Swift: dyld: Symbol not found: _$sSly7ElementQz5IndexQzcigTq

[maxvol]

On Mojave, Xcode 10.2, Toolchain 0.3 getting this result for a command-line macOS app -

dyld: Symbol not found: _$sSly7ElementQz5IndexQzcigTq
  Referenced from: /Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.3-a.xctoolchain/usr/lib/swift/macosx/libswiftPython.dylib
  Expected in: /usr/lib/swift/libswiftCore.dylib
 in /Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.3-a.xctoolchain/usr/lib/swift/macosx/libswiftPython.dylib

I configured the project as described here -
https://stackoverflow.com/questions/55782961/swift-for-tensorflow-dyld-symbol-not-found-ssly7elementqz5indexqzcigtq

[Roslund]

I have the same issue.

[dan-zheng]

Could someone please share a simple reproducer?

[Roslund]

I'm not sure how to reproduce. But From what I've figured out, It seems like the problem is that in Xcode 10.2, Xcode uses the version of the swift standard library that's installed on the system, which differs from swift for TensorFlow standard library.

It works fine in Xcode 10.1 and in the Terminal.

[lukegeorge85]

On Mojave, Xcode 10.2, Toolchain 0.3 getting this result for a command-line macOS app -

dyld: Symbol not found: _$sSly7ElementQz5IndexQzcigTq
  Referenced from: /Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.3-a.xctoolchain/usr/lib/swift/macosx/libswiftPython.dylib
  Expected in: /usr/lib/swift/libswiftCore.dylib
 in /Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.3-a.xctoolchain/usr/lib/swift/macosx/libswiftPython.dylib

I configured the project as described here -
https://stackoverflow.com/questions/55782961/swift-for-tensorflow-dyld-symbol-not-found-ssly7elementqz5indexqzcigtq

I'm the poster of the original question. Any update on this issue? Is there any additional info I can provide to assist?

[hfoffani]

Same here. Mojave 10.14.4, Xcode 10.2.1, Toolchain 0.3.1
Minimal steps to reproduce it:

1. install Toolchain as indicated following steps 1,2,3 and 4.
2. file new project - macos-application-command line tool
3. name the project - create.
4. change project to legacy building
5. modify main.swift to add some code:

    import TensorFlow
    let t : Tensor<Float> = [[1,2],[3,4]]

(code completion for Tensor type works so the framework is recognized)

1. builds OK
2. run fails:

dyld: Library not loaded: @rpath/libswiftPython.dylib
  Referenced from: /Users/hernan/Library/Developer/Xcode/DerivedData/swift-t6-abxqyqiwnjnmhzfhehvbfsxkaccz/Build/Products/Debug/swift-t6
  Reason: image not found
Program ended with exit code: 9

1. add runpath search paths:
   /Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.3.1.xctoolchain/usr/lib/swift/macosx
2. builds OK
3. now run fails with:

dyld: Symbol not found: _$sSly7ElementQz5IndexQzcigTq
  Referenced from: /Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.3.1.xctoolchain/usr/lib/swift/macosx/libswiftPython.dylib
  Expected in: /usr/lib/swift/libswiftCore.dylib
 in /Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.3.1.xctoolchain/usr/lib/swift/macosx/libswiftPython.dylib
Program ended with exit code: 9

I assume it's picking up the standard libswiftCore.dylib instead of the Toolchain's one.

[maxvol]

Reproducible with either a macOS playground or a macOS app, also from toolchain from 30 April and Xcode 10.2.1

[Ayush517]

I was having the same issue, so I downgraded my Xcode to 10.0 version. Everything is working absolutely fine in that.

[Yeatse]

Adding a Run Script in Build Phases temporarily fixes this issue:

install_name_tool -delete_rpath /usr/lib/swift $TARGET_BUILD_DIR/$PRODUCT_NAME || true

This script forces generated executable load the Swift version specified in Build Settings -> Runpath Search Paths instead of the one built in latest Xcode.

[hfoffani]

Thanks @Yeatse. Your workaround fixed the problem in the steps I mentioned before.

Adding a Run Script in Build Phases temporarily fixes this issue:

install_name_tool -delete_rpath /usr/lib/swift $TARGET_BUILD_DIR/$PRODUCT_NAME || true

[dhasl002]

Adding a Run Script in Build Phases temporarily fixes this issue:

install_name_tool -delete_rpath /usr/lib/swift $TARGET_BUILD_DIR/$PRODUCT_NAME || true

Unfortunately, this does not work for me on Xcode 10.2.1

This is the error I get

error: install_name_tool: can't open file: /Users/dhaslam/Library/Developer/Xcode/DerivedData/Swift4Tensorflow-djrxnkrfydcxuicsyntnenxqidsq/Build/Products/Debug/Swift4Tensorflow (No such file or directory)
Command /bin/sh emitted errors but did not return a nonzero exit code to indicate failure

This folder does not exist:
/Users/dhaslam/Library/Developer/Xcode/DerivedData/Swift4Tensorflow-djrxnkrfydcxuicsyntnenxqidsq/Build/

Any help would be great. I would like to avoid changing my Xcode version. Thanks!

[ProfFan]

@dan-zheng Can confirm that this is also happening with the Jupyter environment on macOS as well. I am on XCode 11.2.

/usr/lib/swift slip in somewhere, but not in the compiled libraries...

EDIT: Can work around by using DYLD_LIBRARY_PATH=${SWIFT_TOOLCHAIN_PATH}/usr/lib/swift/macosx, but then I got EXC_BAD_ACCESS for library calls...

[amit-k-gupta]

Hi @dan-zheng I tried to add the above run script as suggested by you, but unfortunately, it didn't work. I am using XCode 11.2.1(11B53). The build failed to compile and I got below errors

[rahulbhalley]

In Xcode, checkmark Signing & Capabilities > Hardened Runtime > Disable Library Validation under Target setting of your project. It resolved this problem for me & I hope it helps others too! Also I did not have to use run script.

Solution was suggested by Daisuke in S4TF mailing list.

[rahulbhalley]

If someone is unable to find Hardened Runtime just simply add it by clicking + Capability & selecting it from the list.

[rahulbhalley]

@dan-zheng this seems to be a problem with code signing that prevents the S4TF program from running in Xcode. I feel that the solution should be documented in Installation readme to make it easy for Xcode users to get started with S4TF & not stay restricted to only REPL.

Edit: I've added a new PR regarding this.

[amit-k-gupta]

You guys can please answer the question here. As stackOverflow is accessed
by almost every developer

https://stackoverflow.com/questions/59340366/cannot-import-tensorflow-in-swift-playground

Amit Kumar Gupta
GMail [e-mail] | Twitter https://twitter.com/Amit__G |
LinkedIn https://www.linkedin.com/in/amitguptalnct/
Skype: amitgupta.lnct
Ph. No:9164752648

On Mon, Dec 30, 2019 at 6:51 AM Rahul Bhalley [e-mail]
wrote:

@dan-zheng https://github.com/dan-zheng this seems to be a problem with
code signing that prevents the S4TF program from running in Xcode. I feel
that the solution should be documented in Installation readme to make it
easy for Xcode users to get started with S4TF & not stay restricted to only
REPL.

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[dan-zheng]

I think the discussion is no longer related to the original issue dyld: Symbol not found: _$sSly7ElementQz5IndexQzcigTq, so I'll close this issue now.

If anyone encounters new issues, please create a new issue!