[swift-build-dev] [SwiftPM] [swift-build] How to use C module in Swift REPL

[Daniel Dunbar]

Unfortunately, the error reporting isn't very good when LLVM tries to load a library (inside the JIT) and fails.

This is probably worth reporting as a bug. I'm not sure offhand and actually investigating this currently requires digging in to what is actually happening under the covers between the Swift importer and the LLVM JIT.

 - Daniel

> On May 25, 2016, at 12:38 PM, bhargav gurlanka via swift-build-dev <swift-build-dev at swift.org> wrote:
> 
> Hi,
> 
> I have a swift package with following layout:
> .
> ├── Package.swift
> ├── Sources
> │   ├── BarCModule
> │   │   ├── Bar.c
> │   │   └── include
> │   │       └── Bar.h
> │   └── MyApp
> │       └── main.swift
> └── Tests
> 
> After running swift build, I can see libBarCModule.so under .build/debug. How can I use this library in REPL?
> 
> I've tried:
> 
> $ swift -I.build/debug -L.build/debug -lBarCModule
> $ LD_LIBRARY_PATH=.build/debug swift -I.build/debug -L.build/debug -lBarCModule
> 
> But in both cases, I couldn't call a function defined inside my C Module.
> 
> 1> import BarCModule
> 2> say_hi
> error: Couldn't lookup symbols:
>   _say_hi
> 
> 
> 
> 
> Regards,
> Bhargav Gurlanka
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