Can't compile with library about protobuf-emscripten HOT 6 CLOSED

First of all, like it says in the readme, you should rename the .so so .bc and link that one. The .a is irrelevant in the whole process.

As for your issue: I've not come across it and so far the only supported 3x version in the repo is 3.1.0. The newer protobuf versions have a javascript target out of the box.

Did you properly specify the include directory with -I? A correct example for invoking emscripten would be: em++ -Iprotobuf-emscripten/3.1/src program.cpp libprotobuf.bc.

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I have renamed the .so to .bc, but the output is still the same. (Specified the include directory too).
Thanks for helping, sorry to have wasted your time.

from protobuf-emscripten.

The .so to .bc will only solve the linking issue which would occur if the the file had the .so ending. You are not getting to the linking step which is why there is no difference. A missing include already aborts everything way before linking happens.

I don't mind helping you get it working if you tell me your rough use-case and how you build the 3.5.1 protobuf with emscripten in the first place. Not sure if applying the 3.1 patches is enough. Posting the CFLAGS and LDFLAGS would help, too.

from protobuf-emscripten.

I'm actually trying to compile grpc to WebAssembly to get a C++-based grpc client working in the browser (it seems like a long shot...).

I managed to build protobuf 3.5.1 with emconfigure ./configure --with-protoc=protoc && emmake make, this produces the library files under src/.libs/.

I realize now that the issue I talked about is not in the linking, but in the preprocessing. Sorry for the trouble, I do not have a lot of experience with compiling C/C++. It seems to find the headers now, but then I still get an error, described here. Do you have any ideas on how to fix this?

from protobuf-emscripten.

You can't compile the standard protobuf with emscripten. The sole purpose of this repository is to provide a patched version of protobuf (right now 2.6 and 3.1) that compiles with emscripten. The original google version will not compile with emscripten.

As for GRPC: Sorry to tell you that won't work either. At least not without knowing a substantial amount of C++. From what I can tell at first glance, it uses low level networking (e.g. http/2 protocl implementation on top of unix sockets) and threading. None of those are supported in emscripten. You could write your own transport layer but the threading issue would require a huge amount of changes to the code.

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That's too bad - well now it makes sense why there are no proper implementations of gRPC for browsers. I think I'll have to stick with REST/JSON and use a reverse REST - GRPC proxy. Thanks for all the help!

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