Windows: fix IPv6 split-stack support

Some builds of MinGW do not define IPV6_V6ONLY socket option.

  This is an iCelero project

diff --git a/compat/os/mswin.h b/compat/os/mswin.h
index c23c4d9e3d5f67819fd0df6beea85bb58c4478eb..d61e3f2b5b00e9aca98fee10aeb4e540d3a15a1a 100644 (file)
--- a/compat/os/mswin.h
+++ b/compat/os/mswin.h
@@ -51,6 +51,11 @@
 #define NOMINMAX
 #endif
 
+/// some builds of MinGW do not define IPV6_V6ONLY socket option
+#if !defined(IPV6_V6ONLY)
+#define IPV6_V6ONLY 27
+#endif
+
 #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
 # define __USE_FILE_OFFSET64   1
 #endif