Rename make-windows-releases.sh and add source archive generation

.gitignore

@@ -1,3 +1,5 @@
 /build*
+/libdeflate-*-windows-*
+/libdeflate-*.tar.gz
 cscope*
 tags

scripts/gen-release-archives.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -eu -o pipefail
+
+# This script generates source and binary archives that should be posted for
+# each new release of libdeflate.
+
+prefix="libdeflate-$(git describe HEAD | sed 's/^v//')"
+
+# Generate source code archive libdeflate-*.tar.gz
+tarball="${prefix}.tar.gz"
+echo "Generating $tarball"
+git archive --format=tar --prefix="${prefix}/" HEAD \
+	| libdeflate-gzip -12 > "$tarball"
+
+# Generate Windows binary releases libdeflate-*-windows-*-bin.zip
+for arch in 'i686' 'x86_64'; do
+	dir=${prefix}-windows-${arch}-bin
+	zipfile="${dir}.zip"
+	echo "Generating $zipfile"
+	rm -rf build "$dir" "$zipfile"
+	CFLAGS="-Werror" ${arch}-w64-mingw32-cmake -B build -G Ninja \
+		-DLIBDEFLATE_BUILD_TESTS=1 > /dev/null
+	cmake --build build > /dev/null
+	mkdir "$dir"
+	cp libdeflate.h build/libdeflate.{dll,dll.a,a} \
+		build/programs/{benchmark,checksum}.exe "$dir"
+	cp build/programs/libdeflate-gzip.exe "$dir"/gzip.exe
+	cp build/programs/libdeflate-gzip.exe "$dir"/gunzip.exe
+	${arch}-w64-mingw32-strip "$dir"/libdeflate.dll "$dir"/*.exe
+	for file in COPYING NEWS.md README.md; do
+		sed < $file > "$dir/${file}.txt" -e 's/$/\r/g'
+	done
+	(cd "$dir" && zip -q -r "../${zipfile}" .)
+done
+
+echo "Successfully generated release files"