+ AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
+ AC_REQUIRE([gl_HEADER_NETDB])dnl for HAVE_NETDB_H
+ AC_MSG_NOTICE([checking how to do getaddrinfo, freeaddrinfo and getnameinfo])
+ GETADDRINFO_LIB=
+ gai_saved_LIBS="$LIBS"
+
+ dnl Where is getaddrinfo()?
+ dnl - On Solaris, it is in libsocket.
+ dnl - On Haiku, it is in libnetwork.
+ dnl - On BeOS, it is in libnet.
+ dnl - On native Windows, it is in ws2_32.dll.
+ dnl - Otherwise it is in libc.
+ AC_SEARCH_LIBS([getaddrinfo], [socket network net],
+ [if test "$ac_cv_search_getaddrinfo" != "none required"; then
+ GETADDRINFO_LIB="$ac_cv_search_getaddrinfo"
+ fi])
+ LIBS="$gai_saved_LIBS $GETADDRINFO_LIB"
+
+ AC_CACHE_CHECK([for getaddrinfo], [gl_cv_func_getaddrinfo], [
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#include <stddef.h>
+]], [[getaddrinfo("", "", NULL, NULL);]])],
+ [gl_cv_func_getaddrinfo=yes],
+ [gl_cv_func_getaddrinfo=no])])
+ if test $gl_cv_func_getaddrinfo = no; then
+ AC_CACHE_CHECK([for getaddrinfo in ws2tcpip.h and -lws2_32],
+ gl_cv_w32_getaddrinfo, [
+ gl_cv_w32_getaddrinfo=no
+ am_save_LIBS="$LIBS"
+ LIBS="$LIBS -lws2_32"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+#include <stddef.h>
+]], [[getaddrinfo(NULL, NULL, NULL, NULL);]])], [gl_cv_w32_getaddrinfo=yes])
+ LIBS="$am_save_LIBS"
+ ])
+ if test "$gl_cv_w32_getaddrinfo" = "yes"; then
+ GETADDRINFO_LIB="-lws2_32"
+ LIBS="$gai_saved_LIBS $GETADDRINFO_LIB"
+ else
+ AC_LIBOBJ([getaddrinfo])
+ fi
+ fi
+
+ # We can't use AC_REPLACE_FUNCS here because gai_strerror may be an
+ # inline function declared in ws2tcpip.h, so we need to get that
+ # header included somehow.
+ AC_CACHE_CHECK([for gai_strerror (possibly via ws2tcpip.h)],
+ gl_cv_func_gai_strerror, [
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+#include <stddef.h>
+]], [[gai_strerror (NULL);]])],
+ [gl_cv_func_gai_strerror=yes],
+ [gl_cv_func_gai_strerror=no])])
+ if test $gl_cv_func_gai_strerror = no; then
+ AC_LIBOBJ([gai_strerror])
+ fi
+
+ LIBS="$gai_saved_LIBS"
+