The bridge always wants to load a framework on iOS

[Berrysoft]

Describe the bug

I'm trying to upgrade a frbv1 project to frbv2. The upgrade is successful on Android, but not iOS. With frbv1, the native lib is built as staticlib with a project generated by cargo-xcode. However, after upgrading to frbv2, the dart side always wants to load native.framework/native. I looked through the examples in this repo, but they all use cargokit. Is there a smooth upgrade path to still use the static lib without framework, or a way to change the xcode project to generate a dummy framework?

Steps to reproduce

The instructions here is interesting. Does dart_minimal really run well on iOS?

Logs

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Invalid argument(s): Failed to load dynamic library 'native.framework/native': dlopen(native.framework/native, 0x0001): tried: '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRootnative.framework/native' (errno=2), '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/swift/native.framework/native' (errno=2), '/usr/lib/swift/native.framework/native' (errno=2, not in dyld cache), '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/swift/native.framework/native' (errno=2), '/usr/lib/swift/native.framework/native' (errno=2, not in dyld cache), '/Users/berrysoft/Library/Developer<…>

Expected behavior

No response

Generated binding code

No response

OS

No response

Version of flutter_rust_bridge_codegen

No response

Flutter info

No response

Version of clang++

No response

Additional context

No response

[welcome]

Hi! Thanks for opening your first issue here! 😄

[fzyzcjy]

Hi, one way is to customize how the library is loaded: https://cjycode.com/flutter_rust_bridge/guides/how-to/load-library

Another way is to use flutter_rust_bridge_codegen create/integrate to generate v2 scaffold in one command, and then move your code into that scaffold.

Does dart_minimal really run well on iOS?

Yes, this is guaranteed by running it on CI (all platforms are auto checked, as well as many other checks) ;)

[Berrysoft]

@fzyzcjy Thank you for your advice! However after I choose to load the library from the process, the bridge complains cannot find store_dart_post_cobject. I revert back the changes to use the dummy_method_to_enforce_bundling method, but the generated header by codegen doesn't include the declaration of drop_dart_object, get_dart_object, new_dart_opaque and store_dart_post_cobject. Did I missed some steps?

P.S. I now generate the header with full_dep: true

[Berrysoft]

Or, where should I change the link args to make the linker always link the static lib so that I don't need the dummy method to enforce bundling?

[fzyzcjy]

but the generated header by codegen doesn't include the declaration of drop_dart_object, get_dart_object, new_dart_opaque and store_dart_post_cobject.

Ok this seems to be a bug, because dummy_method_to_enforce_bundling is not used in the cargokit-based approach so I missed it - feel free to PR (looks like a good-first-issue)! I guess it is as simple as, editing

flutter_rust_bridge/frb_codegen/src/library/codegen/generator/wire/c/spec_generator/dummy_function.rs

Line 25 in cfd8862

func_names

and make it something like func_names + EXTRA_EXTERN_FUNC_NAMES.

Before fixing it, maybe firstly try to manually add that few functions, and see whether it works.

EDIT: Seems that it is already generated https://github.com/fzyzcjy/flutter_rust_bridge/blob/cfd88621f77de211a9c214508b2dfcca29efd4e7/frb_example/pure_dart/frb_generated.h#L16432

Btw, if your library does not customize the build process, then directly using flutter_rust_bridge_codegen create/integrate may one of be the easiest way.

[Berrysoft]

EDIT: Seems that it is already generated

The declaration is not generated:) I mean the signature void store_dart_post_cobject(DartPostCObjectFnType ptr); is not generated.

And by the way it seems that the other 3 methods are no longer needed.

[fzyzcjy]

Oh looks reasonable!

P.S. Its declaration can be copied from

flutter_rust_bridge/frb_dart/lib/src/ffigen_generated/intermediate/allo_isolate.h

Line 61 in cfd8862

void store_dart_post_cobject(DartPostCObjectFnType ptr);

via a global search of the keyword

[github-actions]

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