Share rustdoc's target dir across workspace #1291
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This significantly improves speed of checking workspaces with multiple crates and many dependencies, especially when they have expensive-to-build dependencies like
-syscrates built from source.Potential differences between dependencies and features of the workspace crates cause some dependency rebuilds, but that's still a fraction of what was otherwise rebuilt from scratch.
The shared
targetdir is placed alongside placeholder crates' dirs, but won't conflict with them, because placeholder dirs all have a-char.