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authorYonghong Song <yhs@fb.com>2018-11-20 02:29:17 +0300
committerAlexei Starovoitov <ast@kernel.org>2018-11-20 21:54:39 +0300
commit9ce6ae22c8e878aee7a96836b2ed9fd9a8173e41 (patch)
tree7d5c7b5ff4e40aada9e845f577315c5d5fb37e6f /samples
parent2993e0515bb44e157c17c9ba7309ba46366b6add (diff)
downloadlinux-9ce6ae22c8e878aee7a96836b2ed9fd9a8173e41.tar.xz
tools/bpf: do not use pahole if clang/llvm can generate BTF sections
Add additional checks in tools/testing/selftests/bpf and samples/bpf such that if clang/llvm compiler can generate BTF sections, do not use pahole. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/Makefile8
1 files changed, 8 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index be0a961450bc..35444f4a846b 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -208,12 +208,20 @@ endif
BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
+BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
+ $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
+ readelf -S ./llvm_btf_verify.o | grep BTF; \
+ /bin/rm -f ./llvm_btf_verify.o)
+ifneq ($(BTF_LLVM_PROBE),)
+ EXTRA_CFLAGS += -g
+else
ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),)
EXTRA_CFLAGS += -g
LLC_FLAGS += -mattr=dwarfris
DWARF2BTF = y
endif
+endif
# Trick to allow make to be run from this directory
all: