Issue #8864: Define _XOPEN_SOURCE on Solaris for the
multiprocessing module.
diff --git a/Misc/NEWS b/Misc/NEWS
index 8d69ebe..ca113aa 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -120,7 +120,8 @@
Build
-----
-- Issue #1759169: Drop _XOPEN_SOURCE on Solaris.
+- Issues #1759169, #8864: Drop _XOPEN_SOURCE on Solaris, define it for
+ multiprocessing only.
What's New in Python 2.7 beta 2?
================================
diff --git a/Modules/_multiprocessing/multiprocessing.h b/Modules/_multiprocessing/multiprocessing.h
index c149634..14425de 100644
--- a/Modules/_multiprocessing/multiprocessing.h
+++ b/Modules/_multiprocessing/multiprocessing.h
@@ -3,6 +3,12 @@
#define PY_SSIZE_T_CLEAN
+#ifdef __sun
+/* The control message API is only available on Solaris
+ if XPG 4.2 or later is requested. */
+#define _XOPEN_SOURCE 500
+#endif
+
#include "Python.h"
#include "structmember.h"
#include "pythread.h"