fix CI (hopefully)

.github/actions/prepare-mlir-cache/action.yml

@@ -0,0 +1,54 @@
+name: Prepare MLIR Cache
+description: Restore or build the cached MLIR toolchain.
+
+inputs:
+  llvm-commit:
+    description: LLVM commit to build.
+    required: true
+  mold-linker-flags:
+    description: Linker flags used to force mold.
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Restore MLIR cache
+      id: restore-mlir-cache
+      uses: actions/cache/restore@v4
+      with:
+        path: onnx-mlir/llvm-project
+        key: mlir-${{ runner.os }}-${{ inputs.llvm-commit }}
+
+    - name: Clone LLVM
+      if: steps.restore-mlir-cache.outputs.cache-hit != 'true'
+      shell: bash
+      run: |
+        git clone --filter=blob:none --no-checkout https://github.com/llvm/llvm-project.git onnx-mlir/llvm-project
+        cd onnx-mlir/llvm-project
+        git fetch --depth 1 origin ${{ inputs.llvm-commit }}
+        git checkout FETCH_HEAD
+
+    - name: Build MLIR
+      if: steps.restore-mlir-cache.outputs.cache-hit != 'true'
+      shell: bash
+      run: |
+        cmake -S onnx-mlir/llvm-project/llvm -B onnx-mlir/llvm-project/build -G Ninja \
+          -DLLVM_ENABLE_PROJECTS="mlir;clang" \
+          -DLLVM_ENABLE_RUNTIMES="openmp" \
+          -DLLVM_TARGETS_TO_BUILD="host" \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DLLVM_ENABLE_ASSERTIONS=ON \
+          -DLLVM_ENABLE_RTTI=ON \
+          -DENABLE_LIBOMPTARGET=OFF \
+          -DLLVM_ENABLE_LIBEDIT=OFF \
+          -DCMAKE_EXE_LINKER_FLAGS="${{ inputs.mold-linker-flags }}" \
+          -DCMAKE_SHARED_LINKER_FLAGS="${{ inputs.mold-linker-flags }}" \
+          -DCMAKE_MODULE_LINKER_FLAGS="${{ inputs.mold-linker-flags }}"
+        cmake --build onnx-mlir/llvm-project/build
+
+    - name: Save MLIR cache
+      if: steps.restore-mlir-cache.outputs.cache-hit != 'true'
+      uses: actions/cache/save@v4
+      with:
+        path: onnx-mlir/llvm-project
+        key: mlir-${{ runner.os }}-${{ inputs.llvm-commit }}

.github/actions/prepare-protobuf-cache/action.yml

@@ -0,0 +1,45 @@
+name: Prepare Protobuf Cache
+description: Restore or build the cached protobuf installation.
+
+inputs:
+  protobuf-commit:
+    description: Protobuf tag or commit to build.
+    required: true
+  mold-linker-flags:
+    description: Linker flags used to force mold.
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Restore protobuf cache
+      id: restore-protobuf-cache
+      uses: actions/cache/restore@v4
+      with:
+        path: |
+          /usr/local/lib/libproto*
+          /usr/local/include/google/protobuf
+        key: protobuf-${{ runner.os }}-${{ inputs.protobuf-commit }}
+
+    - name: Install protobuf
+      if: steps.restore-protobuf-cache.outputs.cache-hit != 'true'
+      shell: bash
+      run: |
+        git clone --depth 1 --branch ${{ inputs.protobuf-commit }} https://github.com/protocolbuffers/protobuf
+        cmake -S protobuf -B protobuf/build -G Ninja \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DCMAKE_EXE_LINKER_FLAGS="${{ inputs.mold-linker-flags }}" \
+          -DCMAKE_SHARED_LINKER_FLAGS="${{ inputs.mold-linker-flags }}" \
+          -DCMAKE_MODULE_LINKER_FLAGS="${{ inputs.mold-linker-flags }}"
+        cmake --build protobuf/build
+        sudo cmake --install protobuf/build
+        rm -rf protobuf
+
+    - name: Save protobuf cache
+      if: steps.restore-protobuf-cache.outputs.cache-hit != 'true'
+      uses: actions/cache/save@v4
+      with:
+        path: |
+          /usr/local/lib/libproto*
+          /usr/local/include/google/protobuf
+        key: protobuf-${{ runner.os }}-${{ inputs.protobuf-commit }}

