Some additional fixes to make the C++ codegen not depend on protobuf.

src/compiler/cpp_generator.cc

@@ -86,7 +86,7 @@ void PrintIncludes(Printer *printer, const std::vector<grpc::string>& headers, c
   }
 }
 
-grpc::string GetHeaderPrologue(File *file, const Parameters &params) {
+grpc::string GetHeaderPrologue(File *file, const Parameters & /*params*/) {
   grpc::string output;
   {
     // Scope the output stream so it closes and finalizes output to the string.
@@ -96,6 +96,7 @@ grpc::string GetHeaderPrologue(File *file, const Parameters &params) {
     vars["filename"] = file->filename();
     vars["filename_identifier"] = FilenameIdentifier(file->filename());
     vars["filename_base"] = file->filename_without_ext();
+    vars["message_header_ext"] = file->message_header_ext();
 
     printer->Print(vars, "// Generated by the gRPC protobuf plugin.\n");
     printer->Print(vars,
@@ -104,7 +105,7 @@ grpc::string GetHeaderPrologue(File *file, const Parameters &params) {
     printer->Print(vars, "#ifndef GRPC_$filename_identifier$__INCLUDED\n");
     printer->Print(vars, "#define GRPC_$filename_identifier$__INCLUDED\n");
     printer->Print(vars, "\n");
-    printer->Print(vars, "#include \"$filename_base$.pb.h\"\n");
+    printer->Print(vars, "#include \"$filename_base$$message_header_ext$\"\n");
     printer->Print(vars, "\n");
   }
   return output;
@@ -794,8 +795,7 @@ grpc::string GetHeaderServices(File *file,
   return output;
 }
 
-grpc::string GetHeaderEpilogue(File *file,
-                               const Parameters &params) {
+grpc::string GetHeaderEpilogue(File *file, const Parameters & /*params*/) {
   grpc::string output;
   {
     // Scope the output stream so it closes and finalizes output to the string.
@@ -821,8 +821,7 @@ grpc::string GetHeaderEpilogue(File *file,
   return output;
 }
 
-grpc::string GetSourcePrologue(File *file,
-                               const Parameters &params) {
+grpc::string GetSourcePrologue(File *file, const Parameters & /*params*/) {
   grpc::string output;
   {
     // Scope the output stream so it closes and finalizes output to the string.
@@ -831,13 +830,16 @@ grpc::string GetSourcePrologue(File *file,
 
     vars["filename"] = file->filename();
     vars["filename_base"] = file->filename_without_ext();
+    vars["message_header_ext"] = file->message_header_ext();
+    vars["service_header_ext"] = file->service_header_ext();
 
     printer->Print(vars, "// Generated by the gRPC protobuf plugin.\n");
     printer->Print(vars,
                   "// If you make any local change, they will be lost.\n");
     printer->Print(vars, "// source: $filename$\n\n");
-    printer->Print(vars, "#include \"$filename_base$.pb.h\"\n");
-    printer->Print(vars, "#include \"$filename_base$.grpc.pb.h\"\n");
+    printer->Print(vars, "#include \"$filename_base$$message_header_ext$\"\n");
+    printer->Print(vars, "#include \"$filename_base$$service_header_ext$\"\n");
+    printer->Print(vars, file->additional_headers().c_str());
     printer->Print(vars, "\n");
   }
   return output;
@@ -1180,8 +1182,7 @@ grpc::string GetSourceServices(File *file,
   return output;
 }
 
-grpc::string GetSourceEpilogue(File *file,
-                               const Parameters &params) {
+grpc::string GetSourceEpilogue(File *file, const Parameters & /*params*/) {
   grpc::string temp;
 
   if (!file->package().empty()) {

src/compiler/cpp_generator.h

@@ -106,8 +106,11 @@ struct File {
 
   virtual grpc::string filename() const = 0;
   virtual grpc::string filename_without_ext() const = 0;
+  virtual grpc::string message_header_ext() const = 0;
+  virtual grpc::string service_header_ext() const = 0;
   virtual grpc::string package() const = 0;
   virtual std::vector<grpc::string> package_parts() const = 0;
+  virtual grpc::string additional_headers() const = 0;
 
   virtual int service_count() const = 0;
   virtual std::unique_ptr<const Service> service(int i) const = 0;

src/compiler/cpp_plugin.cc

@@ -120,11 +120,16 @@ class ProtoBufFile : public grpc_cpp_generator::File {
     return grpc_generator::StripProto(filename());
   }
 
+  grpc::string message_header_ext() const { return ".pb.h"; }
+  grpc::string service_header_ext() const { return ".grpc.pb.h"; }
+
   grpc::string package() const { return file_->package(); }
   std::vector<grpc::string> package_parts() const {
     return grpc_generator::tokenize(package(), ".");
   }
 
+  grpc::string additional_headers() const { return ""; }
+
   int service_count() const { return file_->service_count(); };
   std::unique_ptr<const grpc_cpp_generator::Service> service(int i) const {
     return std::unique_ptr<const grpc_cpp_generator::Service> (