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x/build: automate testing "toolstash -cmp" with trybots #10418
For cleanup CLs like https://go-review.googlesource.com/#/c/8762, it would be nice if the trybots could take care of building a toolchain at HEAD, toolstash saving it, rebuilding at HEAD+CL, and then running an appropriate "toolstash -cmp" build.
Using toolstash/buildall, this only needs to be run once on a fast/cheap trybot type (e.g., linux/amd64) to avoid wasting more expensive trybot resources (e.g., OS X and/or ARM).
Obviously this would only be on an opt-in basis. Perhaps just a new dedicated trybot type that doesn't run by default, is configured with a different testing script than running all.bash, and is selected via whatever +trybot mechanism is implemented.
Maybe too niche a use case, but some rationale:
This exercises the linker as well as the compiler. Credit to Matthew Dempsky; see #10418. Change-Id: I793947c0c617a34e23df766bff5238ff3ac3c0af Reviewed-on: https://go-review.googlesource.com/9530 Reviewed-by: Michael Hudson-Doyle <firstname.lastname@example.org> Run-TryBot: Brad Fitzpatrick <email@example.com> TryBot-Result: Gobot Gobot <firstname.lastname@example.org> Reviewed-by: Brad Fitzpatrick <email@example.com>
Probably the easiest way to implement this is to take advantage of the existing post-make.bash snapshots we already upload to GCS for all builds.
So after trybots pass (probably for each build config? or at least Windows + Linux?), pull down tarballs of the git parent's previous make.bash snapshot and the current one, and toolstash cmp that, or equivalent.