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

[Ankit Agarwal]

This seems to be the problem why REPL is not linking the C shared libs ->
https://bugs.swift.org/browse/SR-1624

On Thu, May 26, 2016 at 2:13 AM, Ankit Agarwal <ankit at ankit.im> wrote:

> I got this working by generating dylib for the C source
> https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/CreatingDynamicLibraries.html
>
> Steps:
>
> $ cd Fixtures/ClangModules/CLibrarySources/Sources
> $ swift build
> $ cp ../.build/debug/CLibrarySources.build/module.modulemap . #copy the
> module map
> $ clang -dynamiclib -std=gnu99 Foo.c -current_version 1.0
> -compatibility_version 1.0 -fvisibility=hidden -o libFoo.dylib
> $ swift -I include -L.  -lFoo
> 1> import CLibrarySources
> 2> foo()
> $R0: Int32 = 5
>
>
> On Thu, May 26, 2016 at 1:13 AM, Daniel Dunbar via swift-build-dev <
> swift-build-dev at swift.org> wrote:
>
>> 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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>>
>>
>>
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>>
>>
>
>
> --
> Ankit
>
>


-- 
Ankit
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