fix: enable wasip2 feature for wasm32-wasip2 target (#305)

- wasip2 will require +nightly until rust-lang/rust#130323 is resolved and/or std::os::wasip2 is available in stable.
- Support was added to rustix for version 0.38.39 bytecodealliance/rustix#1205

Signed-off-by: Colin Murphy <[email protected]>
Co-authored-by: Steven Allen <[email protected]>

.github/workflows/ci.yml

@@ -57,6 +57,18 @@ jobs:
           targets: wasm32-wasip1
       - name: Build
         run: cargo build --target wasm32-wasip1 --features nightly
+  wasip2:
+    name: WASI P2 Test Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          targets: wasm32-wasip2
+      - name: Build
+        run: cargo build --target wasm32-wasip2 --features nightly
   wasm:
     name: WASM Test Build
     runs-on: ubuntu-latest

Cargo.toml

@@ -23,7 +23,7 @@ fastrand = "2.1.1"
 once_cell = { version = "1.19.0", default-features = false, features = ["std"] }
 
 [target.'cfg(any(unix, target_os = "wasi"))'.dependencies]
-rustix = { version = "0.38.37", features = ["fs"] }
+rustix = { version = "0.38.39", features = ["fs"] }
 
 [target.'cfg(windows)'.dependencies.windows-sys]
 version = ">=0.52,<=0.59"

src/lib.rs

@@ -136,6 +136,12 @@
 #![cfg_attr(test, deny(warnings))]
 #![deny(rust_2018_idioms)]
 #![allow(clippy::redundant_field_names)]
+// wasip2 conditionally gates stdlib APIs.
+// https://github.com/rust-lang/rust/issues/130323
+#![cfg_attr(
+    all(feature = "nightly", target_os = "wasi", target_env = "p2"),
+    feature(wasip2)
+)]
 #![cfg_attr(all(feature = "nightly", target_os = "wasi"), feature(wasi_ext))]
 
 #[cfg(doctest)]