removed spurious grpc_library.cc
diff --git a/src/cpp/codegen/codegen_init.cc b/src/cpp/codegen/codegen_init.cc
index 37abbad..f9f9ade 100644
--- a/src/cpp/codegen/codegen_init.cc
+++ b/src/cpp/codegen/codegen_init.cc
@@ -38,7 +38,12 @@
/// stay null in the absence of of grpc++ library. In this case, no gRPC
/// features such as the ability to perform calls will be available. Trying to
/// perform them would result in a segmentation fault when trying to deference
-/// the following nulled globals.
+/// the following nulled globals. These should be associated with actual
+/// as part of the instantiation of a \a grpc::GrpcLibraryInitializer variable.
+
+namespace grpc {
grpc::CoreCodegenInterface* grpc::g_core_codegen_interface = nullptr;
grpc::GrpcLibraryInterface* grpc::g_glip = nullptr;
+
+} // namespace grpc