# mbstate_t.m4 serial 13

dnl Copyright (C) 2000-2002, 2008-2019 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.

# From Paul Eggert.

# BeOS 5 has <wchar.h> but does not define mbstate_t,

# so you can't declare an object of that type.

# Check for this incompatibility with Standard C.

# AC_TYPE_MBSTATE_T

# -----------------

AC_DEFUN([AC_TYPE_MBSTATE_T],

[

   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) dnl for HP-UX 11.11

   AC_CACHE_CHECK([for mbstate_t], [ac_cv_type_mbstate_t],

     [AC_COMPILE_IFELSE(

        [AC_LANG_PROGRAM(

           [AC_INCLUDES_DEFAULT[

/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before

   <wchar.h>.

   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be

   included before <wchar.h>.  */

#include <stddef.h>

#include <stdio.h>

#include <time.h>

#include <wchar.h>]],

           [[mbstate_t x; return sizeof x;]])],

        [ac_cv_type_mbstate_t=yes],

        [ac_cv_type_mbstate_t=no])])

   if test $ac_cv_type_mbstate_t = yes; then

     AC_DEFINE([HAVE_MBSTATE_T], [1],

               [Define to 1 if <wchar.h> declares mbstate_t.])

   else

     AC_DEFINE([mbstate_t], [int],

               [Define to a type if <wchar.h> does not define.])

   fi

])