Actual no_std support #1028
Actual no_std support #1028
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@@ Coverage Diff @@
## main #1028 +/- ##
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+ Coverage 90.80% 90.82% +0.02%
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Files 60 61 +1
Lines 31460 31458 -2
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+ Hits 28568 28573 +5
+ Misses 2892 2885 -7
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Completes the work started in #842 |
lightning/Cargo.toml
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| default = ["std"] | ||
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| [dependencies] | ||
| bitcoin = "0.27" | ||
| bitcoin = { version = "0.27", default-features = false, features = ["secp-recovery"] } | ||
| # TODO maybe bitcoin no-std should pull in this feature? |
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Yes, it absolutely should.
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I'll submit that to rust-bitcoin, and clean up here in a followup PR after it's released?
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Opened rust-bitcoin/rust-bitcoin#637 to address this
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| [dev-dependencies.bitcoin] | ||
| version = "0.27" | ||
| features = ["bitcoinconsensus"] | ||
| default-features = false |
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Given we rely on libbitcoinconsensus, do we need this?
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Are you saying that libbitcoinconsensus is dependent on std anyway, so there's no point in turning it off? shouldn't that library be made no_std?
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Hmm, yea, I guess it could be made no_std eventually, though I doubt anyone is gonna sit down and fight to get it there.
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So if I remove default-features = false then cargo test --no-default-features --features no_std fails. I think that's because the bitcoin crate has the std feature on, but this crate doesn't, so there's a mismatch in the bitcoin API signatures.
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lightning/src/lib.rs
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| pub use alloc::borrow::ToOwned; | ||
| pub use alloc::string::ToString; | ||
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| pub use io_extras::read_to_end; |
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Just personal preference, but I'm really not a fan of transparently including functions in prelude - it makes it somewhat unclear where they're coming from in code using it. Can we instead export copy from io_extras and then explicitly use copy and read_to_end from io_extras in files that use them?
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Agreed. Moving those and also sink.
lightning/src/lib.rs
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| #[cfg(any(test, feature = "_test_utils"))] extern crate hex; | ||
| #[cfg(any(test, feature = "fuzztarget", feature = "_test_utils"))] extern crate regex; | ||
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| #[cfg(feature = "no_std")] extern crate core2; |
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This line uses core2 under feature = no_std but core2 is also used below as not(feature = std). Should they be unified?
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I wonder if we should almost always use not(feature = std), as, if both are set, we really just want to use std::io because it probably means someone should/will set the core2/std flag.
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I addressed the comments. I also pushed a commit that renames the |
matches rust-bitcoin
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