mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Koute
2610450a18
Our executor currently only supports the WASM MVP feature set, however nowadays when compiling WASM the Rust compiler has more features enabled by default. We do set the `-C target-cpu=mvp` flag to make sure that *our* code gets compiled in a way that is compatible with our executor, however this doesn't affect Rust's standard library crates (`std`, `core` and `alloc`) which are by default precompiled and still can make use of these extra features. So in this PR we force the compiler to also compile the standard library crates for us to make sure that they also only use the MVP features. I've added the `WASM_BUILD_STD` environment variable which can be used to disable this behavior if set to `0`. Unfortunately this *will* slow down the compile times when building runtimes, but there isn't much that we can do about that. Fixes https://github.com/paritytech/polkadot-sdk/issues/1755 --------- Co-authored-by: Bastian Köcher <git@kchr.de>
54 lines
2.0 KiB
Rust
54 lines
2.0 KiB
Rust
// Copyright (C) Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Polkadot is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
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//! Defines primitive types for creating or validating a parachain.
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//!
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//! When compiled with standard library support, this crate exports a `wasm`
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//! module that can be used to validate parachain WASM.
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//!
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//! ## Parachain WASM
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//!
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//! Polkadot parachain WASM is in the form of a module which imports a memory
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//! instance and exports a function `validate_block`.
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//!
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//! `validate` accepts as input two `i32` values, representing a pointer/length pair
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//! respectively, that encodes [`ValidationParams`](primitives::ValidationParams).
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//!
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//! `validate` returns an `u64` which is a pointer to an `u8` array and its length.
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//! The data in the array is expected to be a SCALE encoded
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//! [`ValidationResult`](primitives::ValidationResult).
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//!
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//! ASCII-diagram demonstrating the return data format:
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//!
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//! ```ignore
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//! [pointer][length]
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//! 32bit 32bit
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//! ^~~ returned pointer & length
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//! ```
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//!
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//! The wasm-api (enabled only when `std` feature is not enabled and `wasm-api` feature is enabled)
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//! provides utilities for setting up a parachain WASM module in Rust.
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#![cfg_attr(not(feature = "std"), no_std)]
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pub mod primitives;
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#[cfg(all(not(feature = "std"), feature = "wasm-api"))]
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mod wasm_api;
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#[cfg(all(not(feature = "std"), feature = "wasm-api"))]
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pub use wasm_api::*;
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