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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_decl_wchar_max.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_DECL_WCHAR_MAX
#
# DESCRIPTION
#
# Checks whether the system headers define WCHAR_MAX or not. If it is
# already defined, does nothing. Otherwise checks the size and signedness
# of `wchar_t', and defines WCHAR_MAX to the maximum value that can be
# stored in a variable of type `wchar_t'.
#
# LICENSE
#
# Copyright (c) 2008 Ville Laurikari <vl@iki.fi>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 8
AU_ALIAS([VL_DECL_WCHAR_MAX], [AX_DECL_WCHAR_MAX])
AC_DEFUN([AX_DECL_WCHAR_MAX], [
AC_CACHE_CHECK([whether WCHAR_MAX is defined], ax_cv_decl_wchar_max, [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifdef HAVE_WCHAR_H
#include <wchar.h>
#endif
]], [[WCHAR_MAX]])], [ax_cv_decl_wchar_max="yes"], [ax_cv_decl_wchar_max="no"])])
if test $ax_cv_decl_wchar_max = "no"; then
AX_CHECK_SIGN([wchar_t],
[ wc_signed="yes"
AC_DEFINE(WCHAR_T_SIGNED, 1, [Define if wchar_t is signed]) ],
[ wc_signed="no"
AC_DEFINE(WCHAR_T_UNSIGNED, 1, [Define if wchar_t is unsigned])], [
#ifdef HAVE_WCHAR_H
#include <wchar.h>
#endif
])
if test "$wc_signed" = "yes"; then
AC_DEFINE(WCHAR_MAX, [(1L << (sizeof(wchar_t) * 8 - 1) - 1)], [
Define to the maximum value of wchar_t if not already defined elsewhere])
elif test "$wc_signed" = "no"; then
AC_DEFINE(WCHAR_MAX, [(1L << (sizeof(wchar_t) * 8) - 1)])
fi
fi
])dnl
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