proto3 support on Windows #20

maciejlach opened this Issue Jan 16, 2017 · 4 comments


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2 participants


I tried to import simple proto3 file via RProtoBuf library, unfortunately this operation fails with error regarding unrecognized syntax identifier:

> install.packages("RProtoBuf")
> library(RProtoBuf)
> proto.dir <- "D:/dev/tmp/proto"
> readProtoFiles( dir = proto.dir )
D:/dev/tmp/proto/search.proto:1:10:Unrecognized syntax identifier "proto3".  This parser only recognizes "proto2".
Error in readProtoFiles(dir = proto.dir) :
  Could not load proto file 'D:/dev/tmp/proto/search.proto'

search.proto is defined as:

syntax = "proto3";

message SearchRequest {
  string query = 1;
  int32 page_number = 2;
  int32 result_per_page = 3;

My environment:

R version 3.3.2 (2016-10-31) -- "Sincere Pumpkin Patch"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64-bit)


C:\>protoc --version
libprotoc 3.1.0

Thanks in advance.

eddelbuettel commented Jan 16, 2017 edited

Yes, that's a bug. We still use the proto2 libraries.

I just tested a really simply fix pointing to the new libraries and built it on rhub.

For a short time window (two days?) you can access the resulting zip file for the package

Could you test that real quick for me?

eddelbuettel commented Jan 16, 2017 edited

And here is the package at win-builder; it too will persist for some time (IIRC: 72 hours).

It would be nice if you could confirm that it works. I can't (easily) fire up the Windows VM at work from home (as we have a holiday over here today).


@eddelbuettel I downloaded package from win-builder and I can confirm that load proto3 files on Windows are parsed correctly. Thanks!


Great, thanks for the feedback, and the bug report reminding us that we had forgotten Windows.

I'll push a 0.4.8 release.

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