improve caching

Author: xdustinface

.github/scripts/ci_config.py

@@ -160,12 +160,7 @@ def run_group_tests(args):
 
         github_group_start(f"Testing {crate}")
 
-        # On Windows, skip --all-features to avoid x11 feature
-        if args.os == "windows-latest":
-            cmd = ["cargo", "test", "-p", crate]
-        else:
-            cmd = ["cargo", "test", "-p", crate, "--all-features"]
-
+        cmd = ["cargo", "test", "-p", crate, "--all-features"]
         result = subprocess.run(cmd)
 
         github_group_end()

.github/workflows/rust.yml

@@ -35,11 +35,15 @@ jobs:
 
   docs:
     name: Documentation
+    needs: build
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: "rust-cache-ubuntu-latest"
+          save-if: false
       - name: Build documentation
         env:
           RUSTDOCFLAGS: -D warnings
@@ -59,9 +63,32 @@ jobs:
       - name: Check all crates are assigned to test groups
         run: python .github/scripts/ci_config.py verify-groups
 
+  # Build job compiles all dependencies first, populating the cache for test jobs
+  build:
+    name: "build (${{ matrix.os }})"
+    needs: verify-execution
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, ubuntu-22.04-arm, macos-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: "rust-cache-${{ matrix.os }}"
+          cache-on-failure: true
+      - name: Build workspace (populate cache)
+        run: cargo build --workspace --all-targets --all-features
+        if: matrix.os != 'windows-latest'
+      - name: Build workspace (Windows, exclude dash-fuzz)
+        run: cargo build --workspace --all-targets --all-features --exclude dash-fuzz
+        if: matrix.os == 'windows-latest'
+
   test:
     name: "test: ${{ matrix.group }} (${{ matrix.os }})"
-    needs: verify-execution
+    needs: build
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -73,7 +100,8 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:
-          shared-key: "rust-cache-${{ matrix.os }}-${{ matrix.group }}"
+          shared-key: "rust-cache-${{ matrix.os }}"
+          save-if: false
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
@@ -85,11 +113,15 @@ jobs:
 
   no-std:
     name: No-std Checks
+    needs: build
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: "rust-cache-ubuntu-latest"
+          save-if: false
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"