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# iswblank.m4 serial 4
dnl Copyright (C) 2011-2020 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.
AC_DEFUN([gl_FUNC_ISWBLANK],
[
AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
AC_REQUIRE([gl_WCTYPE_H])
dnl Persuade glibc <wctype.h> to declare iswblank().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([iswblank])
AC_CHECK_DECLS([iswblank], , , [[
/* 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>
#include <wctype.h>
]])
if test $ac_cv_func_iswblank = no; then
HAVE_ISWBLANK=0
if test $ac_cv_have_decl_iswblank = yes; then
REPLACE_ISWBLANK=1
fi
fi
if test $HAVE_ISWCNTRL = 0 || test $REPLACE_ISWCNTRL = 1; then
dnl Redefine all of iswcntrl, ..., towupper in <wctype.h>.
:
else
if test $HAVE_ISWBLANK = 0 || test $REPLACE_ISWBLANK = 1; then
dnl Redefine only iswblank.
:
fi
fi
])
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