update copyright

[gnulib.git] / m4 / select.m4

diff --git a/m4/select.m4 b/m4/select.m4
index da266f0..037b3d3 100644 (file)
--- a/m4/select.m4
+++ b/m4/select.m4
@@ -1,5 +1,5 @@
-# select.m4 serial 3
-dnl Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+# select.m4 serial 6
+dnl Copyright (C) 2009-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -10,7 +10,7 @@ AC_DEFUN([gl_FUNC_SELECT],
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_REQUIRE([gl_SOCKETS])
   if test "$ac_cv_header_winsock2_h" = yes; then
-    AC_LIBOBJ([select])
+    REPLACE_SELECT=1
   else
     dnl On Interix 3.5, select(0, NULL, NULL, NULL, timeout) fails with error
     dnl EFAULT.
@@ -44,10 +44,32 @@ changequote([,])dnl
       ])
     case "$gl_cv_func_select_supports0" in
       *yes) ;;
-      *)
-        REPLACE_SELECT=1
-        AC_LIBOBJ([select])
+      *) REPLACE_SELECT=1 ;;
+    esac
+  fi
+
+  dnl Determine the needed libraries.
+  LIB_SELECT="$LIBSOCKET"
+  if test $REPLACE_SELECT = 1; then
+    case "$host_os" in
+      mingw*)
+        dnl On the MSVC platform, the function MsgWaitForMultipleObjects
+        dnl (used in lib/select.c) requires linking with -luser32. On mingw,
+        dnl it is implicit.
+        AC_LINK_IFELSE(
+          [AC_LANG_SOURCE([[
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+int
+main ()
+{
+  MsgWaitForMultipleObjects (0, NULL, 0, 0, 0);
+  return 0;
+}]])],
+          [],
+          [LIB_SELECT="$LIB_SELECT -luser32"])
         ;;
     esac
   fi
+  AC_SUBST([LIB_SELECT])
 ])