From a9bb97e8410b09446c8d6da3b7bb493f79a4aaea Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov@redhat.com>
Date: Wed, 22 Dec 2021 14:43:52 +0100
Subject: [msan] Break optimization in memccpy tests

After D116148 the memccpy gets optimized away and the expected
uninitialized memory access does not occur.

Make sure the call does not get optimized away.
---
 compiler-rt/lib/msan/tests/msan_test.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compiler-rt/lib/msan/tests/msan_test.cpp b/compiler-rt/lib/msan/tests/msan_test.cpp
index 085e904..00b736e 100644
--- a/compiler-rt/lib/msan/tests/msan_test.cpp
+++ b/compiler-rt/lib/msan/tests/msan_test.cpp
@@ -1560,6 +1560,7 @@ TEST(MemorySanitizer, memccpy_nomatch_positive) {
   char* y = new char[5];
   strcpy(x, "abc");
   EXPECT_UMR(memccpy(y, x, 'd', 5));
+  break_optimization(y);
   delete[] x;
   delete[] y;
 }
@@ -1570,6 +1571,7 @@ TEST(MemorySanitizer, memccpy_match_positive) {
   x[0] = 'a';
   x[2] = 'b';
   EXPECT_UMR(memccpy(y, x, 'b', 5));
+  break_optimization(y);
   delete[] x;
   delete[] y;
 }
-- 
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