From 63f19278b998b8145269662cc5a256020f6530bd Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Mon, 24 Apr 2017 17:12:16 +0200
Subject: cygwin: wincap: fix evaluation of build number

RtlGetNtVersionNumbers returns the build number with some upper bits
set for no apparent reason.  The fact that RtlGetNtVersionNumbers is
undocumented doesn't exactly help.

Just filter out the upper WORD for now.  If build numbers are in
danger to become 6 digit numbers, re-evaluate.
---
 winsup/cygwin/wincap.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/winsup/cygwin/wincap.cc b/winsup/cygwin/wincap.cc
index cb52aad6f..c8799f3ec 100644
--- a/winsup/cygwin/wincap.cc
+++ b/winsup/cygwin/wincap.cc
@@ -118,6 +118,7 @@ wincapc::init ()
   RtlGetNtVersionNumbers (&version.dwMajorVersion,
 			  &version.dwMinorVersion,
 			  &version.dwBuildNumber);
+  version.dwBuildNumber &= 0xffff;
 
   switch (version.dwMajorVersion)
     {
-- 
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