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Troubleshooting

The generated store_dart_post_cobject() has the wrong signature / 'stdarg.h' file not found in Linux / stdbool.h / ...

Try to run code generator with working directory at /, or set the environment variable:

export CPATH="$(clang -v 2>&1 | grep "Selected GCC installation" | rev | cut -d' ' -f1 | rev)/include"

as described in ffigen #257, or add include path as is described in #108. This is a problem with Rust's builtin Command. See also: #472 & #494.

Issue with store_dart_post_cobject

If calling rust function gives the error below, please consider running cargo build again. This can happen when the generated rs file is not included when building is being done.

[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Invalid argument(s): Failed to lookup symbol 'store_dart_post_cobject': target/debug/libadder.so: undefined symbol: store_dart_post_cobject

Error running cargo ndk: ld: error: unable to find library -lgcc

Downgrade Android NDK to version 22. This is an ongoing issue with cargo-ndk, a library unrelated to flutter_rust_bridge but solely used to build the examples, when using Android NDK version 23. (See #149)

Fail to run flutter_rust_bridge_codegen on MacOS, "Please supply one or more path/to/llvm..."

If you are running macOS, you will need to specify a path to your llvm:

flutter_rust_bridge_codegen --rust-input path/to/your/api.rs --dart-output path/to/file/being/bridge_generated.dart --llvm-path /usr/local/homebrew/opt/llvm/

You can install llvm using brew install llvm and it will be installed at /usr/local/homebrew/opt/llvm/ by default.

Freezed file is sometimes not generated when it should be

If your .freezed.dart or .g.dart seems outdated, ensure you have run the build_runner.

Related: fzyzcjy/flutter_rust_bridge#330

Can't create typedef from non-function type.

Ensure min sdk version of Flutter pubspec.yaml is at least 2.13.0 to let ffigen happy.

fzyzcjy/flutter_rust_bridge#334

Generated code is so long

Indeed all generated code are necessary (if you find something that can be simplified, file an issue). Moreover, other code generation tools also generate long code - for example, when using Google protobuf, a very popular serialization library, I see >10k lines of Java code generated for a quite simple source proto file.

为什么需要 Dart 2.14.0

这个库并不需要 Dart SDK >=2.14.0, 但是最新的 ffigen 工具需要。所以才会在 pubspec.yaml 的 environment 中限制 sdk: ">=2.14.0 <3.0.0". 如果你需要摆脱这个限制，请考虑使用更老版本的 ffigen 工具。

其它问题？

不要犹豫 open an issue! 我通常会在几分钟或者是几小时内回复 (当然除了我睡觉时 :D).