Add support for windows

.github/workflows/deps.yaml

@@ -104,9 +104,23 @@ jobs:
           name: freebsd_amd64
           path: deps/freebsd_amd64/libduckdb.a
           retention-days: 1
+  windows_amd64:
+    needs: prepare
+    runs-on: windows-2022
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+      - shell: bash
+        run: make deps.windows.amd64
+      - uses: actions/upload-artifact@v4
+        with:
+          name: windows_amd64
+          path: deps/windows_amd64/libduckdb.a
+          retention-days: 1
   commit:
     runs-on: ubuntu-latest
-    needs: [darwin_amd64, darwin_arm64, linux_amd64, linux_arm64, freebsd_amd64]
+    needs: [darwin_amd64, darwin_arm64, linux_amd64, linux_arm64, freebsd_amd64, windows_amd64]
     steps:
       - uses: actions/checkout@v4
         with:
@@ -118,6 +132,7 @@ jobs:
           rm -f deps/linux_amd64/libduckdb.a
           rm -f deps/linux_arm64/libduckdb.a
           rm -f deps/freebsd_amd64/libduckdb.a
+          rm -f deps/windows_amd64/libduckdb.a
           rm -f duckdb.h
       - uses: actions/download-artifact@v4
         with:
@@ -143,6 +158,10 @@ jobs:
         with:
           name: freebsd_amd64
           path: deps/freebsd_amd64
+      - uses: actions/download-artifact@v4
+        with:
+          name: windows_amd64
+          path: deps/windows_amd64
       - name: Push static libraries
         uses: stefanzweifel/git-auto-commit-action@v5
         with:

.github/workflows/tests.yaml

@@ -13,7 +13,7 @@ jobs:
         shell: bash
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         go: ["1.23"]
       fail-fast: false
     steps:
@@ -23,6 +23,11 @@ jobs:
           go-version: ${{ matrix.go }}
       - name: "Run tests"
         run: make test
+      - uses: actions/upload-artifact@v4
+        with:
+          name: test
+          path: go-duckdb.test.exe
+          retention-days: 1
 
   test_examples:
     name: Test examples

Makefile

@@ -71,3 +71,23 @@ deps.freebsd.amd64: duckdb
 	cd duckdb && \
 	CFLAGS="-O3" CXXFLAGS="-O3" ${DUCKDB_COMMON_BUILD_FLAGS} gmake bundle-library -j 2
 	cp duckdb/build/release/libduckdb_bundle.a deps/freebsd_amd64/libduckdb.a
+
+.PHONY: deps.windows.amd64
+deps.windows.amd64: duckdb
+	if [ "$(shell uname -s | tr '[:upper:]' '[:lower:]')" != "mingw64_nt-10.0-20348" ]; then echo "Error: must run build on windows"; false; fi
+	mkdir -p deps/windows_amd64
+
+	# Copied from the DuckDB repository and fixed for Windows. Ideally, `make bundle-library` should also work for Windows.
+	cd duckdb && \
+	${DUCKDB_COMMON_BUILD_FLAGS} GENERATOR="-G \"MinGW Makefiles\"" gmake release -j 2
+	cd duckdb/build/release && \
+		mkdir -p bundle && \
+		cp src/libduckdb_static.a bundle/. && \
+		cp third_party/*/libduckdb_*.a bundle/. && \
+		cp extension/*/lib*_extension.a bundle/.
+	cd duckdb/build/release/bundle && \
+		find . -name '*.a' -exec ${AR} -x {} \;
+	cd duckdb/build/release/bundle && \
+		${AR} cr ../libduckdb_bundle.a *.obj
+
+	cp duckdb/build/release/libduckdb_bundle.a deps/windows_amd64/libduckdb.a