First attempt at Windows support

Author: simolus3

.github/workflows/compile_sqlite.yml

@@ -44,7 +44,6 @@ jobs:
       matrix:
         # We only really need this for Ubuntu, but we recommend users run the same
         # steps so we better make sure they work on all platforms.
-        #os: [ubuntu-latest, macos-latest, windows-latest]
         os: [ubuntu-latest, macos-latest]
 
     runs-on: ${{ matrix.os }}
@@ -85,3 +84,46 @@ jobs:
           path: out/
           if-no-files-found: error
           retention-days: 1
+
+  build_sqlite_windows:
+    needs: [download_sqlite]
+    strategy:
+      matrix:
+        arch: [amd64, amd64_x86, amd64_arm64]
+
+    runs-on: windows-latest
+    name: Compile sqlite3 Windows
+    steps:
+      - uses: actions/checkout@v4
+      # - uses: actions/cache@v4
+      #   id: cache_build
+      #   with:
+      #     path: out/
+      #     key: sqlite-prebuilt-${{ runner.os }}-${{ matrix.arch }}-${{ hashFiles('tool/') }}
+
+      - name: Download sqlite3 sources
+#        if: steps.cache_build.outputs.cache-hit != 'true'
+        uses: actions/download-artifact@v4
+        with:
+          name: sqlite3-src
+          path: sqlite3-src
+
+      - uses: dart-lang/setup-dart@v1
+#        if: steps.cache_build.outputs.cache-hit != 'true'
+
+      - uses: ilammy/msvc-dev-cmd@v1
+        with:
+          arch: ${{ matrix.arch }}
+
+      - name: Compile sqlite3
+#        if: steps.cache_build.outputs.cache-hit != 'true'
+        run: |
+          dart run tool/compile_sqlite.dart
+
+      - name: Upload sqlite3 binaries
+        uses: actions/upload-artifact@v4
+        with:
+          name: sqlite3-libs-${{ runner.os }}-${{ matrix.arch }}
+          path: out/
+          if-no-files-found: error
+          retention-days: 1

tool/compile_sqlite.dart

@@ -7,7 +7,7 @@ final defines = const LineSplitter()
     .map((line) => '-D$line')
     .toList();
 
-void main() async {
+void main(List<String> args) async {
   await Directory('out').create();
 
   if (Platform.isLinux) {
@@ -25,6 +25,34 @@ void main() async {
           _compileAndroid(triple, name, sqlite3mc)
       ]
     ], eagerError: true);
+  } else if (Platform.isWindows) {
+    final abiName = args.single;
+    final defines = const LineSplitter()
+        .convert(_defaultDefines)
+        .map((line) => line.trim())
+        .map((line) => '/D$line');
+
+    for (final sqlite3Ciphers in [false, true]) {
+      final args = [
+        '/LD',
+        sqlite3Ciphers
+            ? r'sqlite3-src\sqlite3mc\sqlite3mc_amalgamation.c'
+            : r'sqlite3-src\sqlite3\sqlite3.c',
+        '/DSQLITE_EXPORT=__declspec(dllexport)',
+        '/O2',
+        ...defines,
+        '/I',
+        sqlite3Ciphers ? r'sqlite3-src\sqlite3mc' : 'sqlite3-src\sqlite3',
+        '-o',
+        '/Fe:out\win-$abiName-sqlite3${sqlite3Ciphers ? 'mc' : ''}.dll'
+      ];
+
+      print('Running cl ${args.join(' ')}');
+      final result = await Process.run('cl', args);
+      if (result.exitCode != 0) {
+        throw 'Compiling for $abiName (ciphers: $sqlite3Ciphers) failed: ${result.stdout}\n ${result.stderr}';
+      }
+    }
   }
 }