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`std::sys` configurability #113410

Open mkroening opened 1 year ago

mkroening commented 1 year ago

In https://github.com/rust-lang/rust/pull/113358, I tried to add a check for poll returning ENOSYS to the runtime initialization path of Linux.

The use-case was adding a target for the Unikraft Unikernel Development Kit, which does not support poll, in its most basic configuration and instead stubs it, returning ENOSYS.

@workingjubilee proposed in https://github.com/rust-lang/rust/pull/113358#issuecomment-1622441912 that we might want to make sys easier to configure according to different target's capabilities (even from target-spec.json).

@rustbot label: +A-technical-debt

mkroening commented 1 year ago

I just opened https://github.com/rust-lang/rust/pull/113411, where I added a Unikraft-specific cfg.