovoitov Acked-by: Naveen N. Rao Signed-off-by: David S. Miller --- samples/bpf/Makefile | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'samples/bpf') diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 744dd7a16144..5bae9536f100 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -81,10 +81,14 @@ HOSTLOADLIBES_spintest += -lelf HOSTLOADLIBES_map_perf_test += -lelf -lrt HOSTLOADLIBES_test_overhead += -lelf -lrt +# Allows pointing LLC to a LLVM backend with bpf support, redefine on cmdline: +# make samples/bpf/ LLC=~/git/llvm/build/bin/llc +LLC ?= llc + # 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. $(obj)/%.o: $(src)/%.c clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \ -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \ - -O2 -emit-llvm -c $< -o -| llc -march=bpf -filetype=obj -o $@ + -O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@ -- cgit