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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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Currently target binaries contain support for all OS/arch combinations.
However, obviously a fuchsia target binary won't test windows.
For target binaries we need support only for a single target
(with the exception of 386/arm target in amd64/arm64 binaries).
So compile in only _the_ target into target binaries.
This reduces akaros/amd64 fuzzer binary from 33 to 7 MB
and execprog from 28 to 2 MB.
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