Address comments on build systems

src/core/lib/iomgr/cfstream_handle.cc

@@ -74,8 +74,7 @@ void CFStreamHandle::ReadCallback(CFReadStreamRef stream,
             handle->read_event_.SetReady();
             break;
           default:
-            // Impossible
-            abort();
+            GPR_UNREACHABLE_CODE(return );
         }
         CFSTREAM_HANDLE_UNREF(handle, "read callback");
       });
@@ -105,8 +104,7 @@ void CFStreamHandle::WriteCallback(CFWriteStreamRef stream,
             handle->write_event_.SetReady();
             break;
           default:
-            // Impossible
-            abort();
+            GPR_UNREACHABLE_CODE(return );
         }
         CFSTREAM_HANDLE_UNREF(handle, "write callback");
       });

src/core/lib/iomgr/cfstream_handle.h

@@ -67,7 +67,7 @@ class CFStreamHandle final {
   gpr_refcount refcount_;
 };
 
-#ifndef NDEBUG
+#ifdef DEBUG
 #define CFSTREAM_HANDLE_REF(handle, reason) \
   (handle)->Ref(__FILE__, __LINE__, (reason))
 #define CFSTREAM_HANDLE_UNREF(handle, reason) \

src/core/lib/iomgr/error_apple.cc

@@ -18,7 +18,7 @@
 
 #include <grpc/support/port_platform.h>
 
-#ifdef GRPC_CFSTREAM
+#ifdef GPR_APPLE
 #include <CoreFoundation/CoreFoundation.h>
 
 #include <grpc/support/alloc.h>
@@ -49,4 +49,4 @@ grpc_error* grpc_error_create_from_cferror(const char* file, int line,
   gpr_free(error_msg);
   return return_error;
 }
-#endif /* GRPC_CFSTREAM */
+#endif /* GPR_APPLE */

src/core/lib/iomgr/polling_entity.cc

@@ -61,16 +61,11 @@ bool grpc_polling_entity_is_empty(const grpc_polling_entity* pollent) {
 void grpc_polling_entity_add_to_pollset_set(grpc_polling_entity* pollent,
                                             grpc_pollset_set* pss_dst) {
   if (pollent->tag == GRPC_POLLS_POLLSET) {
-#ifdef GRPC_CFSTREAM
     // CFStream does not use file destriptors. When CFStream is used, the fd
     // pollset is possible to be null.
     if (pollent->pollent.pollset != nullptr) {
       grpc_pollset_set_add_pollset(pss_dst, pollent->pollent.pollset);
     }
-#else
-    GPR_ASSERT(pollent->pollent.pollset != nullptr);
-    grpc_pollset_set_add_pollset(pss_dst, pollent->pollent.pollset);
-#endif
   } else if (pollent->tag == GRPC_POLLS_POLLSET_SET) {
     GPR_ASSERT(pollent->pollent.pollset_set != nullptr);
     grpc_pollset_set_add_pollset_set(pss_dst, pollent->pollent.pollset_set);

src/core/lib/iomgr/resolve_address.h

@@ -33,11 +33,7 @@
 #include <ws2tcpip.h>
 #endif
 
-#ifdef GRPC_POSIX_SOCKET
-#include <sys/socket.h>
-#endif
-
-#ifdef GRPC_CFSTREAM
+#if defined(GRPC_POSIX_SOCKET) || defined(GRPC_CFSTREAM)
 #include <sys/socket.h>
 #endif
 

src/core/lib/transport/transport.cc

@@ -184,12 +184,8 @@ void grpc_transport_set_pops(grpc_transport* transport, grpc_stream* stream,
              nullptr) {
     transport->vtable->set_pollset_set(transport, stream, pollset_set);
   } else {
-#ifdef GRPC_CFSTREAM
-  // No-op for empty pollset. CFStream does not use file destriptors. When
-  // CFStream is used, the fd pollset is possible to be null.
-#else
-    abort();
-#endif
+    // No-op for empty pollset. Empty pollset is possible when using
+    // non-fd-based event engines such as CFStream.
   }
 }