[CMake] Swift executables with MACOSX_BUNDLE fail to find libswiftCore.dylib

[Lucas Šoltić]

You miss a runtime search path when linking your executable. And this is what you achieved with install_name_tool with an additional step.

To avoid this additional step, see https://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/RunpathDependentLibraries.html
or
https://stackoverflow.com/questions/42613881/adding-run-time-shared-library-search-path-to-executable-at-compile-time-clang

By the way this is not related to Swift at all.

Lucas

> Le 2 mars 2018 à 20:12, Harry Mallon <Harry.Mallon at codex.online> a écrit :
> 
> Hello all,
>  
> When making a pure Swift bundle Xcode automatically copies `libswiftCore.dylib` as follows.
>  
> ```
> ./Tests/SwiftOnly/Debug/SwiftOnly.app
> └── Contents
>     ├── Frameworks
>     │   └── libswiftCore.dylib
>     ├── Info.plist
>     ├── MacOS
>     │   └── SwiftOnly
>     ├── PkgInfo
>     └── Resources
>         └── libswiftRemoteMirror.dylib
> ```
> When I try to run the output I get a dynamic linking error. I can reproduce this by adding MACOSX_BUNDLE to `./Tests/SwiftOnly/CMakeLists.txt` (in the CMake source tree) in `add_executable` and trying to run the result.
>  
> ```
> % ./Tests/SwiftOnly/Debug/SwiftOnly.app/Contents/MacOS/SwiftOnly
> dyld: Library not loaded: @rpath/libswiftCore.dylib
>   Referenced from: .../Tests/SwiftOnly/Debug/SwiftOnly.app/Contents/MacOS/SwiftOnly
>   Reason: image not found
> zsh: abort      ./Tests/SwiftOnly/Debug/SwiftOnly.app/Contents/MacOS/SwiftOnly
> ```
>  
> It seems that the rpath should be set to `@loader_path/../Frameworks`. I am not a Swift maestro so not exactly sure on the details of how this works. After running `install_name_tool -add_rpath "@loader_path/../Frameworks" ./Tests/SwiftOnly/Debug/SwiftOnly.app/Contents/MacOS/SwiftOnly` it runs fine.
>  
> Does anyone have any idea what to do? Is it a missing CMake Swift feature? We are currently working around it by manually adding the rpath with a cmake step.
>  
> Harry
> Harry Mallon
> Senior Software Engineer
> 
> 
> 
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