[PATCH 2/2] perf tools: Add weak variants for the deprecated libbpf functions

[Jiri Olsa <jolsa@redhat.com>]

Adding weak functions for deprecated libbpf functions, so that
we don't get build fail with libbpf version where they are
finally removed.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/bpf-event.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index ceb96360fd12..476427f3e804 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -22,6 +22,20 @@
 #include "record.h"
 #include "util/synthetic-events.h"
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wredundant-decls"
+int btf__get_from_id(__u32 id, struct btf **btf);
+struct bpf_program *bpf_program__next(struct bpf_program *prog,
+				      const struct bpf_object *obj);
+struct bpf_map *bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj);
+const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
+#pragma GCC diagnostic pop
+
+int __weak btf__get_from_id(__u32 id __maybe_unused, struct btf **btf __maybe_unused)
+{
+	return -ENOTSUP;
+}
+
 struct btf * __weak btf__load_from_kernel_by_id(__u32 id)
 {
        struct btf *btf;
@@ -33,6 +47,13 @@ struct btf * __weak btf__load_from_kernel_by_id(__u32 id)
        return err ? ERR_PTR(err) : btf;
 }
 
+struct bpf_program * __weak
+bpf_program__next(struct bpf_program *prog __maybe_unused,
+		  const struct bpf_object *obj __maybe_unused)
+{
+	return NULL;
+}
+
 struct bpf_program * __weak
 bpf_object__next_program(const struct bpf_object *obj, struct bpf_program *prev)
 {
@@ -42,6 +63,12 @@ bpf_object__next_program(const struct bpf_object *obj, struct bpf_program *prev)
 #pragma GCC diagnostic pop
 }
 
+struct bpf_map * __weak bpf_map__next(const struct bpf_map *map __maybe_unused,
+				      const struct bpf_object *obj __maybe_unused)
+{
+	return NULL;
+}
+
 struct bpf_map * __weak
 bpf_object__next_map(const struct bpf_object *obj, const struct bpf_map *prev)
 {
@@ -51,6 +78,12 @@ bpf_object__next_map(const struct bpf_object *obj, const struct bpf_map *prev)
 #pragma GCC diagnostic pop
 }
 
+const void * __weak btf__get_raw_data(const struct btf *btf __maybe_unused,
+				      __u32 *size __maybe_unused)
+{
+	return NULL;
+}
+
 const void * __weak
 btf__raw_data(const struct btf *btf_ro, __u32 *size)
 {
-- 
2.31.1