cmd/mbf: optionally override non-native flags

This is a clean workaround for configuration differences to save time during development.

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

cmd/mbf/main.go

@@ -72,6 +72,8 @@ func main() {
 		flagCheck bool
 		flagLTO   bool
 
+		flagCrossOverride int
+
 		addr net.UnixAddr
 	)
 	c := command.New(os.Stderr, log.Printf, "mbf", func([]string) error {
@@ -102,7 +104,11 @@ func main() {
 		}
 
 		if cross {
-			rosa.DropCaches(flagArch, rosa.Flags())
+			if flagCrossOverride != -1 {
+				flags = flagCrossOverride
+			}
+
+			rosa.DropCaches(flagArch, flags)
 			if !rosa.HasStage0() {
 				return pkg.UnsupportedArchError(flagArch)
 			}
@@ -129,6 +135,10 @@ func main() {
 		&flagCheck,
 		"check", command.BoolFlag(true),
 		"Run test suites",
+	).Flag(
+		&flagCrossOverride,
+		"cross-flags", command.IntFlag(-1),
+		"Override non-native target preset flags",
 	).Flag(
 		&cm.verboseInit,
 		"v", command.BoolFlag(false),