getaddrinfo: fix gai_strerror signature

[gnulib.git] / m4 / getaddrinfo.m4

diff --git a/m4/getaddrinfo.m4 b/m4/getaddrinfo.m4
index e576236..f29e903 100644 (file)
--- a/m4/getaddrinfo.m4
+++ b/m4/getaddrinfo.m4
@@ -1,4 +1,4 @@
-# getaddrinfo.m4 serial 24
+# getaddrinfo.m4 serial 25
 dnl Copyright (C) 2004-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -62,9 +62,7 @@ AC_DEFUN([gl_GETADDRINFO],
   # 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([[
+  AC_CHECK_DECLS([gai_strerror, gai_strerrorA], [], [break], [[
 #include <sys/types.h>
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
@@ -76,11 +74,32 @@ AC_DEFUN([gl_GETADDRINFO],
 #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
+]])
+  if test $ac_cv_have_decl_gai_strerror = no; then
     AC_LIBOBJ([gai_strerror])
+  else
+    dnl check for correct signature
+    AC_CACHE_CHECK([for gai_strerror with POSIX signature],
+     [gl_cv_func_gai_strerror_posix_signature], [
+      AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#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>
+extern const char *gai_strerror(int);]])],
+        [gl_cv_func_gai_strerror_posix_signature=yes],
+        [gl_cv_func_gai_strerror_posix_signature=no])])
+    if test $gl_cv_func_gai_strerror_posix_signature = no; then
+      REPLACE_GAI_STRERROR=1
+      AC_LIBOBJ([gai_strerror])
+    fi
   fi
 
   LIBS="$gai_saved_LIBS"
@@ -112,7 +131,7 @@ AC_DEFUN([gl_PREREQ_GETADDRINFO], [
 
   AC_CHECK_HEADERS_ONCE([netinet/in.h])
 
-  AC_CHECK_DECLS([getaddrinfo, freeaddrinfo, gai_strerror, getnameinfo],,,[
+  AC_CHECK_DECLS([getaddrinfo, freeaddrinfo, getnameinfo],,,[
   /* sys/types.h is not needed according to POSIX, but the
      sys/socket.h in i386-unknown-freebsd4.10 and
      powerpc-apple-darwin5.5 required it. */