`nightly`-only options in `~/.cargo/config.toml` break build of default setup

[virtualritz]

Describe the bug

flutter_rust_bridge_codegen create fl_test 
cd fl_test
flutter run

Gives me:

Connected devices:
Linux (desktop) • linux  • linux-x64      • Ubuntu 23.10 6.5.11-060511-generic
Chrome (web)    • chrome • web-javascript • Google Chrome 123.0.6312.105
[1]: Linux (linux)
[2]: Chrome (chrome)
Please choose one (or "q" to quit): 1
Launching lib/main.dart on Linux in debug mode...
SEVERE: error: failed to run `rustc` to learn about target-specific information
SEVERE:   error: the option `Z` is only accepted on the nightly compiler
SEVERE:   error: 1 nightly option were parsed
Building Linux application...                                           
Error: Build process failed

This is coming from my ~/.cargo/config.toml and the fact that the project seems to use stable by default. The former looks like this on my machine:

[target.x86_64-unknown-linux-gnu]
linker = "clang"
rustflags = ["-Z", "share-generics=y", "-C", "link-arg=--ld-path=/usr/bin/mold"]

[registries.crates-io]
protocol = "sparse"

[target.aarch64-linux-android]
linker = "aarch64-linux-android-clang"

Removing -Z share-generics resolve this for me but not really, as for the code I'm binding to Dart I will need a nighly rustc anyway, eventually.

I also ran rustup override set nightly but it seems the toolchain is defined elsewhere? I grepped for stable but didn't find anything suggestive of being a config option.

It would be great to add some hints to the README/quickstart on how to solve this pitfall.

I would assume that my cargo config is fairly standard for anyone using nightly on linux who cares about build times (who doesn't?). The share-generics option commonly gives me 10–15% build time reduction.

Steps to reproduce

See above. Add the resp. -Z option to your ~/.cargo/config.toml and try to flutter run a freshly generated project.

OS

Linux (Ubuntu 23.10)

Version of flutter_rust_bridge_codegen

2.0.0-dev.30

Flutter info

[✓] Flutter (Channel stable, 3.19.5, on Ubuntu 23.10 6.5.11-060511-generic, locale en_US.UTF-8)
    • Flutter version 3.19.5 on channel stable at /opt/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 300451adae (11 days ago), 2024-03-27 21:54:07 -0500
    • Engine revision e76c956498
    • Dart version 3.3.3
    • DevTools version 2.31.1

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /home/moritz/Android/Sdk/
    • Platform android-34, build-tools 34.0.0
    • ANDROID_HOME = /home/moritz/Android/Sdk/
    • ANDROID_SDK_ROOT = /home/moritz/Android/Sdk/
    • Java binary at: /usr/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.10+7-Ubuntu-123.10.1)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • Ubuntu clang version 16.0.6 (15)
    • cmake version 3.27.4
    • ninja version 1.11.1
    • pkg-config version 1.8.1

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions).

[✓] VS Code (version 1.87.2)
    • VS Code at /snap/code/current/usr/share/code
    • Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 23.10 6.5.11-060511-generic
    • Chrome (web)    • chrome • web-javascript • Google Chrome 123.0.6312.105

[✓] Network resources
    • All expected network resources are available.

Version of clang++

Ubuntu clang version 16.0.6 (15)

[welcome[bot]]

Hi! Thanks for opening your first issue here! :smile:

[fzyzcjy]

Hi, I guess this may be a Cargokit issue instead of flutter_rust_bridge code, thus it may be helpful to ask there.

By the way, running flutter run --verbose (i.e. the verbose flag) and paste it here may reveal the exact error more concretely a little bit.

EDIT: A quick search shows https://github.com/irondash/cargokit/blob/main/docs/architecture.md where you can have cargokit.yaml and configure nightly toolchain, which seems related.

[virtualritz]

EDIT: A quick search shows https://github.com/irondash/cargokit/blob/main/docs/architecture.md where you can have cargokit.yaml and configure nightly toolchain, which seems related.

Didn't see this in my email. This solved it! Thanks heaps! :grin:

Suggestion to close this issue and prevent others from running into it:

1. [ ] Generate a default cargokit.yaml in the rust subfolder when creating a new project with flutter_rust_bridge_codegen create.
   1. [ ] Add a comment to the top of that file that links to https://github.com/irondash/cargokit/blob/main/docs/architecture.md.
2. [ ] Mention this in the README & quickstart.

[fzyzcjy]

Good idea, and feel free to PR / I just modify the doc! Just a minor suggestion to 2nd point: Maybe mention in a new file in https://cjycode.com/flutter_rust_bridge/guides/miscellaneous

[github-actions[bot]]

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