feat(wasm-optimizer): build WASMs with -Ctarget-cpu=mvp (#4247)

utils/wasm-optimizer/Cargo.toml

@@ -16,6 +16,7 @@ gear-wasm-instrument.workspace = true
 pwasm-utils = { workspace = true, features = ["sign_ext"] }
 wasm-opt = { workspace = true, optional = true }
 regex.workspace = true
+rustc_version.workspace = true
 log.workspace = true
 wasmparser.workspace = true
 which.workspace = true

utils/wasm-optimizer/src/cargo_command.rs

@@ -32,21 +32,34 @@ pub struct CargoCommand {
     toolchain: Toolchain,
     check_recommended_toolchain: bool,
     force_recommended_toolchain: bool,
+    force_wasm_mvp: bool,
 }
 
 impl CargoCommand {
     /// Initialize new cargo command.
     pub fn new() -> CargoCommand {
+        let toolchain = Toolchain::try_from_rustup().expect("Failed to get toolchain from rustup");
+        let rustc_version = rustc_version::version().expect("Failed to get rustc version");
+        let force_wasm_mvp = toolchain != Toolchain::recommended_nightly()
+            && rustc_version.major == 1
+            && rustc_version.minor >= 82;
+
         CargoCommand {
             path: "rustup".to_string(),
             manifest_path: "Cargo.toml".into(),
             profile: "dev".to_string(),
-            rustc_flags: vec!["-C", "link-arg=--import-memory", "-C", "linker-plugin-lto"],
+            rustc_flags: if force_wasm_mvp {
+                // -C linker-plugin-lto causes conflict: https://github.com/rust-lang/rust/issues/130604
+                vec!["-C", "link-arg=--import-memory"]
+            } else {
+                vec!["-C", "link-arg=--import-memory", "-C", "linker-plugin-lto"]
+            },
             target_dir: "target".into(),
             features: vec![],
-            toolchain: Toolchain::try_from_rustup().expect("Failed to get toolchain from rustup"),
+            toolchain,
             check_recommended_toolchain: false,
             force_recommended_toolchain: false,
+            force_wasm_mvp,
         }
     }
 }
@@ -117,6 +130,10 @@ impl CargoCommand {
             .arg("--profile")
             .arg(&self.profile);
 
+        if self.force_wasm_mvp {
+            cargo.arg("-Zbuild-std=core,alloc,panic_abort");
+        }
+
         if !self.features.is_empty() {
             cargo.arg("--features");
             cargo.arg(self.features.join(","));
@@ -130,6 +147,13 @@ impl CargoCommand {
 
         self.remove_cargo_encoded_rustflags(&mut cargo);
 
+        if self.force_wasm_mvp {
+            cargo.env("CARGO_ENCODED_RUSTFLAGS", "-Ctarget-cpu=mvp");
+            if !self.toolchain.is_nightly() {
+                cargo.env("RUSTC_BOOTSTRAP", "1");
+            }
+        }
+
         let status = cargo.status().context("unable to execute cargo command")?;
         ensure!(
             status.success(),

utils/wasm-optimizer/src/cargo_toolchain.rs

@@ -101,4 +101,9 @@ impl Toolchain {
         );
         Ok(())
     }
+
+    /// Returns bool representing nightly toolchain.
+    pub fn is_nightly(&self) -> bool {
+        self.0.starts_with("nightly")
+    }
 }