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752906498a
This updates the Android build to declare the kernel compile depfile as an output and its contents as inputs when running with --preview-dart-2 (the default mode). The 'flutter build aot' command behaves differently depending on whether it's running in Dart 1 or Dart 2 mode: * Dart 1: the entrypoint Dart file (typically main.dart) is passed directly to gen_snapshot, which then emits snapshot.d, whose contents list the transitive closure of Dart dependencies (input files) for the snapshot. snapshot.d is a declared output, its contents (plus gen_snapshot itself) constitute the set of input files to the Gradle build action. * Dart 2: then entrypoint Dart file (typically main.dart) is first compiled with the Dart kernel frontend. This emits kernel_compile.d, whose contents list the transitive closure of Dart dependencies (input files) for the kernel 'dill' output file. This 'dill' file is then passed to gen_snapshot, which emits snapshot.d, whose contents are empty. As of this change, both snapshot.d and kernel_compile.d are declared outputs, and their contents (plus gen_snapshot and the frontend compiler themselves) constitute the set of input files to the Gradle build action. This fixes a bug wherein profile/release AOT outputs were not invalidated due to snapshot.d being empty, and kernel_compile.d being ignored. This was introduced during recent refactoring of the AOT build code, wherein the kernel compile and gen_snapshot actions were changed to emit independent depfiles (previously one stomped -- or failed to -- on the other's output). |
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