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Date:   Mon, 31 Aug 2020 16:59:28 +0200
From:   Daniel Borkmann <>
To:     Tony Ambardar <>,
        Alexei Starovoitov <>
Cc:     Andrii Nakryiko <>,,
Subject: Re: [PATCH bpf v1] libbpf: fix build failure from uninitialized
 variable warning

On 8/31/20 2:03 AM, Tony Ambardar wrote:
> 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")
> Ref: 063e68813391 ("libbpf: Fix false uninitialized variable warning")
> Signed-off-by: Tony Ambardar <>

Applied, thanks!

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