.github/actions/restore-raptor-build-cache/action.yml

@@ -0,0 +1,26 @@
+name: Restore Raptor Build Cache
+description: Restore the cached raptor build directory for incremental builds.
+
+inputs:
+  key:
+    description: Exact cache key to restore.
+    required: true
+  restore-keys:
+    description: Prefixes used to restore the most recent compatible cache.
+    required: false
+
+outputs:
+  cache-hit:
+    description: Whether the exact cache key was restored.
+    value: ${{ steps.restore-raptor-build-cache.outputs.cache-hit }}
+
+runs:
+  using: composite
+  steps:
+    - name: Restore raptor build cache
+      id: restore-raptor-build-cache
+      uses: actions/cache/restore@v4
+      with:
+        path: build
+        key: ${{ inputs.key }}
+        restore-keys: ${{ inputs.restore-keys }}

.github/actions/save-raptor-build-cache/action.yml

@@ -0,0 +1,16 @@
+name: Save Raptor Build Cache
+description: Save the raptor build directory after a successful incremental build.
+
+inputs:
+  key:
+    description: Cache key used to save the build directory.
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Save raptor build cache
+      uses: actions/cache/save@v4
+      with:
+        path: build
+        key: ${{ inputs.key }}

.github/workflows/build_mlir_cache.yml

@@ -1,50 +0,0 @@
-name: Build MLIR Cache
-
-on:
-  workflow_call:
-    inputs:
-      llvm-commit:
-        required: true
-        type: string
-
-jobs:
-  build-mlir:
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Cache MLIR build
-        id: cache-mlir
-        uses: actions/cache@v4
-        with:
-          path: onnx-mlir/llvm-project
-          key: mlir-${{ runner.os }}-${{ inputs.llvm-commit }}
-
-      - name: Install build dependencies
-        if: steps.cache-mlir.outputs.cache-hit != 'true'
-        run: |
-          sudo apt update
-          sudo apt install -y cmake ninja-build build-essential
-
-      - name: Clone LLVM
-        if: steps.cache-mlir.outputs.cache-hit != 'true'
-        run: |
-          git clone --filter=blob:none --no-checkout https://github.com/llvm/llvm-project.git onnx-mlir/llvm-project
-          cd onnx-mlir/llvm-project
-          git fetch --depth 1 origin ${{ inputs.llvm-commit }}
-          git checkout FETCH_HEAD
-
-      - name: Build MLIR
-        if: steps.cache-mlir.outputs.cache-hit != 'true'
-        run: |
-          mkdir -p onnx-mlir/llvm-project/build
-          cd onnx-mlir/llvm-project/build
-          cmake -G Ninja ../llvm \
-            -DLLVM_ENABLE_PROJECTS="mlir;clang" \
-            -DLLVM_ENABLE_RUNTIMES="openmp" \
-            -DLLVM_TARGETS_TO_BUILD="host" \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DLLVM_ENABLE_ASSERTIONS=ON \
-            -DLLVM_ENABLE_RTTI=ON \
-            -DENABLE_LIBOMPTARGET=OFF \
-            -DLLVM_ENABLE_LIBEDIT=OFF
-          cmake --build .

.github/workflows/validate_operations.yml

@@ -4,29 +4,14 @@ env:
   LLVM_COMMIT: 0c2701fe7fa002e1befc5f86c268a7964f96d286
   PROTOBUF_COMMIT: v34.0
   CMAKE_VERSION: 4.3.0
+  MOLD_LINKER_FLAGS: -fuse-ld=mold
 
 on:
   push:
   pull_request:
 
 jobs:
-  # Expose env vars as outputs so they can be passed to reusable workflows
-  config:
-    runs-on: ubuntu-latest
-    outputs:
-      llvm-commit: ${{ steps.set-vars.outputs.llvm-commit }}
-    steps:
-      - id: set-vars
-        run: echo "llvm-commit=$LLVM_COMMIT" >> "$GITHUB_OUTPUT"
-
-  build-mlir-cache:
-    needs: config
-    uses: ./.github/workflows/build_mlir_cache.yml
-    with:
-      llvm-commit: ${{ needs.config.outputs.llvm-commit }}
-
-  validate:
-    needs: build-mlir-cache
+  validate-operations:
     runs-on: ubuntu-latest
 
     steps:
@@ -39,7 +24,7 @@ jobs:
       - name: Install system dependencies
         run: |
           sudo apt update
-          sudo apt install -y ninja-build build-essential curl ca-certificates
+          sudo apt install -y cmake ninja-build build-essential mold curl ca-certificates
 
