Unable to load embedded and signed dylib on iPhone

Question

clementsiliceum OP

Created Dec ’23

Replies 2

Boosts 0

Participants 2

I'm trying to run an app that has a .dylib listed in the configuration of the application as "Embed & Sign"

I can confirm it is correctly signed by inspecting the package using codesign -dv --verbose=4 lib_paths.dylib and it gives me the following:

Executable=/Users/blablabla/Debug-iphoneos/TestApp.app/Frameworks/lib_paths.dylib
Identifier=lib_paths
Format=Mach-O thin (arm64)
CodeDirectory v=20400 size=784 flags=0x0(none) hashes=16+5 location=embedded
VersionPlatform=2
VersionMin=917504
VersionSDK=1049600
Hash type=sha256 size=32
CandidateCDHash sha256=7eaecbb8e00114767c9de0ac9054213620052212
CandidateCDHashFull sha256=7eaecbb8e00114767c9de0ac90542136200522121105dd217b38bd27e1fda4de
Hash choices=sha256
CMSDigest=7eaecbb8e00114767c9de0ac90542136200522121105dd217b38bd27e1fda4de
CMSDigestType=2
Executable Segment base=0
Executable Segment limit=32768
Executable Segment flags=0x0
Page size=4096
Launch Constraints:
	None
CDHash=7eaecbb8e00114767c9de0ac9054213620052212
Signature size=4795
Authority=Apple Development: myemail@address.com (XXXXXXXXX)
Authority=Apple Worldwide Developer Relations Certification Authority
Authority=Apple Root CA
Signed Time=13 Dec 2023 at 21:39:28
Info.plist=not bound
TeamIdentifier=XXXXXXXXXXX
Sealed Resources=none
Internal requirements count=1 size=180

But when trying to run the application, I am getting the following error:

Referenced from: '/private/var/containers/Bundle/Application/3142F1F2-547B-41B5-8EF4-239F4EAD2A4F/TestApp.app/FSVTestApp'
  Reason: tried: '/usr/lib/system/introspection/lib_paths.dylib' (no such file), 
'/usr/lib/swift/lib_paths.dylib' (no such file), 
'/private/var/containers/Bundle/Application/3142F1F2-547B-41B5-8EF4-239F4EAD2A4F/TestApp.app/Frameworks/lib_paths.dylib' (code signature invalid (errno=1) sliceOffset=0x00000000, codeBlobOffset=0x0000C5E0, codeBlobSize=0x00004B50 for '/private/var/containers/Bundle/Application/3142F1F2-547B-41B5-8EF4-239F4EAD2A4F/TestApp.app/Frameworks/lib_paths.dylib'),

Note that I enabled the "Automatically manage signing" option, and using a Personal Team.

This seems to work fine for the application itself (otherwise it wouldnt even try to load the dylib).

What is going on ?

Boost

Answer 1

DTS Engineer OP

Apple

Dec ’23

iOS does not support third-party standalone dynamic libraries. What you’re trying to do will work if you have a framework, so you need to place you dynamic library in a framework wrapper.

The basic rules for how to structure a framework are covered by Placing Content in a Bundle. However, that’s not sufficient to create one from scratch. I recommend that you create a new framework project and see how Xcode structures the final product.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 2

clementsiliceum OP

Dec ’23

iOS does not support third-party standalone dynamic libraries. What you’re trying to do will work if you have a framework, so you need to place you dynamic library in a framework wrapper.

I'm a bit surprised as the exact same project was building just fine 1year ago... And the dynamic library is embedded into the application bundle, shouldn't it be ok ? Is this something that changed recently ?

0