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

[Harry Mallon]

Hi Lucas,

With Swift there is a required standard dylib that must be included (and Xcode copies by default). So perhaps CMake should automatically add the rpath option to the Xcode command line?

Harry

From: Lucas Šoltić <lucas.soltic at orange.fr>
Date: Friday, 2 March 2018 at 23:20
To: Harry Mallon <Harry.Mallon at codex.online>
Cc: "cmake at cmake.org" <cmake at cmake.org>
Subject: Re: [CMake] Swift executables with MACOSX_BUNDLE fail to find libswiftCore.dylib

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<mailto: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

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