Attempt #12346

Author: zpostfacto

.github/workflows/build.yml

@@ -42,7 +42,9 @@ jobs:
         os-version: [2022, 2025]
         crypto: [OpenSSL, BCrypt]
     env:
-      LOCAL_VCPKG_ROOT: ${{ github.workspace }}/vcpkg
+      VCPKG_ROOT: ${{ github.workspace }}/vcpkg
+      VCPKG_DEFAULT_BINARY_CACHE: ${{ github.workspace }}/vcpkg-bincache
+      VCPKG_BINARY_SOURCES: clear;files,${{ github.workspace }}/vcpkg-bincache,readwrite
     steps:
       - uses: actions/checkout@main
 
@@ -54,14 +56,29 @@ jobs:
       # install of vcpkg, and we don't want that
       - uses: ilammy/msvc-dev-cmd@v1
 
+      - name: Force workflow VCPKG_ROOT
+        run: |
+          "VCPKG_ROOT=${{ github.workspace }}/vcpkg" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+        shell: pwsh
+
       - name: Setup local vcpkg
         run: |
-          git clone https://github.com/microsoft/vcpkg.git "${{ env.LOCAL_VCPKG_ROOT }}"
-          cd /d "${{ env.LOCAL_VCPKG_ROOT }}"
+          git clone https://github.com/microsoft/vcpkg.git "${{ env.VCPKG_ROOT }}"
+          cd /d "${{ env.VCPKG_ROOT }}"
           git checkout c3867e714dd3a51c272826eea77267876517ed99
           call bootstrap-vcpkg.bat -disableMetrics
         shell: cmd
 
+      - name: Restore vcpkg caches
+        uses: actions/cache@v4
+        with:
+          path: |
+            ${{ env.VCPKG_ROOT }}/downloads
+            ${{ env.VCPKG_DEFAULT_BINARY_CACHE }}
+          key: vcpkg-${{ runner.os }}-${{ matrix.os-version }}-${{ matrix.crypto }}-c3867e714dd3a51c272826eea77267876517ed99-${{ hashFiles('vcpkg.json') }}
+          restore-keys: |
+            vcpkg-${{ runner.os }}-${{ matrix.os-version }}-${{ matrix.crypto }}-
+
       # Mark all directories as safe so checkouts performed in CMakeLists.txt don't cause "unsafe repository" errors.
       # See https://github.com/actions/checkout/issues/766
       - name: Configure Git
@@ -70,14 +87,14 @@ jobs:
 
       - name: vcpkg check / install dependencies
         working-directory: '${{ github.workspace }}'
-        run: '"${{env.LOCAL_VCPKG_ROOT}}\vcpkg" install --triplet=x64-windows'
+        run: '"${{env.VCPKG_ROOT}}\vcpkg" install --vcpkg-root "${{env.VCPKG_ROOT}}" --triplet=x64-windows'
         shell: cmd
 
       - name: Install dependencies and generate project files
         run: |
           mkdir build
           cd build
-          cmake -S .. -G Ninja -DCMAKE_C_COMPILER=cl -DCMAKE_CXX_COMPILER=cl -DBUILD_TESTS=ON -DBUILD_EXAMPLES=ON -DBUILD_TOOLS=ON "-DCMAKE_TOOLCHAIN_FILE=${{env.LOCAL_VCPKG_ROOT}}/scripts/buildsystems/vcpkg.cmake" -DUSE_CRYPTO=${{matrix.crypto}}
+          cmake -S .. -G Ninja -DCMAKE_C_COMPILER=cl -DCMAKE_CXX_COMPILER=cl -DBUILD_TESTS=ON -DBUILD_EXAMPLES=ON -DBUILD_TOOLS=ON "-DCMAKE_TOOLCHAIN_FILE=${{env.VCPKG_ROOT}}/scripts/buildsystems/vcpkg.cmake" -DUSE_CRYPTO=${{matrix.crypto}}
         shell: cmd
 
       - name: Build projects