sync code with last improvements from OpenBSD

app/luit/acinclude.m4

@@ -0,0 +1,116 @@
+dnl ---------------------------------------------------------------------------
+dnl
+dnl Copyright 2006-2009,2010 by Thomas E. Dickey
+dnl
+dnl                         All Rights Reserved
+dnl
+dnl Permission to use, copy, modify, and distribute this software and its
+dnl documentation for any purpose and without fee is hereby granted,
+dnl provided that the above copyright notice appear in all copies and that
+dnl both that copyright notice and this permission notice appear in
+dnl supporting documentation, and that the name of the above listed
+dnl copyright holder(s) not be used in advertising or publicity pertaining
+dnl to distribution of the software without specific, written prior
+dnl permission.
+dnl
+dnl THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM ALL WARRANTIES WITH REGARD
+dnl TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+dnl AND FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE
+dnl LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+dnl WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+dnl ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+dnl OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+dnl
+dnl ---------------------------------------------------------------------------
+
+dnl ---------------------------------------------------------------------------
+dnl CF_FUNC_POLL version: 4 updated: 2006/12/16 12:33:30
+dnl ------------
+dnl See if the poll function really works.  Some platforms have poll(), but
+dnl it does not work for terminals or files.
+AC_DEFUN([CF_FUNC_POLL],[
+AC_CACHE_CHECK(if poll really works,cf_cv_working_poll,[
+AC_TRY_RUN([
+#include <stdio.h>
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#else
+#include <sys/poll.h>
+#endif
+int main() {
+	struct pollfd myfds;
+	int ret;
+
+	myfds.fd = 0;
+	myfds.events = POLLIN;
+
+	ret = poll(&myfds, 1, 100);
+	${cf_cv_main_return:-return}(ret != 0);
+}],
+	[cf_cv_working_poll=yes],
+	[cf_cv_working_poll=no],
+	[cf_cv_working_poll=unknown])])
+test "$cf_cv_working_poll" = "yes" && AC_DEFINE(HAVE_WORKING_POLL, 1, [poll() works])
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl CF_SIGWINCH version: 1 updated: 2006/04/02 16:41:09
+dnl -----------
+dnl Use this macro after CF_XOPEN_SOURCE, but do not require it (not all
+dnl programs need this test).
+dnl
+dnl This is really a MacOS X 10.4.3 workaround.  Defining _POSIX_C_SOURCE
+dnl forces SIGWINCH to be undefined (breaks xterm, ncurses).  Oddly, the struct
+dnl winsize declaration is left alone - we may revisit this if Apple choose to
+dnl break that part of the interface as well.
+AC_DEFUN([CF_SIGWINCH],
+[
+AC_CACHE_CHECK(if SIGWINCH is defined,cf_cv_define_sigwinch,[
+	AC_TRY_COMPILE([
+#include <sys/types.h>
+#include <sys/signal.h>
+],[int x = SIGWINCH],
+	[cf_cv_define_sigwinch=yes],
+	[AC_TRY_COMPILE([
+#undef _XOPEN_SOURCE
+#undef _POSIX_SOURCE
+#undef _POSIX_C_SOURCE
+#include <sys/types.h>
+#include <sys/signal.h>
+],[int x = SIGWINCH],
+	[cf_cv_define_sigwinch=maybe],
+	[cf_cv_define_sigwinch=no])
+])
+])
+
+if test "$cf_cv_define_sigwinch" = maybe ; then
+AC_CACHE_CHECK(for actual SIGWINCH definition,cf_cv_fixup_sigwinch,[
+cf_cv_fixup_sigwinch=unknown
+cf_sigwinch=32
+while test $cf_sigwinch != 1
+do
+	AC_TRY_COMPILE([
+#undef _XOPEN_SOURCE
+#undef _POSIX_SOURCE
+#undef _POSIX_C_SOURCE
+#include <sys/types.h>
+#include <sys/signal.h>
+],[
+#if SIGWINCH != $cf_sigwinch
+make an error
+#endif
+int x = SIGWINCH],
+	[cf_cv_fixup_sigwinch=$cf_sigwinch
+	 break])
+
+cf_sigwinch=`expr $cf_sigwinch - 1`
+done
+])
+
+	if test "$cf_cv_fixup_sigwinch" != unknown ; then
+		CPPFLAGS="$CPPFLAGS -DSIGWINCH=$cf_cv_fixup_sigwinch"
+	fi
+fi
+])dnl
+
+