From fdafe11a25ad3e7ca8893c8630f86973431217b9 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Mon, 11 Mar 2013 13:23:10 -0400
Subject: Give an #error when we want threads and OpenSSL has disabled threads

Fixes ticket 6673.
---
 src/common/crypto.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/common')

diff --git a/src/common/crypto.c b/src/common/crypto.c
index 22d57c7c8a..3d8b1ba4ff 100644
--- a/src/common/crypto.c
+++ b/src/common/crypto.c
@@ -3000,6 +3000,12 @@ memwipe(void *mem, uint8_t byte, size_t sz)
 }
 
 #ifdef TOR_IS_MULTITHREADED
+
+#ifndef OPENSSL_THREADS
+#error OpenSSL has been built without thread support. Tor requires an \
+ OpenSSL library with thread support enabled.
+#endif
+
 /** Helper: OpenSSL uses this callback to manipulate mutexes. */
 static void
 openssl_locking_cb_(int mode, int n, const char *file, int line)
-- 
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