Problems with: Building the app.so (for running your app in Release/Profile mode)

[CAoTx]

I hope that this isn't an issue but rather a failure of me.

I'm trying to build the app.so to run the app in release mode on my Raspberry.
Anyhow, when I come to step 4 - Building the app.so, I get the following error:

Unable to open file build/kernel_snapshot.dill
../../../engine/src/third_party/dart/runtime/vm/dart_api_impl.cc: 2153: error: Dart_ExitScope expects there to be a current isolate. Did you forget to call Dart_CreateIsolateGroup or Dart_EnterIsolate?
Aborted (core dumped)
sbey@nunki:~/Projects/

The following commands were made:
3. Inside the app directory:

~/flutter/bin/cache/dart-sdk/bin/dart \
        ~/flutter/bin/cache/dart-sdk/bin/snapshots/frontend_server.dart.snapshot \
        --sdk-root ~/flutter/bin/cache/artifacts/engine/common/flutter_patched_sdk_product \
        --target=flutter \
        --aot \
        --tfa \
        -Ddart.vm.product=true \
        --packages .packages \
        --output-dill build\kernel_snapshot.dill \
        --verbose \
        --depfile build\kernel_snapshot.d \
        package:flutterReference/main.dart

After that, the both files buildkernel_snapshot.d & buildkernel_snapshot.dill were created in the root directory of my app rather than in the build folder. Is that right?

4. After downloading the engine_binary tree:

~/engine-binaries/gen_snapshot_linux_x64 \
        --causal_async_stacks \
        --deterministic \
        --snapshot_kind=app-aot-elf \
        --elf=build/app.so \
        --strip \
        --sim_use_hardfp \
        --no-use-integer-division \ 
        build/kernel_snapshot.dill

[CAoTx]

I moved the both files buildkernel_snapshot.d & buildkernel_snapshot.dill into the build directory and renamed the buildkernel_snapshot.dill to kernel_snapshot.dill.

Now the 4. runs through

Copied to the Raspberry.
On Rpi - inside the build folder:

When running
flutter-pi --release flutter_assets

The following error occurs:
[flutter-pi] Could not find "app.so" file inside "flutter_assets/", which is required for release and profile mode.

After copying app.so from build into build/flutter_assets everything works fine with:

flutter-pi --release flutter_assets

I will suggest the following improvements to help others avoid these problems and avoid the need for U to help them:

1. Clear out that gen_snapshot_linux_x64 has to be made executable:
   sudo chmod +x gen_snapshot_linux_x64
2. Copy the buildkernel_snapshot.d & buildkernel_snapshot.dill into the build folder
3. Rename the buildkernel_snapshot.dill into kernel_snapshot.dill
4. After Step 4, the app.so lays in the build folder rather than in the expected build/flutter_assets folder, copy it into flutter_assets

[ardera]

~/flutter/bin/cache/dart-sdk/bin/dart \
        ~/flutter/bin/cache/dart-sdk/bin/snapshots/frontend_server.dart.snapshot \
        --sdk-root ~/flutter/bin/cache/artifacts/engine/common/flutter_patched_sdk_product \
        --target=flutter \
        --aot \
        --tfa \
        -Ddart.vm.product=true \
        --packages .packages \
        --output-dill build\kernel_snapshot.dill \
        --verbose \
        --depfile build\kernel_snapshot.d \
        package:flutterReference/main.dart

You need to change all \ to / if you're running under linux. So --output-dill build\kernel_snapshot.dill should be changed into --output-dill build/kernel_snapshot.dill on linux.

After that, the both files buildkernel_snapshot.d & buildkernel_snapshot.dill were created in the root directory of my app rather than in the build folder. Is that right?

It's not right, but it's also not really a problem. build/kernel_snapshot.dill is just the default paths. The name of the file and it's path is pretty irrelevant. The only thing that matters is that you give the gen_snapshot_linux_x64 the correct path to the .dill file. (Which is where you went wrong, your .dill file was called buildkernel_snapshot.dill but the path you gave to gen_snapshot_linux_x64 was build/kernel_snapshot.dill)