warn-on-use: use instead of link-warning

[pspp] / m4 / sys_select_h.m4

diff --git a/m4/sys_select_h.m4 b/m4/sys_select_h.m4
index 6ce09dbd42505a77f536c853cdb66ed3df8f403a..590554a11f285d770cdbfbdf61c907c82d930bc9 100644 (file)
--- a/m4/sys_select_h.m4
+++ b/m4/sys_select_h.m4
@@ -1,4 +1,4 @@
-# sys_select_h.m4 serial 10
+# sys_select_h.m4 serial 11
 dnl Copyright (C) 2006-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -56,6 +56,17 @@ AC_DEFUN([gl_HEADER_SYS_SELECT],
   if test $gl_cv_header_sys_select_h_selfcontained != yes; then
     gl_PREREQ_SYS_H_WINSOCK2
   fi
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[
+/* Some systems require prerequisite headers.  */
+#include <sys/types.h>
+#if !defined __GLIBC__ && HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#include <sys/select.h>
+    ]], [select])
 ])
 
 AC_DEFUN([gl_SYS_SELECT_MODULE_INDICATOR],