1# iswblank.m4 serial 4
2dnl Copyright (C) 2011-2012 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_ISWBLANK],
8[
9  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
10  AC_REQUIRE([gl_WCTYPE_H])
11  dnl Persuade glibc <wctype.h> to declare iswblank().
12  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
13  AC_CHECK_FUNCS_ONCE([iswblank])
14  AC_CHECK_DECLS([iswblank], , , [[
15/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
16   <wchar.h>.
17   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
18   before <wchar.h>.  */
19#include <stddef.h>
20#include <stdio.h>
21#include <time.h>
22#include <wchar.h>
23#include <wctype.h>
24]])
25  if test $ac_cv_func_iswblank = no; then
26    HAVE_ISWBLANK=0
27    if test $ac_cv_have_decl_iswblank = yes; then
28      REPLACE_ISWBLANK=1
29    fi
30  fi
31  if test $HAVE_ISWCNTRL = 0 || test $REPLACE_ISWCNTRL = 1; then
32    dnl Redefine all of iswcntrl, ..., towupper in <wctype.h>.
33    :
34  else
35    if test $HAVE_ISWBLANK = 0 || test $REPLACE_ISWBLANK = 1; then
36      dnl Redefine only iswblank.
37      :
38    fi
39  fi
40
41])
42