test: disable optimizations for CauseSegfault

Author: tie

src/node_process_methods.cc

@@ -70,8 +70,19 @@ static void Abort(const FunctionCallbackInfo<Value>& args) {
   ABORT();
 }
 
-// For internal testing only, not exposed to userland.
-static void CauseSegfault(const FunctionCallbackInfo<Value>& args) {
+// For internal testing only, not exposed to userland. If possible, disable
+// optimizations since we are technically relying on an undefined behavior that
+// modern compilers like to abuse.
+#ifdef __has_cpp_attribute
+#if __has_cpp_attribute(clang::optnone)
+[[clang::optnone]]
+#endif
+#if __has_cpp_attribute(gnu::optimize)
+[[gnu::optimize(0)]]
+#endif
+#endif
+static void
+CauseSegfault(const FunctionCallbackInfo<Value>& args) {
   // This should crash hard all platforms.
   volatile void** d = static_cast<volatile void**>(nullptr);
   *d = nullptr;