[RFC bpf-next 07/12] bpftool: Enable header guards generation

[Eduard Zingerman <eddyz87@gmail.com>]

Enables header guards generation for BTF dumps in C format, e.g.
vmlinux.h would be printed as follows:

  ...
  #ifndef _UAPI_LINUX_TCP_H

  enum {
    TCP_NO_QUEUE = 0,
    TCP_RECV_QUEUE = 1,
    TCP_SEND_QUEUE = 2,
    TCP_QUEUES_NR = 3,
  };

  #endif /* _UAPI_LINUX_TCP_H */
  ...

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 tools/bpf/bpftool/btf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index 68a70ac03c80..f8e8946b61a7 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -466,7 +466,9 @@ static int dump_btf_c(const struct btf *btf,
 	struct btf_dump *d;
 	int err = 0, i;
 
-	d = btf_dump__new(btf, btf_dump_printf, NULL, NULL);
+	LIBBPF_OPTS(btf_dump_opts, opts);
+	opts.emit_header_guards = true;
+	d = btf_dump__new(btf, btf_dump_printf, NULL, &opts);
 	err = libbpf_get_error(d);
 	if (err)
 		return err;
-- 
2.34.1