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Only use substrate-wasm-builder when std feature is enabled. (#12790)

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Co-authored-by: parity-processbot <>
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Nazar Mokrynskyi
2023-01-06 12:24:12 +02:00
committed by GitHub
parent 9fe5dd5f59
commit dccef86edb
13 changed files with 109 additions and 80 deletions
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substrate/utils/wasm-builder/README.md
+13 -12
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@@ -8,23 +8,24 @@ The Wasm builder is a tool that integrates the process of building the WASM bina
A project that should be compiled as a Wasm binary needs to:
1. Add a `build.rs` file.
2. Add `wasm-builder` as dependency into `build-dependencies`.
2. Add `wasm-builder` as dependency into `build-dependencies` (can be made optional and only enabled when `std` feature is used).
The `build.rs` file needs to contain the following code:
```rust
use substrate_wasm_builder::WasmBuilder;
fn main() {
WasmBuilder::new()
// Tell the builder to build the project (crate) this `build.rs` is part of.
.with_current_project()
// Make sure to export the `heap_base` global, this is required by Substrate
.export_heap_base()
// Build the Wasm file so that it imports the memory (need to be provided by at instantiation)
.import_memory()
// Build it.
.build()
#[cfg(feature = "std")]
{
substrate_wasm_builder::WasmBuilder::new()
// Tell the builder to build the project (crate) this `build.rs` is part of.
.with_current_project()
// Make sure to export the `heap_base` global, this is required by Substrate
.export_heap_base()
// Build the Wasm file so that it imports the memory (need to be provided by at instantiation)
.import_memory()
// Build it.
.build();
}
}
```