configure: now you can do multiple compilers!

configure

@@ -14,26 +14,30 @@ RUSTFLAGS='-Copt-level=z -Ccodegen-units=1 -Cpanic=abort -Clto=y \
 	-Cstrip=symbols -Ctarget-cpu=native \
 	--extern sysexits=build/o/libsysexits.rlib'
 
-case "$@" in
+if [ "$1" = "clean" ]; then
-	clang)
+	rm *.mk || true
-		CFLAGS="$CFLAGS -Wall"
+	exit 0
-		;;
+fi
-	clean)
+
-		rm *.mk || true
+while test -n "$1"; do
-		exit 0
+	case "$1" in
-		;;
+		clang)
-	gcc)
+			CFLAGS="$CFLAGS -Wall"
-		CFLAGS="$CFLAGS -s -Wl,-z,noseparate-code,-z,nosectionheader -flto"
+			;;
-		;;
+		gcc)
-	'rustc +nightly')
+			CFLAGS="$CFLAGS -s -Wl,-z,noseparate-code,-z,nosectionheader -flto"
-		RUSTFLAGS="+nightly -Zlocation-detail=none $RUSTFLAGS"
+			;;
-		;;
+		'rustc +nightly')
-	'') ;;
+			RUSTFLAGS="+nightly -Zlocation-detail=none $RUSTFLAGS"
-	*)
+			;;
-		printf 'Usage: %s [compiler]\n' "$0"
+		*)
-		exit 64 # sysexits.h(3) EX_USAGE
+			printf 'Usage: %s [clean | compiler]\n' "$0"
-		;;
+			exit 64 # sysexits.h(3) EX_USAGE
-esac
+			;;
+	esac
+
+	shift
+done
 
 printf 'CFLAGS=%s\n' "$CFLAGS" >cc.mk
 printf 'RUSTFLAGS=%s\n' "$RUSTFLAGS" >rustc.mk