1# mbswidth.m4 serial 18
2dnl Copyright (C) 2000-2002, 2004, 2006-2020 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl autoconf tests required for use of mbswidth.c
8dnl From Bruno Haible.
9
10AC_DEFUN([gl_MBSWIDTH],
11[
12  AC_CHECK_HEADERS_ONCE([wchar.h])
13  AC_CHECK_FUNCS_ONCE([isascii mbsinit])
14
15  dnl UnixWare 7.1.1 <wchar.h> has a declaration of a function mbswidth()
16  dnl that clashes with ours.
17  AC_CACHE_CHECK([whether mbswidth is declared in <wchar.h>],
18    [ac_cv_have_decl_mbswidth],
19    [AC_COMPILE_IFELSE(
20       [AC_LANG_PROGRAM(
21          [[
22/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
23   <wchar.h>.
24   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
25   before <wchar.h>.  */
26#include <stddef.h>
27#include <stdio.h>
28#include <time.h>
29#include <wchar.h>
30          ]],
31          [[
32  char *p = (char *) mbswidth;
33  return !p;
34          ]])],
35       [ac_cv_have_decl_mbswidth=yes],
36       [ac_cv_have_decl_mbswidth=no])])
37  if test $ac_cv_have_decl_mbswidth = yes; then
38    ac_val=1
39  else
40    ac_val=0
41  fi
42  AC_DEFINE_UNQUOTED([HAVE_DECL_MBSWIDTH_IN_WCHAR_H], [$ac_val],
43    [Define to 1 if you have a declaration of mbswidth() in <wchar.h>, and to 0 otherwise.])
44
45  AC_TYPE_MBSTATE_T
46])
47