feat: use nightly rust with cranelift for fast dev builds

Author: dionysuzx

.cargo/config.toml

@@ -0,0 +1,5 @@
+[build]
+rustflags = ["-Z", "threads=8"]
+
+[unstable]
+codegen-backend = true

.github/workflows/ci-rust.yml

@@ -3,6 +3,7 @@ name: CI - Rust
 on:
   push:
     paths:
+      - .cargo/**
       - Cargo.toml
       - Cargo.lock
       - crates/cli/**
@@ -16,14 +17,19 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v6
 
+      - name: Install Rust nightly with Cranelift
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rustc-codegen-cranelift-preview
+
       - name: Cache Cargo dependencies
         uses: Swatinem/rust-cache@v2
 
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
 
       - name: Generate code coverage
-        run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
+        run: CARGO_PROFILE_DEV_CODEGEN_BACKEND=llvm cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
 
       - name: Upload coverage to Codecov
         if: github.actor != 'dependabot[bot]'
@@ -39,6 +45,11 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v6
 
+      - name: Install Rust nightly with Cranelift
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rustfmt, clippy, rustc-codegen-cranelift-preview
+
       - name: Cache Cargo dependencies
         uses: Swatinem/rust-cache@v2
 

Cargo.toml

@@ -20,6 +20,9 @@ publish = false
 [patch.crates-io]
 num-bigint-dig = { git = "https://github.com/dignifiedquire/num-bigint", rev = "1eb690d9" }
 
+[profile.dev]
+codegen-backend = "cranelift"
+
 # The profile that 'dist' will build with
 [profile.dist]
 inherits = "release"

flake.lock

@@ -27,7 +27,9 @@
       overlays = [
         rust-overlay.overlays.default
         (final: prev: {
-          rustToolchain = final.rust-bin.stable.latest.default;
+          rustToolchain = final.rust-bin.nightly.latest.default.override {
+            extensions = [ "rustc-codegen-cranelift-preview" ];
+          };
         })
       ];