00:07 <FromGitter> <ttdonovan> This idea may have been to ambitious for my skills - I was hoping to use gRPC Ruby as and example for a Crystal implementation. C bindings seem to go way over my head and not really sure how to proceed or where to get more insight. If anyone could point me to useful examples of working with C bindings or suggestions on where I should go next it would greatly be appreciated. (Might also be a lost cause and I should just delete

00:07 <FromGitter> ... this repo and let someone more qualified than me start it) https://github.com/ttdonovan/grpc-crystal

00:08 <FromGitter> <mverzilli> hey I'm not sure if I'll be able to help you but I can give it a try

00:09 <FromGitter> <mverzilli> what's blocking you?

00:13 <FromGitter> <ttdonovan> I really don't have much at this time, just the example of the a desired "helloworld". I was looking over the Ruby grpc gem and hoping to use that as start. I'm confused about the Ruby `GRPC::RpcServer` and the use of `Core::Server.new`. It's unclear to me how Ruby defines this with the C bindings and then looking it over not sure how to correctly do this in Crystal.

00:14 <FromGitter> <ttdonovan> I think I might just be in over my head.

00:15 <FromGitter> <ttdonovan> I need sign-off but if you have any pointers or suggestion on where to look it would be appreciated.

00:17 <FromGitter> <mverzilli> I guess you checked here? https://crystal-lang.org/docs/syntax_and_semantics/c_bindings/index.html

00:18 <FromGitter> <mverzilli> then there's also https://github.com/crystal-lang/crystal_lib

00:19 <FromGitter> <mverzilli> if the C lib isn't too crazy binding it to Crystal shouldn't be difficult at all, it usually is almost mechanic

00:19 <FromGitter> <ttdonovan> maybe i need to look closer at crystal_lib

00:20 <FromGitter> <mverzilli> this is manual example (without crystal_lib) of binding LAPACK: https://github.com/mverzilli/crystalla/blob/master/src/crystalla/lib_lapack.cr

00:21 <FromGitter> <ttdonovan> so in your example where is the source for the lapack C code?

00:24 <FromGitter> <ttdonovan> err nevermind i see in your docker file

00:26 <FromGitter> <mverzilli> yeah, well you just link to it

00:26 <FromGitter> <ttdonovan> so my example with gRPC I would need to compile the source for gRPC core library?

00:28 <FromGitter> <mverzilli> not necessarily, you can use your system's package manager (if grpc is available)

01:07 <FromGitter> <mverzilli> it seems the gRPC team isn't super excited about people using the C core lib: https://github.com/grpc/grpc/issues/6814

01:07 <FromGitter> <mverzilli> but the steps laid out there seem to be a good pointer

01:11 <FromGitter> <ttdonovan> thanks for the pointers... looking at crystal_lib now but trying to run the example/lib_git2.cr raises an error on my machine (banging head against wall)

01:12 <FromGitter> <ttdonovan> ```code paste, see link``` [https://gitter.im/crystal-lang/crystal?at=57b7ae926981f5f269018300]

01:12 <FromGitter> <Sija> @ttdonovan perhaps u miss `brew link llvm --force`?

01:15 <FromGitter> <ttdonovan> I have `llvm37` and it just did an `unlink` and `link` same issue...

01:16 <FromGitter> <Sija> IIRC llvm 3.7 is unsupported, try with 3.8

01:17 <FromGitter> <Sija> @ttdonovan: https://github.com/crystal-lang/crystal/wiki/All-required-libraries

01:18 <FromGitter> <ttdonovan> ok thanks look now

01:18 <FromGitter> <ttdonovan> *looking

01:47 <FromGitter> <ttdonovan> @mverzilli I'm a little bit closer - just updated the README.md with steps for compiling and install gRPC but ran into an issue with generating the Crystal lib bindings

01:47 <FromGitter> <ttdonovan> ```code paste, see link``` [https://gitter.im/crystal-lang/crystal?at=57b7b6c587f779f069109396]

01:48 <FromGitter> <ttdonovan> just not sure how to include the `grpc.h` file

01:49 <FromGitter> <ttdonovan> https://github.com/ttdonovan/grpc-crystal#development

01:50 <FromGitter> <Sija> @ttdonovan: like in here - https://github.com/crystal-lang/crystal_lib/blob/master/examples/lib_git2.cr#L2

01:50 <FromGitter> <ttdonovan> yeah i can get that example to work - but am uncertain about grpc

01:52 <FromGitter> <Sija> I'd try putting in there `vendor/grpc/include/grpc/grpc.h`

01:53 <FromGitter> <ttdonovan> is the `Include` path relative to the file that's tries to include the `*.h`

01:57 <FromGitter> <Sija> more to `-I` path passed to `C(PP)FLAGS` but damn, i'm not sure 'bout that

01:59 <FromGitter> <Sija> next thing I guess would be `PWD` which would be your lib's root directory

02:00 <FromGitter> <ttdonovan> OK - I'll try playing around with the paths - need to go afk for awhile. Thanks for the assist.

02:01 <FromGitter> <Sija> Good luck :)