[GitHub] [tvm] apeskov commented on issue #9268: [Bug] [ios_rpc] Error happens during dlopen execution. Unimplemented

[GitBox <gi...@apache.org>]

apeskov commented on issue #9268:
URL: https://github.com/apache/tvm/issues/9268#issuecomment-943299463


   Hi, @zhaiyi000 thank you
   This is a known issue related with latest update to Xcode 13. We are working on fix for main. I hope it will be available soon.
   
   Meanwhile I can suggest you to apply minimal workaround patch which will allow you to continue experiments with iOS.
   ```diff
   diff --git a/python/tvm/contrib/xcode.py b/python/tvm/contrib/xcode.py
   index c44a2fe4a..bb6eb8367 100644
   --- a/python/tvm/contrib/xcode.py
   +++ b/python/tvm/contrib/xcode.py
   @@ -71,6 +71,7 @@ def create_dylib(output, objects, arch, sdk="macosx"):
        cmd += ["-dynamiclib"]
        cmd += ["-arch", arch]
        cmd += ["-isysroot", sdk_path]
   +    cmd += ["-target", "arm64-apple-ios13.0"]  # any iOS version <15
        cmd += ["-o", output]
        if isinstance(objects, str):
            cmd += [objects]
   ```
   
   
   **Slightly more details about reason leading to that issue**
   
   Just FYI. TVM uses a custom DSO loader for iOS platform(because of JIT limitation of apple platform). This loader is a stripped version of original dyld loader with dropping a lot of functionality which is out of TVM needs. Particularly it supports only one format of storing export symbols inside a mach-o binary (via DYLD_INFO section). Before iOS 15 it was a default variant of binaries used for iOS. But recently default behaviour was changed in Xcode 13. Now linker uses CHAINED_FIXUPS format if you are targeting on iOS 15 and later. The patch above specifies target version to iOS 13 and forces linker to go old way with DYLD_INFO.


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