Subspec for C++ protobuf

gRPC-C++.podspec

@@ -24,7 +24,7 @@ Pod::Spec.new do |s|
   s.name     = 'gRPC-C++'
   # TODO (mxyan): use version that match gRPC version when pod is stabilized
   # version = '1.14.0-dev'
-  version = '0.0.2'
+  version = '0.0.3'
   s.version  = version
   s.summary  = 'gRPC C++ library'
   s.homepage = 'https://grpc.io'
@@ -664,6 +664,17 @@ Pod::Spec.new do |s|
                               'src/core/ext/transport/inproc/inproc_transport.h'
   end
 
+  s.subspec 'Protobuf' do |ss|
+    ss.header_mappings_dir = 'include/grpcpp'
+    ss.dependency "#{s.name}/Interface", version
+
+    ss.source_files = 'include/grpcpp/impl/codegen/proto_buffer_reader.h',
+                      'include/grpcpp/impl/codegen/proto_buffer_writer.h',
+                      'include/grpcpp/impl/codegen/proto_utils.h',
+                      'include/grpcpp/impl/codegen/config_protobuf.h',
+                      'include/grpcpp/impl/codegen/config_protobuf.h'
+  end
+
   s.prepare_command = <<-END_OF_COMMAND
     find src/cpp/ -type f ! -path '*.grpc_back' -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "(pb(_.*)?\\.h)";#include <nanopb/\\1>;g'
     find src/cpp/ -type f -path '*.grpc_back' -print0 | xargs -0 rm

templates/gRPC-C++.podspec.template

@@ -49,6 +49,7 @@
     out = grpc_lib_files(filegroups, ("grpc++_codegen_proto", "grpc++_config_proto"), ("headers", "src", "public_headers"))
     excl_files = grpc_lib_files(filegroups, ("grpc++_codegen_base",), ("headers", "src", "public_headers"))
     out = [file for file in out if file not in excl_files]
+    out = filter_grpcpp(out)
     return out
 
   def grpcpp_private_files(libs, filegroups):
@@ -131,7 +132,7 @@
     s.name     = 'gRPC-C++'
     # TODO (mxyan): use version that match gRPC version when pod is stabilized
     # version = '${settings.version}'
-    version = '0.0.2'
+    version = '0.0.3'
     s.version  = version
     s.summary  = 'gRPC C++ library'
     s.homepage = 'https://grpc.io'
@@ -195,6 +196,13 @@
       ss.private_header_files = ${ruby_multiline_list(grpcpp_private_headers(libs, filegroups), 30)}
     end
 
+    s.subspec 'Protobuf' do |ss|
+      ss.header_mappings_dir = 'include/grpcpp'
+      ss.dependency "#{s.name}/Interface", version
+
+      ss.source_files = ${ruby_multiline_list(grpcpp_proto_files(filegroups), 22)}
+    end
+
     s.prepare_command = <<-END_OF_COMMAND
       find src/cpp/ -type f ! -path '*.grpc_back' -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "(pb(_.*)?\\.h)";#include <nanopb/\\1>;g'
       find src/cpp/ -type f -path '*.grpc_back' -print0 | xargs -0 rm