Jonathan Brouwer
2263a8e19e
Allow merging all libcore/alloc doctests into a single binary This is only the changes needed to *allow* merging the tests. This doesn't actually turn doctest merging on in bootstrap. I think that might be a useful follow-up, since it makes them much faster to run, but it's not without downsides because it means we'll no longer be testing that doctests have all necessary `feature()` attributes. The motivation for this change is to run the tests with `-C instrument-coverage` and then generate a coverage report from the output. Currently, this is very expensive because it requires parsing DWARF for each doctest binary. Merging the binaries decreases the time taken from several hours to ~30 seconds. --- There are several parts to this change, most of which are independent and I'm happy to split out into other PRs. - Upgrade process spawning logging from debug->info so it's easier to see, including in a rustdoc built without debug symbols. - Core doctests now support being run with `-C panic=abort`. Ferrocene needs this downstream for complicated reasons; it's a one-line change so I figured it's not a big deal. - Downgrade errors about duplicate features from a hard error to a warning. The meaning is clear here, and doctest merging often creates duplicate features since it lifts them all to the crate root. This involves changes to the compiler but generally I expect this to be low-impact. - Enable this new warning, as well as several related feature lints, in rustdoc. By default rustdoc doesn't lint on anything except the lints it manually adds. - Rustdoc now treats `allow(incomplete_features)` as a crate-level attribute, just like `internal_features`. Without this, it's possible to get hard errors if rustdoc lifts features to the crate level but not `allow`s. - Core doctests now support being built with `--merge-doctests=yes`. In particular, I removed a few `$crate` usages and explicitly marked a few doctests as `standalone_crate`.
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