From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Sun, 24 Nov 2013 08:31:44 +0000 (-0500)
Subject: Blacklist ARM gcc 4.8.0, 4.8.1, 4.8.2
X-Git-Tag: v0.8.2~17
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=26cb9d81e0dff472f3da338ab8b2de1cd77676a7;p=userspace-rcu.git

Blacklist ARM gcc 4.8.0, 4.8.1, 4.8.2

It produces clobbered frame accesses, which can lead to stack corruption
when racing with signal handlers nested on stack.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu/compiler.h b/urcu/compiler.h
index 19534f0..1e30903 100644
--- a/urcu/compiler.h
+++ b/urcu/compiler.h
@@ -108,4 +108,23 @@
 
 #define CAA_ARRAY_SIZE(x)	(sizeof(x) / sizeof((x)[0]))
 
+/*
+ * Don't allow compiling with buggy compiler.
+ */
+
+#ifdef __GNUC__
+# define URCU_GCC_VERSION	(__GNUC__ * 10000 \
+				+ __GNUC_MINOR__ * 100 \
+				+ __GNUC_PATCHLEVEL__)
+
+/*
+ * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
+ */
+# ifdef __ARMEL__
+#  if URCU_GCC_VERSION >= 40800 && URCU_GCC_VERSION <= 40802
+#   error Your gcc version produces clobbered frame accesses
+#  endif
+# endif
+#endif
+
 #endif /* _URCU_COMPILER_H */