[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.
triSYCL · Dec 22, 2021 · a9bb97e · a9bb97e
1 parent 7176799
commit a9bb97e
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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;
 }