Easy cross compilation

Makefile

@@ -0,0 +1,30 @@
+cross: clean
+	cargo build --release --target x86_64-pc-windows-gnu
+	cargo build --release --target x86_64-unknown-linux-musl
+	cargo build --release --target i686-unknown-linux-musl
+	cargo build --release --target i686-pc-windows-gnu
+
+	mkdir -p release/pngrip_x86_64-pc-windows-gnu
+	mkdir -p release/pngrip_x86_64-unknown-linux-musl
+	mkdir -p release/pngrip_i686-unknown-linux-musl
+	mkdir -p release/pngrip_i686-pc-windows-gnu
+
+	cp LICENSE release/pngrip_x86_64-pc-windows-gnu
+	cp LICENSE release/pngrip_x86_64-unknown-linux-musl
+	cp LICENSE release/pngrip_i686-unknown-linux-musl
+	cp LICENSE release/pngrip_i686-pc-windows-gnu
+
+	cp target/x86_64-pc-windows-gnu/release/pngrip.exe release/pngrip_x86_64-pc-windows-gnu
+	cp target/x86_64-unknown-linux-musl/release/pngrip release/pngrip_x86_64-unknown-linux-musl
+	cp target/i686-unknown-linux-musl/release/pngrip release/pngrip_i686-unknown-linux-musl
+	cp target/i686-pc-windows-gnu/release/pngrip.exe release/pngrip_i686-pc-windows-gnu
+
+	cd release && \
+	zip -r pngrip_x86_64-pc-windows-gnu pngrip_x86_64-pc-windows-gnu/ && \
+	zip -r pngrip_x86_64-unknown-linux-musl pngrip_x86_64-unknown-linux-musl && \
+	zip -r pngrip_i686-unknown-linux-musl pngrip_i686-unknown-linux-musl && \
+	zip -r pngrip_i686-pc-windows-gnu pngrip_i686-pc-windows-gnu
+
+
+clean:
+	rm -rf release