selftests/bpf: Ensure no DWARF relocations for BPF object files

Add -mattr=dwarfris attribute to llc to avoid having relocations against DWARF
data. These relocations make it impossible to inspect DWARF contents: all
strings are invalid.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191121070743.1309473-2-andriin@fb.com

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 4fe4aec0367c66ae61a5606c45cd7d0c530f096c..085678d88ef84722a559b884037db8a86ae76669 100644 (file)
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -161,7 +161,7 @@ $(OUTPUT)/flow_dissector_load.o: flow_dissector_load.h
 define CLANG_BPF_BUILD_RULE
        ($(CLANG) $3 -O2 -target bpf -emit-llvm                         \
                -c $1 -o - || echo "BPF obj compilation failed") |      \
-       $(LLC) -march=bpf -mcpu=probe $4 -filetype=obj -o $2
+       $(LLC) -mattr=dwarfris -march=bpf -mcpu=probe $4 -filetype=obj -o $2
 endef
 # Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
 define CLANG_NOALU32_BPF_BUILD_RULE