Add target to cross-compile a Windows binary

Author: rasky

Makefile

@@ -2,15 +2,20 @@
 
 all:
 	@echo "Usage:"
-	@echo "•  make release    - build release binary on Mac"
-	@echo "•  make linux      - build release binary on Linux through Docker"
+	@echo "•  make release        - build release binary on macOS"
+	@echo "•  make cross-linux    - build release binary on Linux through Docker"
+	@echo "•  make cross-windows  - build release binary on Windows"
 
 release:
 	go build -ldflags '-s -w' -o g64drive-mac.binary
 	upx --quiet --quiet --lzma g64drive-mac.binary
 
-linux:
+cross-linux:
 	docker build -t g64drive_linux .
 	docker run --rm --entrypoint cat g64drive_linux /src/g64drive_linux >g64drive-linux64.binary
 	chmod +x g64drive-linux64.binary
 	upx --quiet --quiet --lzma g64drive-linux64.binary
+
+cross-windows:
+	env GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC="x86_64-w64-mingw32-gcc" go build -ldflags '-s -w'
+	upx --quiet --quiet --lzma g64drive.exe