From: Dmitry Pleshkov <bort@fb.com>
Date: Wed, 19 Oct 2016 22:57:39 +0000 (-0700)
Subject: Fix ExceptionCounter.oneThread test case
X-Git-Tag: v2016.10.24.00~8
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3770474ab39350c78dd1afea93c7f41fbab84726;p=folly.git

Fix ExceptionCounter.oneThread test case

Summary: Test fails because of loop unrolling: frames are not being grouped up

Reviewed By: ot

Differential Revision: D4034910

fbshipit-source-id: 159d3a4f116f90fdd0d51ee9de38634167ed0dc4
---

diff --git a/folly/experimental/exception_tracer/test/ExceptionCounterTest.cpp b/folly/experimental/exception_tracer/test/ExceptionCounterTest.cpp
index 24b413e9..706177b8 100644
--- a/folly/experimental/exception_tracer/test/ExceptionCounterTest.cpp
+++ b/folly/experimental/exception_tracer/test/ExceptionCounterTest.cpp
@@ -45,7 +45,9 @@ void throwAndCatch(F f) {
 
 TEST(ExceptionCounter, oneThread) {
   throwAndCatch(foo);
-  for (int i = 0; i < 10; ++i) {
+
+  // Use volatile to prevent loop unrolling (it screws up stack frame grouping).
+  for (volatile int i = 0; i < 10; ++i) {
     throwAndCatch(bar);
   }