27c7c4e26a
In order to support standard (de)serialization of structs, the
`rust-bitcoin` ecosystem uses the standard `std::io::{Read,Write}`
traits. This works great for environments with `std`, however sadly
the `std::io` module has not yet been added to the `core` crate.
Thus, in `no-std`, the `rust-bitcoin` ecosystem has historically
used the `core2` crate to provide copies of the `std::io` module
without any major dependencies. Sadly, its one dependency,
`memchr`, recently broke our MSRV.
Worse, because we didn't want to take on any excess dependencies
for `std` builds, `rust-bitcoin` has had to have
mutually-exclusive `std` and `no-std` builds. This breaks general
assumptions about how features work in Rust, causing substantial
pain for applications far downstream of `rust-bitcoin` crates.
Here, we add a new `bitcoin_io` crate, making it an unconditional
dependency and using its `io` module in the in-repository crates
in place of `std::io` and `core2::io`. As it is not substantial
additional code, the `hashes` io implementations are no longer
feature-gated.
This doesn't actually accomplish anything on its own, only adding
the new crate which still depends on `core2`.
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|---|---|---|
| .. | ||
| scripts | ||
| src | ||
| Cargo.toml | ||
| README.md | ||
| memory.x | ||
README.md
Running
To run the embedded test, first prepare your environment:
sudo ./scripts/install-deps
rustup +nightly target add thumbv7m-none-eabi
Then:
source ./scripts/env.sh && cargo +nightly run --target thumbv7m-none-eabi
Output should be something like:
heap size 524288
secp buf size 66240
Seed WIF: L1HKVVLHXiUhecWnwFYF6L3shkf1E12HUmuZTESvBXUdx3yqVP1D
Address: bc1qpx9t9pzzl4qsydmhyt6ctrxxjd4ep549np9993
Note that this heap size is required because of the amount of stack used by libsecp256k1 when initializing a context.
Cleanup
After sourcing scripts/env.sh and before building again using another target
you'll want to unset RUSTFLAGS otherwise you'll get linker errors.
unset RUSTFLAGS