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# mbswidth.m4 serial 18
dnl Copyright (C) 2000-2002, 2004, 2006-2020 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.
dnl autoconf tests required for use of mbswidth.c
dnl From Bruno Haible.
AC_DEFUN([gl_MBSWIDTH],
[
AC_CHECK_HEADERS_ONCE([wchar.h])
AC_CHECK_FUNCS_ONCE([isascii mbsinit])
dnl UnixWare 7.1.1 <wchar.h> has a declaration of a function mbswidth()
dnl that clashes with ours.
AC_CACHE_CHECK([whether mbswidth is declared in <wchar.h>],
[ac_cv_have_decl_mbswidth],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[
/* 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>
]],
[[
char *p = (char *) mbswidth;
return !p;
]])],
[ac_cv_have_decl_mbswidth=yes],
[ac_cv_have_decl_mbswidth=no])])
if test $ac_cv_have_decl_mbswidth = yes; then
ac_val=1
else
ac_val=0
fi
AC_DEFINE_UNQUOTED([HAVE_DECL_MBSWIDTH_IN_WCHAR_H], [$ac_val],
[Define to 1 if you have a declaration of mbswidth() in <wchar.h>, and to 0 otherwise.])
AC_TYPE_MBSTATE_T
])
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