From c3aedf480dd4e224165d9b8b5ed8735191eede6c Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Mon, 19 Sep 2016 22:10:21 +0900
Subject: [PATCH] Fix -Wexpansion-to-defined warning with clang-3.9

The error message was:

warning: macro expansion producing 'defined' has undefined behavior
[-Wexpansion-to-defined]

http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20160118/147239.html
---
 src/libssl_compat.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/libssl_compat.h b/src/libssl_compat.h
index fa8e6f65..0e03bfd7 100644
--- a/src/libssl_compat.h
+++ b/src/libssl_compat.h
@@ -37,7 +37,13 @@
 
 #include <openssl/opensslv.h>
 
+#if defined(LIBRESSL_VERSION_NUMBER)
+#define LIBRESSL_IN_USE 1
+#else // !defined(LIBRESSL_VERSION_NUMBER)
+#define LIBRESSL_IN_USE 0
+#endif // !defined(LIBRESSL_VERSION_NUMBER)
+
 #define OPENSSL_101_API                                                        \
-  (!defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER >= 0x1010000fL)
+  (!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x1010000fL)
 
 #endif // LIBSSL_COMPAT_H