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a4dd314c9e
When iterating on core library changes or changes in the AOT compiler
many seconds are wasted waiting on gen_kernel/compile_platform to
parse Dart code. This happens because we are running these tools
from sources on prebuilt Dart SDK.
This CL allows SDK developer to opt-in into AOT compiling these
tools by adding `precompile_tools=true` to their DART_GN_ARGS.
AOT compilation is performed using prebuilt SDK - so these
executables do not need to be recompiled if core libraries or
VM changes reducing iteration cycles.
pkg/vm/tool/precompiler2 is tweaked to detect when DART_GN_ARGS
contains `precompile_tools=true` and use precompiled
gen_kernel.exe instead of running it from source.
Using precompiled compile_platform takes vm_platform_strong.dill
build from 20 seconds to 3 seconds.
Using precompiled gen_kernel takes small benchmark build from
~10 seconds to 2 seconds.
This relands
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| .. | ||
| analysis_server | ||
| bazel | ||
| compiler | ||
| dart2native | ||
| dart2wasm | ||
| dartanalyzer | ||
| dartdev | ||
| ddc | ||
| dds | ||
| dtd | ||
| gen_kernel | ||
| kernel-service | ||
| aot_snapshot.gni | ||
| application_snapshot.gni | ||
| BUILD.gn | ||
| compile_platform.gni | ||
| create_timestamp.gni | ||
| OWNERS | ||