[PATCH v1 02/13] libbpf: Make __printf define conditional

[Ian Rogers]

libbpf depends upon linux/err.h which has a linux/compiler.h
dependency. In the kernel includes, as opposed to the tools version,
linux/compiler.h includes linux/compiler_attributes.h which defines
__printf. As the libbpf.c __printf definition isn't guarded by an
ifndef, this leads to a duplicate definition compilation error when
trying to update the tools/include/linux/compiler.h. Fix this by
adding the missing ifndef.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/lib/bpf/libbpf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index afd09571c482..2152360b4b18 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -66,7 +66,9 @@
  */
 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
 
-#define __printf(a, b)	__attribute__((format(printf, a, b)))
+#ifndef __printf
+# define __printf(a, b)	__attribute__((format(printf, a, b)))
+#endif
 
 static struct bpf_map *bpf_object__add_map(struct bpf_object *obj);
 static bool prog_is_subprog(const struct bpf_object *obj, const struct bpf_program *prog);
-- 
2.44.0.278.ge034bb2e1d-goog