Switch from ld (the default linker) to using lld for GNU Linux targets

Copies changes from vercel/turborepo#8166

Author: bgw

.cargo/config.toml

@@ -22,11 +22,18 @@ rustflags = ["-C", "target-feature=+crt-static"]
 [target.aarch64-pc-windows-msvc]
 linker = "rust-lld"
 
-[target.aarch64-apple-darwin]
+[target.'cfg(target_os = "macos")']
 linker = "rust-lld"
 
-[target.aarch64-unknown-linux-gnu]
-linker = "aarch64-linux-gnu-gcc"
+[target.'cfg(all(target_os = "linux", target_env = "gnu"))']
+rustflags = [
+  "--cfg",
+  "tokio_unstable",
+  "-Zshare-generics=y",
+  "-Zthreads=8",
+  "-Csymbol-mangling-version=v0",
+  "-Clink-arg=-fuse-ld=lld",
+]
 
 [target.aarch64-unknown-linux-musl]
 linker = "aarch64-linux-musl-gcc"

.github/actions/setup-rust/action.yml

@@ -16,6 +16,11 @@ runs:
         rustflags: ''
         cache: false
 
+    - name: 'Install LLD (LLVM Linker) for Linux'
+      if: runner.os == 'Linux'
+      shell: bash
+      run: sudo apt-get -y update && sudo apt-get install -y lld
+
     - name: 'Add cargo problem matchers'
       shell: bash
       run: echo "::add-matcher::${{ github.action_path }}/matchers.json"

contributing/core/developing.md

@@ -4,10 +4,21 @@
 - All pull requests should be opened against `canary`.
 - The changes on the `canary` branch are published to the `@canary` tag on npm regularly.
 
-To develop locally:
+## Dependencies
+
+- Install Rust and Cargo via [rustup](https://rustup.rs).
+- Install the [GitHub CLI](https://github.com/cli/cli#installation).
+- Enable pnpm:
+  ```
+  corepack enable pnpm
+  ```
+- (Linux) Install LLD, the LLVM linker:
+  ```
+  sudo apt install lld
+  ```
+
+## Local Development
 
-1. Install Rust and Cargo via [rustup](https://rustup.rs).
-1. Install the [GitHub CLI](https://github.com/cli/cli#installation).
 1. Clone the Next.js repository (download only recent commits for faster clone):
    ```
    gh repo clone vercel/next.js -- --filter=blob:none --branch canary --single-branch
@@ -16,10 +27,6 @@ To develop locally:
    ```
    git checkout -b MY_BRANCH_NAME origin/canary
    ```
-1. Enable pnpm:
-   ```
-   corepack enable pnpm
-   ```
 1. Install the dependencies with:
    ```
    pnpm install