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cygwin patch for libjava/configure.in


Rob Collins made some progress with libjava on cygwin, see
http://gcc.gnu.org/ml/java/2001-04/msg00261.html  

This patch addresses two issues in libjava:
*	posix threads on cygwin doesn't/can't link with -lpthreads.
*	autoconf detects IP6 but cygwin implementation is incomplete

I have changed the IP6 detection to use another struct defined in RFC2133.
It may be safer to look for both structs with something like

AC_TRY_COMPILE([#include <netinet/in.h>], [struct sockaddr_in6 addr6; struct
ip6_mreq mreq;],


2000-04-19  David Billinghurst <David.Billinghurst>

	* configure.in:  POSIX threads on cygwin does not link with
-lpthreads
	  Use "struct ip6_mreq mreq" rather than "struct sockaddr_in6 addr6"
	  in test for HAVE_INET6

--- libjava/configure.in.orig	Thu Apr  5 18:16:52 2001
+++ libjava/configure.in	Thu Apr 19 01:57:17 2001
@@ -314,8 +314,16 @@
 THREADSPEC=
 case "$THREADS" in
  posix)
-    THREADLIBS=-lpthread
-    THREADSPEC=-lpthread
+    case "$HOST" in
+      *-*-cygwin*)
+        THREADLIBS=
+        THREADSPEC=
+        ;;
+      *)
+        THREADLIBS=-lpthread
+        THREADSPEC=-lpthread
+        ;;
+    esac
     THREADOBJS=posix-threads.lo
     THREADH=posix-threads.h
     # MIT pthreads doesn't seem to have the mutexattr functions.
@@ -680,8 +688,8 @@
    AC_MSG_RESULT(yes)],
   [AC_MSG_RESULT(no)])
 
-AC_MSG_CHECKING([whether struct sockaddr_in6 is in netinet/in.h])
-AC_TRY_COMPILE([#include <netinet/in.h>], [struct sockaddr_in6 addr6;],
+AC_MSG_CHECKING([whether struct ip6_mreq is in netinet/in.h])
+AC_TRY_COMPILE([#include <netinet/in.h>], [struct ip6_mreq mreq;],
   [AC_DEFINE(HAVE_INET6)
    AC_MSG_RESULT(yes)],
   [AC_MSG_RESULT(no)])




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