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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: vl_decl_wchar_max
</title>
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<hr>
<h1>
vl_decl_wchar_max
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>VL_DECL_WCHAR_MAX</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
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'.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Ville Laurikari <vl@iki.fi>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2002-04-04
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([VL_DECL_WCHAR_MAX], [
AC_CACHE_CHECK([whether WCHAR_MAX is defined], vl_cv_decl_wchar_max, [
AC_TRY_COMPILE([
#ifdef HAVE_WCHAR_H
#include <wchar.h>
#endif
],[WCHAR_MAX],[vl_cv_decl_wchar_max="yes"],[vl_cv_decl_wchar_max="no"])])
if test $vl_cv_decl_wchar_max = "no"; then
VL_CHECK_SIGN([wchar_t],
[ wc_signed="yes"
AC_DEFINE(WCHAR_T_SIGNED, 1, [Define if wchar_t is signed]) ],
[ wc_signed="no"
AC_DEFINE(WCHAR_T_UNSIGNED, 1, [Define if wchar_t is unsigned])], [
#ifdef HAVE_WCHAR_H
#include <wchar.h>
#endif
])
if test "$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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