THRIFT-4151: disable pthread concurrency analysis code in standard builds
Client: C++
This closes #1229
diff --git a/lib/cpp/README.md b/lib/cpp/README.md
index 2bee2ec..05aef95 100755
--- a/lib/cpp/README.md
+++ b/lib/cpp/README.md
@@ -272,3 +272,10 @@
The PRNG seed is key to the application security. This method should be
overridden if it's not strong enough for you.
+
+# Breaking Changes
+
+## 0.11.0
+
+In the pthread mutex implementation, the contention profiling code was enabled
+by default in all builds. This changed to be disabled by default. (THRIFT-4151)