gcc emits the following warning:
> proto.c: In function ‘send_file_complete’:
> proto.c:437:10: error: ‘buf’ may be used uninitialized
> [-Werror=maybe-uninitialized]
> 437 | return send_file_chunk (g, 0, buf, 0);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In theory, passing the 1-byte array "buf", with indeterminate contents, to
xdr_bytes() ultimately, could be fine -- assuming xdr_bytes() never reads
the contents of the buffer, due to the buffer size being zero. However,
the xdr_bytes() manual does not seem to guarantee this (it also does not
explicitly permit passing a NULL buffer alongside size=0, which would be
even simpler for the caller).
In order to shut up the compiler, just zero-initialize the buffer --
that's simpler than adding diagnostics pragmas. The "maybe-uninitialized"
warning is otherwise very useful, so keep it globally enabled (per
WARN_CFLAGS / WERROR_CFLAGS).
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20211011223627.20856-3-lersek@redhat.com>
Acked-by: Richard W.M. Jones <rjones@redhat.com>
98ed0243e7