Add WASM support

.github/workflows/cmake-multi-platform.yml

@@ -253,3 +253,57 @@ jobs:
         shell: bash
         run: |
           cmake --build cmake-build/build/android-release-vcpkg --target unit_tests omath
+
+  ##############################################################################
+  # 6)  WebAssembly (Emscripten)  –  Clang / Ninja / wasm32-emscripten
+  ##############################################################################
+  wasm-build-and-test:
+    name: WebAssembly (Emscripten) (wasm32-emscripten)
+    runs-on: ubuntu-latest
+    env:
+      VCPKG_ROOT: ${{ github.workspace }}/vcpkg
+    steps:
+      - name: Checkout repository (with sub-modules)
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install basic tool-chain
+        shell: bash
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build
+
+      - name: Setup Emscripten
+        uses: mymindstorm/setup-emsdk@v14
+        with:
+          version: 'latest'
+
+      - name: Verify Emscripten
+        shell: bash
+        run: |
+          echo "EMSDK=$EMSDK"
+          emcc --version
+          # Verify toolchain file exists
+          ls -la "$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake"
+
+      - name: Set up vcpkg
+        shell: bash
+        run: |
+          git clone https://github.com/microsoft/vcpkg "$VCPKG_ROOT"
+          cd "$VCPKG_ROOT"
+          ./bootstrap-vcpkg.sh
+
+      - name: Configure (cmake --preset)
+        shell: bash
+        run: |
+          cmake --preset wasm-release-vcpkg \
+            -DVCPKG_INSTALL_OPTIONS="--allow-unsupported" \
+            -DOMATH_BUILD_TESTS=ON \
+            -DOMATH_BUILD_BENCHMARK=OFF \
+            -DVCPKG_MANIFEST_FEATURES="imgui;tests"
+
+      - name: Build
+        shell: bash
+        run: |
+          cmake --build cmake-build/build/wasm-release-vcpkg --target unit_tests omath

CMakePresets.json

@@ -327,6 +327,44 @@
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "Release"
       }
+    },
+    {
+      "name": "wasm-base",
+      "hidden": true,
+      "generator": "Ninja",
+      "binaryDir": "${sourceDir}/cmake-build/build/${presetName}",
+      "installDir": "${sourceDir}/cmake-build/install/${presetName}",
+      "cacheVariables": {
+        "CMAKE_MAKE_PROGRAM": "ninja"
+      }
+    },
+    {
+      "name": "wasm-base-vcpkg",
+      "hidden": true,
+      "inherits": "wasm-base",
+      "cacheVariables": {
+        "OMATH_BUILD_VIA_VCPKG": "ON",
+        "CMAKE_TOOLCHAIN_FILE": "$env{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake",
+        "VCPKG_CHAINLOAD_TOOLCHAIN_FILE": "$env{EMSDK}/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake",
+        "VCPKG_INSTALLED_DIR": "${sourceDir}/cmake-build/vcpkg_installed",
+        "VCPKG_TARGET_TRIPLET": "wasm32-emscripten"
+      }
+    },
+    {
+      "name": "wasm-debug-vcpkg",
+      "displayName": "WASM Debug Vcpkg",
+      "inherits": "wasm-base-vcpkg",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug"
+      }
+    },
+    {
+      "name": "wasm-release-vcpkg",
+      "displayName": "WASM Release Vcpkg",
+      "inherits": "wasm-base-vcpkg",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Release"
+      }
     }
   ]
 }