2 dnl Copyright (C) 2003, 2007-2022 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
8 dnl Test whether <wchar.h> has the 'wint_t' type and whether gnulib's
9 dnl <wchar.h> or <wctype.h> would, if present, override 'wint_t'.
10 dnl Prerequisite: AC_PROG_CC
12 AC_DEFUN([gt_TYPE_WINT_T],
14 AC_CACHE_CHECK([for wint_t], [gt_cv_c_wint_t],
18 wint_t foo = (wchar_t)'\0';]],
21 [gt_cv_c_wint_t=no])])
22 if test $gt_cv_c_wint_t = yes; then
23 AC_DEFINE([HAVE_WINT_T], [1], [Define if you have the 'wint_t' type.])
25 dnl Determine whether gnulib's <wchar.h> or <wctype.h> would, if present,
26 dnl override 'wint_t'.
27 AC_CACHE_CHECK([whether wint_t is large enough],
28 [gl_cv_type_wint_t_large_enough],
32 int verify[sizeof (wint_t) < sizeof (int) ? -1 : 1];
34 [gl_cv_type_wint_t_large_enough=yes],
35 [gl_cv_type_wint_t_large_enough=no])])
36 if test $gl_cv_type_wint_t_large_enough = no; then
37 GNULIBHEADERS_OVERRIDE_WINT_T=1
39 GNULIBHEADERS_OVERRIDE_WINT_T=0
42 GNULIBHEADERS_OVERRIDE_WINT_T=0
44 AC_SUBST([GNULIBHEADERS_OVERRIDE_WINT_T])
47 dnl Prerequisites of the 'wint_t' override.
48 AC_DEFUN([gl_TYPE_WINT_T_PREREQ],
50 AC_CHECK_HEADERS_ONCE([crtdefs.h])
51 if test $ac_cv_header_crtdefs_h = yes; then
56 AC_SUBST([HAVE_CRTDEFS_H])