File: timegm.m4

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# timegm.m4 serial 8
dnl Copyright (C) 2003, 2007, 2009, 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,
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])
  REPLACE_TIMEGM=0
  AC_CHECK_FUNCS_ONCE([timegm])
  if test $ac_cv_func_timegm = yes; then
    if test $ac_cv_func_working_mktime = no; then
      # Assume that timegm is buggy if mktime is.
      REPLACE_TIMEGM=1
    fi
  else
    HAVE_TIMEGM=0
  fi
  if test $HAVE_TIMEGM = 0 || test $REPLACE_TIMEGM = 1; then
    AC_LIBOBJ([timegm])
    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
])