maint: update copyright

[gnulib.git] / m4 / free.m4

diff --git a/m4/free.m4 b/m4/free.m4
index 537fb89..3587b86 100644 (file)
--- a/m4/free.m4
+++ b/m4/free.m4
@@ -1,12 +1,9 @@
 # Check whether free (NULL) is supposed to work.
 
-# Copyright (C) 2003 Free Software Foundation, Inc.
-
-# This file is free software, distributed under the terms of the GNU
-# General Public License.  As a special exception to the GNU General
-# Public License, this file may be distributed as part of a program
-# that contains a configuration script generated by Autoconf, under
-# the same distribution terms as the rest of that program.
+# Copyright (C) 2003-2005, 2009-2014 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
 
 # Written by Paul Eggert.
 
@@ -19,25 +16,27 @@
 
 AC_DEFUN([gl_FUNC_FREE],
 [
-  AC_CHECK_HEADERS_ONCE(unistd.h)
+  AC_REQUIRE([AC_CANONICAL_HOST])
   AC_CACHE_CHECK([whether free (NULL) is known to work],
     [gl_cv_func_free],
-    [AC_COMPILE_IFELSE(
-       [AC_LANG_PROGRAM(
-         [[@%:@if HAVE_UNISTD_H
-             @%:@include <unistd.h>
-           @%:@endif]],
-         [[@%:@if _POSIX_VERSION < 199009L && \
-               (defined unix || defined _unix || defined _unix_ \
-                || defined __unix || defined __unix__)
-             @%:@error "'free (NULL)' is not known to work"
-           @%:@endif]])],
-       [gl_cv_func_free=yes],
-       [gl_cv_func_free=no])])
+    [case "$host_os" in
+       mingw*) gl_cv_func_free=yes ;;
+       *)
+         AC_COMPILE_IFELSE(
+           [AC_LANG_PROGRAM(
+              [[@%:@include <unistd.h>]],
+              [[@%:@if _POSIX_VERSION < 199009L && \
+                    (defined unix || defined _unix || defined _unix_ \
+                     || defined __unix || defined __unix__)
+                  @%:@error "'free (NULL)' is not known to work"
+                @%:@endif]])],
+           [gl_cv_func_free=yes],
+           [gl_cv_func_free=no])
+     esac
+    ])
 
-  if test $gl_cv_func_free = yes; then
-    AC_LIBOBJ(free)
-    AC_DEFINE(free, rpl_free,
+  if test $gl_cv_func_free = no; then
+    AC_DEFINE([free], [rpl_free],
       [Define to rpl_free if the replacement function should be used.])
   fi
 ])