From ddf5feba786cf0147c4db9720c96e9a5636573b0 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 1 Dec 2014 10:00:32 +0000
Subject: [PATCH] sna: Generate a backtrace on assertion failures

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/sna/xassert.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/sna/xassert.h b/src/sna/xassert.h
index 7252ae82..1bcfd080 100644
--- a/src/sna/xassert.h
+++ b/src/sna/xassert.h
@@ -33,9 +33,15 @@
 #ifndef NDEBUG
 #include <os.h>
 #include "compiler.h"
+
+#if XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(1,6,0,0,0)
+#define xorg_backtrace()
+#endif
+
 #undef assert
-#define assert(E) do { \
-	if (unlikely(!(E))) FatalError("%s:%d assertion '%s' failed\n", __func__, __LINE__, #E); \
+#define assert(E) do if (unlikely(!(E))) { \
+	xorg_backtrace(); \
+	FatalError("%s:%d assertion '%s' failed\n", __func__, __LINE__, #E); \
 } while (0)
 #endif