# wint_t.m4 serial 8

dnl Copyright (C) 2003, 2007-2020 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 From Bruno Haible.

dnl Test whether <wchar.h> has the 'wint_t' type and whether gnulib's

dnl <wchar.h> or <wctype.h> would, if present, override 'wint_t'.

dnl Prerequisite: AC_PROG_CC

AC_DEFUN([gt_TYPE_WINT_T],

[

  AC_CACHE_CHECK([for wint_t], [gt_cv_c_wint_t],

    [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>

            wint_t foo = (wchar_t)'\0';]],

          [[]])],

       [gt_cv_c_wint_t=yes],

       [gt_cv_c_wint_t=no])])

  if test $gt_cv_c_wint_t = yes; then

    AC_DEFINE([HAVE_WINT_T], [1], [Define if you have the 'wint_t' type.])

    dnl Determine whether gnulib's <wchar.h> or <wctype.h> would, if present,

    dnl override 'wint_t'.

    AC_CACHE_CHECK([whether wint_t is too small],

      [gl_cv_type_wint_t_too_small],

      [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>.  */

#if !(defined __GLIBC__ && !defined __UCLIBC__)

# include <stddef.h>

# include <stdio.h>

# include <time.h>

#endif

#include <wchar.h>

            int verify[sizeof (wint_t) < sizeof (int) ? -1 : 1];

            ]])],

         [gl_cv_type_wint_t_too_small=no],

         [gl_cv_type_wint_t_too_small=yes])])

    if test $gl_cv_type_wint_t_too_small = yes; then

      GNULIB_OVERRIDES_WINT_T=1

    else

      GNULIB_OVERRIDES_WINT_T=0

    fi

  else

    GNULIB_OVERRIDES_WINT_T=0

  fi

  AC_SUBST([GNULIB_OVERRIDES_WINT_T])

])

dnl Prerequisites of the 'wint_t' override.

AC_DEFUN([gl_TYPE_WINT_T_PREREQ],

[

  AC_CHECK_HEADERS_ONCE([crtdefs.h])

  if test $ac_cv_header_crtdefs_h = yes; then

    HAVE_CRTDEFS_H=1

  else

    HAVE_CRTDEFS_H=0

  fi

  AC_SUBST([HAVE_CRTDEFS_H])

])