1# mbswidth.m4 serial 19
2dnl Copyright (C) 2000-2002, 2004, 2006-2021 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          [[#include <wchar.h>
22          ]],
23          [[char *p = (char *) mbswidth;
24            return !p;
25          ]])],
26       [ac_cv_have_decl_mbswidth=yes],
27       [ac_cv_have_decl_mbswidth=no])])
28  if test $ac_cv_have_decl_mbswidth = yes; then
29    ac_val=1
30  else
31    ac_val=0
32  fi
33  AC_DEFINE_UNQUOTED([HAVE_DECL_MBSWIDTH_IN_WCHAR_H], [$ac_val],
34    [Define to 1 if you have a declaration of mbswidth() in <wchar.h>, and to 0 otherwise.])
35
36  AC_TYPE_MBSTATE_T
37])
38