tree cd203b855061300c808c56cf143b965cf594cb9f
parent 01b7bd968623539cb27dd58e06977400ecedd42e
author Eli Lipsitz <elipsitz@google.com> 1674001485 +0000
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1674001485 +0000

pw_build: Add --write-trace option to pw-wrap-ninja

This commit adds a new option to pw-wrap-ninja to write a trace file for
the build, in the Chromium trace_event format. This trace can be opened
with the Perfetto UI.

This trace only includes timing information from the build, not
dependency information from Ninja or additional compiler output. Thus,
it is simpler than a more comprehensive tool such as Fuchsia's
"ninjatrace". However, it's simple to use and still provides value.

Tested:
  Built Pigweed with pw-wrap-ninja and the --write-trace option.
  Confirmed the trace was viewable with the Perfetto UI.
Change-Id: I78e5717fb2257f74080def90fee253137defe3fd
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/126464
Commit-Queue: Eli Lipsitz <elipsitz@google.com>
Reviewed-by: Rob Mohr <mohrr@google.com>
Pigweed-Auto-Submit: Eli Lipsitz <elipsitz@google.com>