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Give RUSTC_BOOTSTRAP a list of crates #404
Description
From #402 (comment):
You can give the name of specific crates (separated with spaces I think). Rustc will then only allow unstable features for those crates. This could be used as a roadblock to prevent depending on unstable features outside of libcore, liballoc and libkernel. Driver code shouldn't ever rely on unstable features IMO. It is much easier to update only a few core crates than update many drivers as unstable features change.
This is blocked on allocator_api (at least) becoming stable (or a way to e.g. enable some unstable features from the command line but not allowing any other in source code), but as soon as we can do it, it can be a very good idea, specially when we are in mainline where others will be writing Rust drivers independently of us.
Activity
[-]Give `RUSTC_BOOTSTRAP` with a list of crates[/-][+]Give `RUSTC_BOOTSTRAP` a list of crates[/+]ojeda commentedon Jun 30, 2021
@bjorn3 I edited the post above to add another possibility: having a way to enable unstable features from the command-line but at the same time disallow any further features to be enabled in the actual source code. This would allow us to e.g. enable
allocator_apiglobally, but disallow kernel module writers any other feature.bjorn3 commentedon Jun 30, 2021
There is
-Zallow-featureswhich can restrict the list of allowed features. (names separated by spaces) This still requiresRUSTC_BOOTSTRAPand#![feature]though, but at least prevents drivers from using any features other thanallocator_api.ojeda commentedon Jun 30, 2021
That is actually perfect for us -- thanks a lot, I will add it.
ojeda commentedon Jul 2, 2021
-Zallow-featuresdone in #416.LoongArch: BPF: Add struct ops support for trampoline
selftests/bpf: Enable timed may_goto tests for arm64
Merge branch 'bpf-arm64-support-for-timed-may_goto'