Windows portability

.github/workflows/build.yml

@@ -0,0 +1,60 @@
+name: build
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install SDL2
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libsdl2-dev
+
+      - name: Build
+        run: make
+
+      - name: Smoke test
+        run: SDL_VIDEODRIVER=dummy ./cliffs --smoke-test
+
+  windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup MSYS2
+        uses: msys2/setup-msys2@v2
+        with:
+          msystem: UCRT64
+          update: true
+          install: >-
+            make
+            pkgconf
+            mingw-w64-ucrt-x86_64-gcc
+            mingw-w64-ucrt-x86_64-SDL2
+
+      - name: Build
+        shell: msys2 {0}
+        run: make CC=gcc
+
+      - name: Smoke test
+        shell: msys2 {0}
+        run: SDL_VIDEODRIVER=dummy ./cliffs.exe --smoke-test
+
+      - name: Package Windows app
+        shell: msys2 {0}
+        run: |
+          mkdir -p dist/cliffs
+          cp cliffs.exe dist/cliffs/
+          cp /ucrt64/bin/SDL2.dll dist/cliffs/
+          cp -r assets levels dist/cliffs/
+
+      - name: Upload Windows app
+        uses: actions/upload-artifact@v4
+        with:
+          name: cliffs-windows
+          path: dist/cliffs

.gitignore

@@ -87,3 +87,8 @@ ENV/
 
 # Rope project settings
 .ropeproject
+
+# Native SDL build outputs
+cliffs
+*.o
+*.dSYM/