       - name: Install CMake
         run: |
@@ -58,27 +43,17 @@ jobs:
           cmake --version
           which cmake
 
-      - name: Cache protobuf build
-        id: cache-protobuf
-        uses: actions/cache@v4
+      - name: Prepare MLIR cache
+        uses: ./.github/actions/prepare-mlir-cache
         with:
-          path: |
-            /usr/local/lib/libproto*
-            /usr/local/include/google/protobuf
-          key: protobuf-${{ runner.os }}-${{ env.PROTOBUF_COMMIT }}
+          llvm-commit: ${{ env.LLVM_COMMIT }}
+          mold-linker-flags: ${{ env.MOLD_LINKER_FLAGS }}
 
-      - name: Install protobuf
-        if: steps.cache-protobuf.outputs.cache-hit != 'true'
-        run: |
-          git clone --depth 1 --branch ${{ env.PROTOBUF_COMMIT }} https://github.com/protocolbuffers/protobuf
-          cd protobuf
-          mkdir build
-          cd build
-          cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release
-          ninja
-          sudo ninja install
-          cd ../..
-          rm -rf protobuf
+      - name: Prepare protobuf cache
+        uses: ./.github/actions/prepare-protobuf-cache
+        with:
+          protobuf-commit: ${{ env.PROTOBUF_COMMIT }}
+          mold-linker-flags: ${{ env.MOLD_LINKER_FLAGS }}
 
       - name: Register installed libraries
         run: sudo ldconfig
@@ -94,23 +69,34 @@ jobs:
       - name: Install Python dependencies
         run: pip install numpy onnx colorama
 
-      - name: Restore MLIR cache
-        uses: actions/cache/restore@v4
+      - name: Restore raptor build cache
+        id: restore-raptor-build-cache
+        uses: ./.github/actions/restore-raptor-build-cache
         with:
-          path: onnx-mlir/llvm-project
-          key: mlir-${{ runner.os }}-${{ env.LLVM_COMMIT }}
-          fail-on-cache-miss: true
+          key: raptor-build-${{ runner.os }}-${{ github.ref_name }}-${{ env.LLVM_COMMIT }}-${{ env.PROTOBUF_COMMIT }}-${{ env.CMAKE_VERSION }}-${{ github.sha }}
+          restore-keys: |
+            raptor-build-${{ runner.os }}-${{ github.ref_name }}-${{ env.LLVM_COMMIT }}-${{ env.PROTOBUF_COMMIT }}-${{ env.CMAKE_VERSION }}-
+            raptor-build-${{ runner.os }}-${{ env.LLVM_COMMIT }}-${{ env.PROTOBUF_COMMIT }}-${{ env.CMAKE_VERSION }}-
 
       - name: Build Raptor
+        id: build-raptor
         run: |
           MLIR_DIR=$(pwd)/onnx-mlir/llvm-project/build/lib/cmake/mlir
-          mkdir -p build && cd build
-          cmake .. -G Ninja \
+          cmake -S . -B build -G Ninja \
             -DCMAKE_BUILD_TYPE=Debug \
             -DONNX_MLIR_ACCELERATORS=PIM \
             -DLLVM_ENABLE_ASSERTIONS=ON \
-            -DMLIR_DIR=${MLIR_DIR}
-          cmake --build .
+            -DMLIR_DIR=${MLIR_DIR} \
+            -DCMAKE_EXE_LINKER_FLAGS="${MOLD_LINKER_FLAGS}" \
+            -DCMAKE_SHARED_LINKER_FLAGS="${MOLD_LINKER_FLAGS}" \
+            -DCMAKE_MODULE_LINKER_FLAGS="${MOLD_LINKER_FLAGS}"
+          cmake --build build
+
+      - name: Save raptor build cache
+        if: steps.build-raptor.outcome == 'success' && steps.restore-raptor-build-cache.outputs.cache-hit != 'true'
+        uses: ./.github/actions/save-raptor-build-cache
+        with:
+          key: raptor-build-${{ runner.os }}-${{ github.ref_name }}-${{ env.LLVM_COMMIT }}-${{ env.PROTOBUF_COMMIT }}-${{ env.CMAKE_VERSION }}-${{ github.sha }}
 
       - name: Run validation
         run: |