From 2d7102e726e973ab2d307aa9748c7ec433677877 Mon Sep 17 00:00:00 2001
From: Thomas Herzog <thomas@mcduke.net>
Date: Sun, 2 Sep 2018 00:13:57 +0200
Subject: [PATCH] closes bpo-34555: Fix incorrectly nested test for
 HAVE_LINUX_VM_SOCKETS_H (GH-9016)

---
 .../2018-08-31-19-41-09.bpo-34555.dfQcnm.rst  |  2 +
 Modules/socketmodule.h                        | 53 ++++++++++---------
 2 files changed, 29 insertions(+), 26 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Build/2018-08-31-19-41-09.bpo-34555.dfQcnm.rst

diff --git a/Misc/NEWS.d/next/Build/2018-08-31-19-41-09.bpo-34555.dfQcnm.rst b/Misc/NEWS.d/next/Build/2018-08-31-19-41-09.bpo-34555.dfQcnm.rst
new file mode 100644
index 00000000000..7e61c4fb20a
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2018-08-31-19-41-09.bpo-34555.dfQcnm.rst
@@ -0,0 +1,2 @@
+Fix for case where it was not possible to have both
+``HAVE_LINUX_VM_SOCKETS_H`` and ``HAVE_SOCKADDR_ALG`` be undefined.
diff --git a/Modules/socketmodule.h b/Modules/socketmodule.h
index bce74c3da8f..0b2edc15878 100644
--- a/Modules/socketmodule.h
+++ b/Modules/socketmodule.h
@@ -101,39 +101,40 @@ typedef int socklen_t;
 #include <sys/kern_control.h>
 #endif
 
-#ifdef HAVE_SOCKADDR_ALG
-#include <linux/if_alg.h>
-#ifndef AF_ALG
-#define AF_ALG 38
-#endif
-#ifndef SOL_ALG
-#define SOL_ALG 279
-#endif
-
 #ifdef HAVE_LINUX_VM_SOCKETS_H
 # include <linux/vm_sockets.h>
 #else
 # undef AF_VSOCK
 #endif
 
-/* Linux 3.19 */
-#ifndef ALG_SET_AEAD_ASSOCLEN
-#define ALG_SET_AEAD_ASSOCLEN           4
-#endif
-#ifndef ALG_SET_AEAD_AUTHSIZE
-#define ALG_SET_AEAD_AUTHSIZE           5
-#endif
-/* Linux 4.8 */
-#ifndef ALG_SET_PUBKEY
-#define ALG_SET_PUBKEY                  6
-#endif
+#ifdef HAVE_SOCKADDR_ALG
 
-#ifndef ALG_OP_SIGN
-#define ALG_OP_SIGN                     2
-#endif
-#ifndef ALG_OP_VERIFY
-#define ALG_OP_VERIFY                   3
-#endif
+# include <linux/if_alg.h>
+# ifndef AF_ALG
+#  define AF_ALG 38
+# endif
+# ifndef SOL_ALG
+#  define SOL_ALG 279
+# endif
+
+/* Linux 3.19 */
+# ifndef ALG_SET_AEAD_ASSOCLEN
+#  define ALG_SET_AEAD_ASSOCLEN           4
+# endif
+# ifndef ALG_SET_AEAD_AUTHSIZE
+#  define ALG_SET_AEAD_AUTHSIZE           5
+# endif
+/* Linux 4.8 */
+# ifndef ALG_SET_PUBKEY
+#  define ALG_SET_PUBKEY                  6
+# endif
+
+# ifndef ALG_OP_SIGN
+#  define ALG_OP_SIGN                     2
+# endif
+# ifndef ALG_OP_VERIFY
+#  define ALG_OP_VERIFY                   3
+# endif
 
 #endif /* HAVE_SOCKADDR_ALG */