Trace events: add -time-trace to swiftc#2110
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-ftime-trace to swiftc-time-trace to swiftc
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Is there a chance other tools will benefit from a TimeTrace-like thing in the future and we would need to hoist it out of the driver?
| // Include the main module name in the trace file name to avoid collisions | ||
| // when multiple targets compile the same dependency module. | ||
| if enableTimeTrace { | ||
| commandLine.appendFlag("-time-trace") |
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I am not 100% sure how this option interacts with compiler caching, but additional flags/outputs will need to be taken into account. I think we should instead investigate having the dependency scanner specify these flags to module dependency command-line recipes.
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I removed it from supplementary outputs and removed suffixes. Do you still think dependency scanner investigation is needed if -time-trace-path is also cacheInvariant?
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Depends on swiftlang/swift#88251.
This behaves in the same way as Clang's
-ftime-trace:Generated JSON can be previewed with tools like https://ui.perfetto.dev.