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Instead of generating Go files with descriptions
serialize them as gob and compress with flate.
This significantly reduces build time, go vet time,
and solves scalability problems with some static analysis tools.
Reference times (all after rm -rf ~/.cache/go-build) before:
TIME="%e %P %M" time go install ./syz-manager
48.29 577% 4824820
TIME="%e %P %M" time go test -c ./prog
56.28 380% 6973292
After:
TIME="%e %P %M" time go install ./syz-manager
22.81 865% 859788
TIME="%e %P %M" time go test -c ./prog
12.74 565% 267760
syz-manager size before/after: 194712597 -> 83418407
-57% even provided we now embed all descriptions
instead of just a single arch.
Deflate/decoding time for a single Linux arch is ~330ms.
Fixes #5542
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Commit empty files into generated packages,
so that the tree is buildable even w/o generated files
and Go tools continue to work.
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Checking in the generated descriptions files makes few things simpler,
but causes pain for pull requests: (1) PRs that touch descriptions
_always_ conflict, (2) PRs are large and harder to review,
(3) people sometimes forget to add auto-generated files.
The proposed way does not require us to hardcode lots of dependencies
in the Makefile (which is nice) and seem to work.
Let's see how it works.
The main contributor-visible consequence is that the auto-generated
files do not need to be checked-in now.
Credit for figuring the Makefile magic goes to @melver.
Fixes #1291
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all: add openbsd support
squash of the following commits:
* openbsd: add mandatory bits
* report: add OpenBSD support
* executor: skip building kvm on OpenBSD
* executor: add OpenBSD support
Linking against libutil is necessary due to usage of openpty(3).
* executor: fix typo in fail() message
* fixup! report: add OpenBSD support
* fixup! openbsd: add mandatory bits
* fixup! openbsd: add mandatory bits
* fixup! openbsd: add mandatory bits
* fixup! report: add OpenBSD support
* gometalinter: skip sys/openbsd
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