I am attempting to use the same .proto file (protobuf) for a C# and a C++ project. My problem is that the C# file requires an import and some options set (protobuf-csharp-port) while the C++ file doesn't.
Is there any way I can tell protoc to ignore imports/options under certain circumstances?
Currently my only way around this is to create two different .proto files, and update both when changes are made.
Could you just have your proto files without import then proto files for C# that have required imports and import your original files?
Ah, this chestnut :(
Yes, it's a pain. No, I don't have a really nice way round it at the moment. I'd like a way of saying, "This imported file is only for extension options, and those extensions can be assumed to be available: include the values in the descriptor set, but don't try to resolve the extensions." Unfortunately there's no way of doing that.
What you can do is just include the C# options when you build the C++ version, and you'll end up with a C++ representation of your C# options. It's not pretty, but it won't actually do any harm. I've not actually done this in C++, but I've ended up generating the Java files for the C# options for exactly this reason before now.
If you have any other suggestions for how I could change the C# port to improve this, I'd be interested in hearing them...