maint: update copyright

[gnulib.git] / m4 / timegm.m4

diff --git a/m4/timegm.m4 b/m4/timegm.m4
index a0ba0e3..f14b773 100644 (file)
--- a/m4/timegm.m4
+++ b/m4/timegm.m4
@@ -1,25 +1,26 @@
-# timegm.m4 serial 1
-dnl Copyright (C) 2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# timegm.m4 serial 11
+dnl Copyright (C) 2003, 2007, 2009-2014 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.
 
 AC_DEFUN([gl_FUNC_TIMEGM],
 [
-  AC_REPLACE_FUNCS(timegm)
-  if test $ac_cv_func_timegm = no; then
-    gl_PREREQ_TIMEGM
+  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  AC_REQUIRE([gl_FUNC_MKTIME])
+  REPLACE_TIMEGM=0
+  AC_CHECK_FUNCS_ONCE([timegm])
+  if test $ac_cv_func_timegm = yes; then
+    if test $gl_cv_func_working_mktime = no; then
+      # Assume that timegm is buggy if mktime is.
+      REPLACE_TIMEGM=1
+    fi
+  else
+    HAVE_TIMEGM=0
   fi
 ])
 
 # Prerequisites of lib/timegm.c.
 AC_DEFUN([gl_PREREQ_TIMEGM], [
-  AC_CHECK_DECLS(gmtime_r,,,[
-#ifdef HAVE_TIME_H
-#include <time.h>
-#endif
-])
-  AC_CHECK_FUNCS(gmtime_r)
+  :
 ])