1 files changed, 40 insertions, 0 deletions

diff --git a/gl/m4/timegm.m4 b/gl/m4/timegm.m4
new file mode 100644
index 00000000..be323c9b
--- /dev/null
+++ b/gl/m4/timegm.m4
@@ -0,0 +1,40 @@
+# timegm.m4 serial 6
+dnl Copyright (C) 2003, 2007, 2009 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_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+  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
+  REPLACE_TIMEGM=1
+  if test $ac_cv_func_timegm = yes; then
+    AC_CHECK_DECLS([timegm], [REPLACE_TIMEGM=0], [], [#include <time.h>])
+  fi
+  if test $REPLACE_TIMEGM = 1; then
+    gl_PREREQ_TIMEGM
+  fi
+])
+
+# Prerequisites of lib/timegm.c.
+AC_DEFUN([gl_PREREQ_TIMEGM], [
+  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
+])