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resolv: Suppress maybe uninitialized warning 

In send_vc function at resolv/res_send.c, There is the
following warning on some architectures:

  'resplen' may be used uninitialized in this function
  [-Wmaybe-uninitialized]

And this is a false positive.  This patch suppress the
compiler warning.
This commit is contained in:
Stefan Liebler 2014-12-11 07:38:01 -05:00 committed by Adhemerval Zanella
parent 9d9c0019e7
commit 48e435cd93
2 changed files with 32 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2014-12-12 Stefan Liebler <stli@linux.vnet.ibm.com>
Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* resolv/res_send.c (send_vc): Disable warning resplen may
be used uninitialized.
2014-12-12 Stefan Liebler <stli@linux.vnet.ibm.com>
* nptl/tst-mutex6.c

27
resolv/res_send.c
View File

@ -96,6 +96,7 @@ static const char rcsid[] = "$BINDId: res_send.c,v 8.38 2000/03/30 20:16:51 vixi
#include <string.h>
#include <unistd.h>
#include <kernel-features.h>
#include <libc-internal.h>
#if PACKETSZ > 65536
#define MAXPACKET PACKETSZ
@ -668,7 +669,24 @@ send_vc(res_state statp,
// int anssiz = *anssizp;
HEADER *anhp = (HEADER *) ans;
struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns];
int truncating, connreset, resplen, n;
int truncating, connreset, n;
/* On some architectures compiler might emit a warning indicating
'resplen' may be used uninitialized. However if buf2 == NULL
then this code won't be executed; if buf2 != NULL, then first
time round the loop recvresp1 and recvresp2 will be 0 so this
code won't be executed but "thisresplenp = &resplen;" followed
by "*thisresplenp = rlen;" will be executed so that subsequent
times round the loop resplen has been initialized. So this is
a false-positive.
*/
#if __GNUC_PREREQ (4, 7)
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
#endif
int resplen;
#if __GNUC_PREREQ (4, 7)
DIAG_POP_NEEDS_COMMENT;
#endif
struct iovec iov[4];
u_short len;
u_short len2;
@ -787,6 +805,10 @@ send_vc(res_state statp,
/* No buffer allocated for the first
reply. We can try to use the rest
of the user-provided buffer. */
#if __GNUC_PREREQ (4, 7)
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
#endif
#if _STRING_ARCH_unaligned
*anssizp2 = orig_anssizp - resplen;
*ansp2 = *ansp + resplen;
@ -796,6 +818,9 @@ send_vc(res_state statp,
& ~(__alignof__ (HEADER) - 1));
*anssizp2 = orig_anssizp - aligned_resplen;
*ansp2 = *ansp + aligned_resplen;
#endif
#if __GNUC_PREREQ (4, 7)
DIAG_POP_NEEDS_COMMENT;
#endif
} else {
/* The first reply did not fit into the