1# wcwidth.m4 serial 8
2dnl Copyright (C) 2006, 2007 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
7AC_DEFUN([gl_FUNC_WCWIDTH],
8[
9  dnl Persuade glibc <wchar.h> to declare wcwidth().
10  AC_REQUIRE([AC_GNU_SOURCE])
11
12  AC_REQUIRE([AC_C_INLINE])
13  AC_REQUIRE([gt_TYPE_WCHAR_T])
14  AC_REQUIRE([gt_TYPE_WINT_T])
15
16  AC_CHECK_HEADERS_ONCE([wchar.h])
17  AC_CHECK_FUNCS_ONCE([wcwidth])
18
19  AC_CHECK_DECLS([wcwidth], [], [], [
20/* AIX 3.2.5 declares wcwidth in <string.h>. */
21#include <string.h>
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