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authorJoseph Myers <joseph@codesourcery.com>2015-06-17 20:08:22 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-06-17 20:08:22 +0000
commit17c199ee92e4ca8a34a47c42924608a25a444eb2 (patch)
treeeb24c1f1561542b1540162636d5c55cb48462cbb /inet
parentc10b9b13f7471b08273effc8cd7e51b119df9348 (diff)
Fix gethostbyaddr in6addr_any, in6addr_loopback namespace (bug 18532).
gethostbyaddr brings in references to in6addr_any and thereby in6addr_loopback, which aren't in all the standards containing gethostbyaddr (gethostbyaddr is in XPG4 and UNIX98, in6addr_any and in6addr_loopback are new in POSIX.1:2001). This patch fixes this by making those symbols into weak aliases (safe in this case, unlike for most data symbols, because these data symbols are const). Tested for x86_64 and x86 (testsuite, and comparison of disassembly of installed stripped shared libraries). Disassembly is unchanged for x86_64; for x86, I see some changes of stack offsets, but no other code generation changes or code size differences. [BZ #18532] * inet/in6_addr.c (in6addr_any): Rename to __in6addr_any and define as weak alias of __in6addr_any. Use libc_hidden_data_weak. (in6addr_loopback): Rename to __in6addr_loopback and define as weak alias of __in6addr_loopback. Use libc_hidden_data_weak. * include/netinet/in.h (__in6addr_loopback): Declare. Use libc_hidden_proto. (__in6addr_any): Likewise. * inet/gethstbyad_r.c (PREPROCESS): Use __in6addr_any instead of in6addr_any. * conform/Makefile (test-xfail-XPG4/netdb.h/linknamespace): Remove variable. (test-xfail-UNIX98/netdb.h/linknamespace): Likewise.
Diffstat (limited to 'inet')
-rw-r--r--inet/gethstbyad_r.c2
-rw-r--r--inet/in6_addr.c12
2 files changed, 9 insertions, 5 deletions
diff --git a/inet/gethstbyad_r.c b/inet/gethstbyad_r.c
index 72ce441d20..06d39066c1 100644
--- a/inet/gethstbyad_r.c
+++ b/inet/gethstbyad_r.c
@@ -32,7 +32,7 @@
be performed. */
#define PREPROCESS \
if (len == sizeof (struct in6_addr) \
- && __builtin_expect (memcmp (&in6addr_any, addr, \
+ && __builtin_expect (memcmp (&__in6addr_any, addr, \
sizeof (struct in6_addr)), 1) == 0) \
{ \
*h_errnop = HOST_NOT_FOUND; \
diff --git a/inet/in6_addr.c b/inet/in6_addr.c
index 782af6443f..fb7729001d 100644
--- a/inet/in6_addr.c
+++ b/inet/in6_addr.c
@@ -18,9 +18,13 @@
#include <netinet/in.h>
-const struct in6_addr in6addr_any =
+const struct in6_addr __in6addr_any =
{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } };
-libc_hidden_data_def (in6addr_any)
-const struct in6_addr in6addr_loopback =
+libc_hidden_data_def (__in6addr_any)
+weak_alias (__in6addr_any, in6addr_any)
+libc_hidden_data_weak (in6addr_any)
+const struct in6_addr __in6addr_loopback =
{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } };
-libc_hidden_data_def (in6addr_loopback)
+libc_hidden_data_def (__in6addr_loopback)
+weak_alias (__in6addr_loopback, in6addr_loopback)
+libc_hidden_data_weak (in6addr_loopback)