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linux: Fix i686 with gcc6

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On __convert_scm_timestamps GCC 6 issues an warning that tvts[0]/tvts[1]
maybe be used uninitialized, however it would be used if type is set to a
value different than 0 (done by either COMPAT_SO_TIMESTAMP_OLD or
COMPAT_SO_TIMESTAMPNS_OLD) which will fallthrough to 'common' label.

It does not show with gcc 7 or more recent versions.

Checked on i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella Netto 2023-07-25 12:16:40 -03:00 committed by Adhemerval Zanella
parent 0b1a76c577
commit dbc4b032dc
1 changed files with 9 additions and 0 deletions
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9
sysdeps/unix/sysv/linux/convert_scm_timestamps.c
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@ -23,6 +23,7 @@
# include <string.h>
# include <sys/socket.h>
# include <socket-constants-time64.h>
# include <libc-diag.h>
/* It converts the first SO_TIMESTAMP or SO_TIMESTAMPNS with 32-bit time and
appends it to the control buffer. The 32-bit time field is kept as-is.
@ -44,7 +45,15 @@ __convert_scm_timestamps (struct msghdr *msg, socklen_t msgsize)
'struct __kernel_sock_timeval' while for SO_TIMESTAMPNS_NEW is a
'struct __kernel_timespec'. In either case it is two uint64_t
members. */
/* GCC 6 issues an warning that tvts[0]/tvts[1] maybe be used uninitialized,
however it would be used if type is set to a value different than 0
(done by either COMPAT_SO_TIMESTAMP_OLD or COMPAT_SO_TIMESTAMPNS_OLD)
which will fallthrough to 'common' label. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (6, "-Wmaybe-uninitialized");
int64_t tvts[2];
DIAG_POP_NEEDS_COMMENT;
int32_t tmp[2];
struct cmsghdr *cmsg, *last = NULL;