Frequent Unexpected Kernel SDK Version when building local engine #64849
Description
I might be holding it wrong, but I've been getting this error frequently when building Flutter with a local engine. We might want a better error message.
In Flutter engine
flutter fetch --all
flutter pull
gclient sync
./tools/gn --unoptimized --simulator
./tools/gn --unoptimized --simulator --ios
autoninja -C ../out/host_debug_sim_unopt
autoninja -C ../out/ios_debug_sim_unoptdo everything again in a few hours, then in a Flutter project
flutter run --local-engine=ios_debug_sim_unoptthen I tend to get
Unhandled exception:
Unexpected Kernel SDK Version 5831471fac (expected 8e50ccae25).
#0 BinaryBuilder._readAndVerifySdkHash (package:kernel/binary/ast_from_binary.dart:502:7)
#1 BinaryBuilder.readComponent.<anonymous closure> (package:kernel/binary/ast_from_binary.dart:534:7)
#2 Timeline.timeSync (dart:developer/timeline.dart:163:22)
#3 BinaryBuilder.readComponent (package:kernel/binary/ast_from_binary.dart:518:21)
#4 IncrementalCompiler.prepareSummary (package:front_end/src/fasta/incremental_compiler.dart:1446:12)
#5 IncrementalCompiler.ensurePlatformAndInitialize (package:front_end/src/fasta/incremental_compiler.dart:1000:23)
<asynchronous suspension>
#6 IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:215:17)
<asynchronous suspension>
#7 IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart)
#8 CompilerContext.runInContext.<anonymous closure>.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:123:46)
#9 new Future.sync (dart:async/future.dart:223:31)
#10 CompilerContext.runInContext.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:123:19)
#11 _rootRun (dart:async/zone.dart:1190:13)
#12 _CustomZone.run (dart:async/zone.dart:1093:19)
#13 _runZoned (dart:async/zone.dart:1630:10)
#14 runZoned (dart:async/zone.dart:1550:10)
#15 CompilerContext.runInContext (package:front_end/src/fasta/compiler_context.dart:122:12)
#16 IncrementalCompiler.computeDelta (package:front_end/src/fasta/incremental_compiler.dart:206:20)
#17 IncrementalCompiler.compile (package:vm/incremental_compiler.dart:69:46)
#18 FrontendCompiler.compile.<anonymous closure> (package:frontend_server/frontend_server.dart:524:59)
#19 new Future.<anonymous closure> (dart:async/future.dart:175:37)
#20 _rootRun (dart:async/zone.dart:1182:47)
#21 _CustomZone.run (dart:async/zone.dart:1093:19)
#22 _CustomZone.runGuarded (dart:async/zone.dart:997:7)
#23 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
#24 _rootRun (dart:async/zone.dart:1190:13)
#25 _CustomZone.run (dart:async/zone.dart:1093:19)
#26 _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:1021:23)
#27 Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:18:15)
#28 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:397:19)
#29 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:428:5)
#30 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
the Dart compiler exited unexpectedly.
the Dart compiler exited unexpectedly.
Haven't found a good way to get around it yet. Typically I just give up and try to rebuild everything for a different platform to keep testing.
Deleting the whole out/[ios/host]_debug_sim_unopt folder and rebuilding everything seems to fix it but is very time consuming.