gnulib/import/m4/mbstate_t.m4

   1 # mbstate_t.m4 serial 13
   2 dnl Copyright (C) 2000-2002, 2008-2016 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 # From Paul Eggert.
   8
   9 # BeOS 5 has <wchar.h> but does not define mbstate_t,
  10 # so you can't declare an object of that type.
  11 # Check for this incompatibility with Standard C.
  12
  13 # AC_TYPE_MBSTATE_T
  14 # -----------------
  15 AC_DEFUN([AC_TYPE_MBSTATE_T],
  16 [
  17    AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) dnl for HP-UX 11.11
  18
  19    AC_CACHE_CHECK([for mbstate_t], [ac_cv_type_mbstate_t],
  20      [AC_COMPILE_IFELSE(
  21         [AC_LANG_PROGRAM(
  22            [AC_INCLUDES_DEFAULT[
  23 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  24    <wchar.h>.
  25    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  26    included before <wchar.h>.  */
  27 #include <stddef.h>
  28 #include <stdio.h>
  29 #include <time.h>
  30 #include <wchar.h>]],
  31            [[mbstate_t x; return sizeof x;]])],
  32         [ac_cv_type_mbstate_t=yes],
  33         [ac_cv_type_mbstate_t=no])])
  34    if test $ac_cv_type_mbstate_t = yes; then
  35      AC_DEFINE([HAVE_MBSTATE_T], [1],
  36                [Define to 1 if <wchar.h> declares mbstate_t.])
  37    else
  38      AC_DEFINE([mbstate_t], [int],
  39                [Define to a type if <wchar.h> does not define.])
  40    fi
  41 ])