From 3ad42b8f15ccc1811c46c1423869ee6546cac257 Mon Sep 17 00:00:00 2001
From: Emily <hello@emily.moe>
Date: Sun, 16 Mar 2025 17:08:08 +0000
Subject: [PATCH] github: use faster linkers in CI
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This shaves off something like 20 to 40 seconds for Linux. It’s
seemingly within the margin of error for Windows, so not sure if
we’ll want to keep it there.
---
 .cargo/config-ci.toml    | 9 ++++++++-
 .github/workflows/ci.yml | 4 ++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/.cargo/config-ci.toml b/.cargo/config-ci.toml
index e66ca5fb7..ff42c9675 100644
--- a/.cargo/config-ci.toml
+++ b/.cargo/config-ci.toml
@@ -2,8 +2,15 @@
 debug = "none"
 incremental = false
 
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-Clink-arg=-fuse-ld=mold"]
+
+[target.aarch64-unknown-linux-gnu]
+rustflags = ["-Clink-arg=-fuse-ld=mold"]
+
+[target.x86_64-pc-windows-msvc]
+linker = "rust-lld.exe"
 # NOTE: on Windows, build with the static CRT, so that produced .exe files don't
 # depend on vcruntime140.dll; otherwise the user requires visual studio if they
 # download a raw .exe
-[target.x86_64-pc-windows-msvc]
 rustflags = ["-Ctarget-feature=+crt-static"]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c90797110..cf78da010 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -80,6 +80,10 @@ jobs:
     - uses: taiki-e/install-action@0f58b6a196e0d71c72fd459ab8fd8b228f85f669
       with:
         tool: nextest,taplo-cli
+    - name: Install mold
+      uses: rui314/setup-mold@f80524ca6eeaa76759b57fb78ddce5d87a20c720
+      with:
+        make-default: false
     - name: Build
       run: >-
         cargo build