From ecdbc465bcac0750506a4218af3a705a5370ab81 Mon Sep 17 00:00:00 2001
From: Anton Lavrik <alavrik@piqi.org>
Date: Tue, 17 Apr 2018 23:38:18 -0700
Subject: [PATCH] Make .proto files generated by "piqi to-proto" as "proto2"

"piqi to-proto" is now generating 'syntax = "proto2"'; at the top of
converted .proto files. This prevents protoc from printing warnings like
this:

    No syntax specified for the proto file: ... Please use 'syntax =
    "proto2";' or 'syntax = "proto3";' to specify a syntax version.
    (Defaulted to proto2 syntax.)
---
 src/to_proto.ml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/to_proto.ml b/src/to_proto.ml
index 162e54fb..a4cbb55a 100644
--- a/src/to_proto.ml
+++ b/src/to_proto.ml
@@ -464,6 +464,7 @@ let gen_piqi (piqi:T.piqi) =
     List.map (fun x -> iol [ios x; eol; eol]) piqi.P.protobuf_custom
   in
   iol [
+    ios "syntax = \"proto2\";\n\n";
     package;
     iol proto_custom;
     piqi_import;