extract common cmd flags

cmd/internal/flags/flags.go

@@ -0,0 +1,27 @@
+package flags
+
+import (
+	"flag"
+)
+
+var OutputFile string
+
+func AddOutputFlags(fs *flag.FlagSet) {
+	fs.StringVar(&OutputFile, "o", "", "Output file")
+}
+
+var Verbose bool
+var BuildEnv string
+var Tags string
+
+func AddBuildFlags(fs *flag.FlagSet) {
+	fs.BoolVar(&Verbose, "v", false, "Verbose mode")
+	fs.StringVar(&Tags, "tags", "", "Build tags")
+	fs.StringVar(&BuildEnv, "buildenv", "", "Build environment")
+}
+
+var Gen bool
+
+func AddCmpTestFlags(fs *flag.FlagSet) {
+	fs.BoolVar(&Gen, "gen", false, "Generate llgo.expect file")
+}