Give linker config for Mold

Author: sourcefrog

docs/src/development/linux.md

@@ -24,7 +24,7 @@ If you are looking to develop Zed collaboration features using a local collabora
 
 On most Linux distributions, the default linker is GNU ld. Newer linkers, especially [Wild](https://github.com/davidlattimore/wild) and [Mold](https://github.com/rui314/mold) can significantly improve clean and incremental build time.
 
-At present Zed uses Mold in CI because it's more mature. For local development Wild is recommended because it's 5-20% faster.
+At present Zed uses Mold in CI because it's more mature. For local development Wild is recommended because it's 5-20% faster than Mold.
 
 These linkers can be installed with `script/install-mold` and `script/install-wild`.
 
@@ -34,6 +34,17 @@ To use Wild as your default, add these lines to your `~/.cargo/config.toml`:
 [target.x86_64-unknown-linux-gnu]
 linker = "clang"
 rustflags = ["-C", "link-arg=--ld-path=wild"]
+
+[target.aarch64-unknown-linux-gnu]
+linker = "clang"
+rustflags = ["-C", "link-arg=--ld-path=wild"]
+```
+
+To use Mold as your default:
+
+```toml
+[target.'cfg(target_os = "linux")']
+rustflags = ["-C", "link-arg=-fuse-ld=mold"]
 ```
 
 ## Building from source