builder: support appending to non-existant archive #2767
Merged
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In Go 1.16, 'go tool pack r' reports an error if the archive doesn't
already exist (arguably a bug). The builder relied on this behavior
(arguably also a bug).
The builder will now create an empty archive before calling
'go tool pack r'. Note that 'go tool pack c' has some extra
functionality (copying export data) beyond creating the archive, so we
can't use that directly.
Fixes #2762