flutter build macos succeeds even if native asset builds failed #137910
Description
A simple flutter create hello app that depends on a package with native assets seems to build just fine with flutter build macos even though the actual native build of the depedency failed.
Repro: Create flutter create hello make it depend on foo, make foo simply throw an exception in build.dart. flutter build macos will then
% flutter build macos --verbose
[ ] [ +1 ms] Running `... .../build.dart .../.dart_tool/native_assets_builder/a6d771ecb50a7ea677377d476b2a411d/config.yaml`. [+1409 ms] [+1409 ms] Unhandled exception: [ ] [ ] foo [ ] [ ] #0 main (...)
[ ] [ ] #1 _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:295:33)
[ ] [ ] #2 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12) [ +25 ms] [ +25 ms] Building native assets for package:libexif failed. [ ] build.dart returned with exit code: 255. [ ] To reproduce run: [ ] /Users/kustermann/repositories/flutter/bin/dart --packages=/Users/kustermann/na/hello/.dart_tool/package_config.json /Users/kustermann/na/libexif/build.dart
...
[ ] /
[ +39 ms] ** BUILD SUCCEEDED **
[ +32 ms] Building macOS application... (completed in 27.2s)
[ +2 ms] "flutter macos" took 29,083ms.
[ +154 ms] ensureAnalyticsSent: 152ms
[ ] Running 0 shutdown hooks
[ ] Shutdown hooks complete
[ ] exiting with code 0
% echo $?
0