Undefine addrinfo.h constants if the system header defined them.
Fixes #486099.
diff --git a/Modules/addrinfo.h b/Modules/addrinfo.h
index 686a4b8..7f85d81 100644
--- a/Modules/addrinfo.h
+++ b/Modules/addrinfo.h
@@ -32,7 +32,29 @@
/*
* Error return codes from getaddrinfo()
*/
-#ifndef EAI_ADDRFAMILY
+#ifdef EAI_ADDRFAMILY
+/* If this is defined, there is a conflicting implementation
+ in the C library, which can't be used for some reason.
+ Make sure it won't interfere with this emulation. */
+
+#undef EAI_ADDRFAMILY
+#undef EAI_AGAIN
+#undef EAI_BADFLAGS
+#undef EAI_FAIL
+#undef EAI_FAMILY
+#undef EAI_MEMORY
+#undef EAI_NODATA
+#undef EAI_NONAME
+#undef EAI_SERVICE
+#undef EAI_SOCKTYPE
+#undef EAI_SYSTEM
+#undef EAI_BADHINTS
+#undef EAI_PROTOCOL
+#undef EAI_MAX
+#undef getaddrinfo
+#define getaddrinfo fake_getaddrinfo
+#endif
+
#define EAI_ADDRFAMILY 1 /* address family for hostname not supported */
#define EAI_AGAIN 2 /* temporary failure in name resolution */
#define EAI_BADFLAGS 3 /* invalid value for ai_flags */
@@ -47,12 +69,22 @@
#define EAI_BADHINTS 12
#define EAI_PROTOCOL 13
#define EAI_MAX 14
-#endif
/*
* Flag values for getaddrinfo()
*/
-#ifndef AI_PASSIVE
+#ifdef AI_PASSIVE
+#undef AI_PASSIVE
+#undef AI_CANONNAME
+#undef AI_NUMERICHOST
+#undef AI_MASK
+#undef AI_ALL
+#undef AI_V4MAPPED_CFG
+#undef AI_ADDRCONFIG
+#undef AI_V4MAPPED
+#undef AI_DEFAULT
+#endif
+
#define AI_PASSIVE 0x00000001 /* get address to use bind() */
#define AI_CANONNAME 0x00000002 /* fill ai_canonname */
#define AI_NUMERICHOST 0x00000004 /* prevent name resolution */
@@ -65,7 +97,6 @@
#define AI_V4MAPPED 0x00000800 /* accept IPv4-mapped IPv6 address */
/* special recommended flags for getipnodebyname */
#define AI_DEFAULT (AI_V4MAPPED_CFG | AI_ADDRCONFIG)
-#endif
#endif /* HAVE_GETADDRINFO */