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libbpf: Silence uninitialized warning/error in btf_dump_dump_type_data

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When compiling libbpf with gcc 4.8.5, we see:

  CC       staticobjs/btf_dump.o
btf_dump.c: In function ‘btf_dump_dump_type_data.isra.24’:
btf_dump.c:2296:5: error: ‘err’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  if (err < 0)
     ^
cc1: all warnings being treated as errors
make: *** [staticobjs/btf_dump.o] Error 1

While gcc 4.8.5 is too old to build the upstream kernel, it's possible it
could be used to build standalone libbpf which suffers from the same problem.
Silence the error by initializing 'err' to 0.  The warning/error seems to be
a false positive since err is set early in the function.  Regardless we
shouldn't prevent libbpf from building for this.

Fixes: 920d16af9b ("libbpf: BTF dumper support for typed data")
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1638180040-8037-1-git-send-email-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire 2021-11-29 10:00:40 +00:00 committed by Andrii Nakryiko
parent da61e9e3ae
commit 43174f0d45
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/btf_dump.c
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@ -2216,7 +2216,7 @@ static int btf_dump_dump_type_data(struct btf_dump *d,
__u8 bits_offset, __u8 bits_offset,
__u8 bit_sz) __u8 bit_sz)
{ {
int size, err; int size, err = 0;
size = btf_dump_type_data_check_overflow(d, t, id, data, bits_offset); size = btf_dump_type_data_check_overflow(d, t, id, data, bits_offset);
if (size < 0) if (size < 0)