build-style/cargo.sh: add

common/build-style/cargo.sh

@@ -0,0 +1,35 @@
+#
+# This helper is for building rust projects which use cargo for building
+#
+
+do_configure() {
+	mkdir -p .cargo
+	# respect makejobs, do cross stuff
+	cat > .cargo/config <<EOF
+[build]
+jobs = ${makejobs#*j}
+target = "${RUST_TARGET}"
+
+[target.${RUST_TARGET}]
+linker = "${CC}"
+EOF
+}
+
+do_build() {
+	: ${make_cmd:=cargo}
+
+	${make_cmd} build --release ${configure_args}
+}
+
+do_check() {
+	: ${make_cmd:=cargo}
+
+	${make_cmd} test --release ${make_check_args}
+}
+
+do_install() {
+	: ${make_cmd:=cargo}
+
+	${make_cmd} install --root="${DESTDIR}/usr" ${make_install_args}
+	rm "${DESTDIR}"/usr/.crates.toml
+}