Index: lib/scudo/standalone/tests/CMakeLists.txt
===================================================================
--- lib/scudo/standalone/tests/CMakeLists.txt
+++ lib/scudo/standalone/tests/CMakeLists.txt
@@ -12,7 +12,7 @@
   -I${COMPILER_RT_SOURCE_DIR}/lib/scudo/standalone
   -DGTEST_HAS_RTTI=0
   # Extra flags for the C++ tests
-  -fsized-deallocation
+  # TODO(kostya): find a way to make -fsized-deallocation work
   -Wno-mismatched-new-delete)
 
 set(SCUDO_TEST_ARCH ${SCUDO_STANDALONE_SUPPORTED_ARCH})
Index: lib/scudo/standalone/tests/wrappers_cpp_test.cc
===================================================================
--- lib/scudo/standalone/tests/wrappers_cpp_test.cc
+++ lib/scudo/standalone/tests/wrappers_cpp_test.cc
@@ -12,6 +12,9 @@
 #include <mutex>
 #include <thread>
 
+void operator delete(void *, size_t) noexcept;
+void operator delete[](void *, size_t) noexcept;
+
 // Note that every Cxx allocation function in the test binary will be fulfilled
 // by Scudo. See the comment in the C counterpart of this file.