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While compiling libbpf, some GCC versions (at least 8.4.0) have difficulty
determining control flow and a emit warning for potentially uninitialized
usage of 'map', which results in a build error if using "-Werror":
In file included from libbpf.c:56:
libbpf.c: In function '__bpf_object__open':
libbpf_internal.h:59:2: warning: 'map' may be used uninitialized in this function [-Wmaybe-uninitialized]
libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__); \
^~~~~~~~~~~~
libbpf.c:5032:18: note: 'map' was declared here
struct bpf_map *map, *targ_map;
^~~
The warning/error is false based on code inspection, so silence it with a
NULL initialization.
Fixes: 646f02ffdd49 ("libbpf: Add BTF-defined map-in-map support")
Reference: 063e68813391 ("libbpf: Fix false uninitialized variable warning")
Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200831000304.1696435-1-Tony.Ambardar@gmail.com
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