after I fixed #2376 (local patch, tested by sam, real fix coming soon) his next problem was

[external/envoy/source/server/server.cc:117] error initializing configuration '': Unable to parse JSON as proto (INVALID_ARGUMENT:(typed_dns_resolver_config.typed_config): invalid value Invalid type URL, unknown type: extensions.network.dns_resolver.apple.v3.AppleDnsResolverConfig for type Any):

Looking at envoy_build_config/extensions_build_config.bzl I see
"envoy.network.dns_resolver.apple": "//source/extensions/network/dns_resolver/apple:config",
in there and looking at platform selects it should work but did not.

Explicitly linking the resolver in the builder config did work (see below) so I'm not quite sure if Sam's not linking the expected target, or if something is screwy with our build files. Anyone else have an apple machine that can help?

+#include "source/extensions/network/dns_resolver/apple/apple_dns_impl.h"

+++ b/library/cc/BUILD
@@ -14,7 +14,8 @@ envoy_cc_library(
     ],
     repository = "
@Envoy
",
     deps = [
-        ":envoy_engine_cc_lib_no_stamp",
+      "
@Envoy
//source/extensions/network/dns_resolver/apple:config",
+      ":envoy_engine_cc_lib_no_stamp",
     ],
 )