cmd/mbf: optionally register all targets

This enables non-native cures from the daemon.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -67,6 +67,8 @@ func main() {
 
 	var (
 		flagQuiet bool
+		flagQEMU  bool
+		flagArch  string
 		flagCheck bool
 		flagLTO   bool
 
@@ -94,6 +96,17 @@ func main() {
 			flags |= rosa.OptLLVMNoLTO
 		}
 		rosa.DropCaches("", flags)
+		cross := flagArch != "" && flagArch != runtime.GOARCH
+		if flagQEMU || cross {
+			cm.qemu = rosa.Std.Load(rosa.QEMU)
+		}
+
+		if cross {
+			rosa.DropCaches(flagArch, rosa.Flags())
+			if !rosa.HasStage0() {
+				return pkg.UnsupportedArchError(flagArch)
+			}
+		}
 
 		return nil
 	}).Flag(
@@ -101,7 +114,11 @@ func main() {
 		"q", command.BoolFlag(false),
 		"Do not print cure messages",
 	).Flag(
-		&cm.arch,
+		&flagQEMU,
+		"register", command.BoolFlag(false),
+		"Enable additional target architectures",
+	).Flag(
+		&flagArch,
 		"arch", command.StringFlag(runtime.GOARCH),
 		"Target architecture",
 	).Flag(