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> If you look at something like Bazel, all the build artifacts end up in ~/.cache (or similar).

That is a terrible design, as it makes parallel builds error prone.

Output directories are unique by the user and source project workspace directory. Output artifacts don't clobber, even though they are all in ~/.cache.

Other reasons to avoid the home directory:

1. It might be NFS mounted.

2. Space might be an issue and more difficult to plan for if build outputs are going there.

The location is not hard-coded and can be configured with the --output_base flag.

Bazel is the king of parallel builds though, at work we can spread out 100 actions wide across across a cluster of machines, and the only reason it's that small is we have no real need to go wider...

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