From e568299c2c2f438cbbee687aa57d0a6cdecf7e0b Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <stefano.pigozzi@gmail.com>
Date: Wed, 1 Jan 2014 20:42:13 +0100
Subject: build: make configure fail if both __atomic and __sync are not
 available

---
 compat/atomics.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'compat')

diff --git a/compat/atomics.h b/compat/atomics.h
index 368476a964..14f0f2720f 100644
--- a/compat/atomics.h
+++ b/compat/atomics.h
@@ -24,7 +24,9 @@
 #if HAVE_ATOMIC_BUILTINS
 # define mp_memory_barrier()           __atomic_thread_fence(__ATOMIC_SEQ_CST)
 # define mp_atomic_add_and_fetch(a, b) __atomic_add_fetch(a, b,__ATOMIC_SEQ_CST)
-#else
+#elif HAVE_SYNC_BUILTINS
 # define mp_memory_barrier()           __sync_synchronize()
 # define mp_atomic_add_and_fetch(a, b) __sync_add_and_fetch(a, b)
+#else
+# error "this should have been a configuration error, report a bug please"
 #endif
-- 
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