build: don't disable asserts

see MaterializeInc/materialize#32629

needed to make sure Cargo Release builds don't run into MaterializeInc/database-issues#9313

Author: def-

rdkafka-sys/build.rs

@@ -276,6 +276,13 @@ fn build_librdkafka() {
         env::set_var("CMAKE_LIBRARY_PATH", cmake_library_paths.join(";"));
     }
 
+    // When builing with `CMAKE_BUILD_TYPE=Release`, cmake automatically
+    // sets `-DNDEBUG` flags. This breaks librdkafka, which uses asserts for
+    // runtime error checking (confluentinc/librdkafka#5099). We unset
+    // `NDEBUG` by manually overwriting the cmake's `C_FLAGS` variables.
+    config.define("CMAKE_C_FLAGS_RELEASE", "-O3 -UNDEBUG");
+    config.define("CMAKE_CXX_FLAGS_RELEASE", "-O3 -UNDEBUG");
+
     println!("Configuring and compiling librdkafka");
     let dst = config.build();