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| author | Jesper Dangaard Brouer <brouer@redhat.com> | 2016-04-28 14:20:53 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-29 14:25:32 -0400 |
| commit | 6ccfba75d3137efc3b665a337b946fd6df1162b9 (patch) | |
| tree | 15cebd90b5049e5a8fde9c852f2d1630bf93f988 /samples | |
| parent | c23846c143e81963096e922d91b7b00284c22bed (diff) | |
| download | lwn-6ccfba75d3137efc3b665a337b946fd6df1162b9.tar.gz lwn-6ccfba75d3137efc3b665a337b946fd6df1162b9.zip | |
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 <brouer@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/Makefile | 6 |
1 files changed, 5 insertions, 1 deletions
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 $@ |