bpftool: Add llvm feature to "bpftool version"

Similarly to "libbfd", add a "llvm" feature to the output of command
"bpftool version" to indicate that LLVM is used for disassembling JIT-ed
programs. This feature is mutually exclusive (from Makefile definitions)
with "libbfd".

Signed-off-by: Quentin Monnet <[email protected]>
Tested-by: Niklas Söderlund <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index b22223df4431..741e50ee0b6c 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -119,6 +119,11 @@ static int do_version(int argc, char **argv)
 #else
 	const bool has_libbfd = false;
 #endif
+#ifdef HAVE_LLVM_SUPPORT
+	const bool has_llvm = true;
+#else
+	const bool has_llvm = false;
+#endif
 #ifdef BPFTOOL_WITHOUT_SKELETONS
 	const bool has_skeletons = false;
 #else
@@ -154,6 +159,7 @@ static int do_version(int argc, char **argv)
 		jsonw_name(json_wtr, "features");
 		jsonw_start_object(json_wtr);	/* features */
 		jsonw_bool_field(json_wtr, "libbfd", has_libbfd);
+		jsonw_bool_field(json_wtr, "llvm", has_llvm);
 		jsonw_bool_field(json_wtr, "libbpf_strict", !legacy_libbpf);
 		jsonw_bool_field(json_wtr, "skeletons", has_skeletons);
 		jsonw_bool_field(json_wtr, "bootstrap", bootstrap);
@@ -172,6 +178,7 @@ static int do_version(int argc, char **argv)
 		printf("using libbpf %s\n", libbpf_version_string());
 		printf("features:");
 		print_feature("libbfd", has_libbfd, &nb_features);
+		print_feature("llvm", has_llvm, &nb_features);
 		print_feature("libbpf_strict", !legacy_libbpf, &nb_features);
 		print_feature("skeletons", has_skeletons, &nb_features);
 		print_feature("bootstrap", bootstrap, &nb_features);