New module 'mbsrchr'.

[gnulib.git] / m4 / timegm.m4

diff --git a/m4/timegm.m4 b/m4/timegm.m4
index a0ba0e3..82e9d66 100644 (file)
--- a/m4/timegm.m4
+++ b/m4/timegm.m4
@@ -1,25 +1,37 @@
-# timegm.m4 serial 1
+# timegm.m4 serial 3
 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.
+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)
+  AC_REQUIRE([gl_FUNC_MKTIME])
+  if test $ac_cv_func_working_mktime = no; then
+    # Assume that timegm is buggy if mktime is.
+    AC_LIBOBJ([timegm])
+    ac_cv_func_timegm=no
+  else
+    AC_REPLACE_FUNCS(timegm)
+  fi
   if test $ac_cv_func_timegm = no; then
     gl_PREREQ_TIMEGM
   fi
+
+  AC_CHECK_DECLS([timegm], , , [#include <time.h>])
 ])
 
 # 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)
+  AC_REQUIRE([gl_TIME_R])
+  AC_REQUIRE([gl_FUNC_MKTIME])
+  if test $ac_cv_func_working_mktime = yes; then
+    AC_CHECK_FUNC(__mktime_internal, ,
+      [# mktime works but it doesn't export __mktime_internal,
+       # so we need to substitute our own mktime implementation.
+       AC_LIBOBJ([mktime])
+       AC_DEFINE([mktime], [rpl_mktime],
+        [Define to rpl_mktime if the replacement function should be used.])
+       gl_PREREQ_MKTIME])
+  fi
 ])