Refactor bind control

include/quic.go

@@ -0,0 +1,7 @@
+//go:build with_quic
+
+package include
+
+import _ "github.com/sagernet/sing-dns/quic"
+
+const WithQUIC = true

include/quic_stub.go

@@ -0,0 +1,21 @@
+//go:build !with_quic
+
+package include
+
+import (
+	"context"
+
+	"github.com/sagernet/sing-dns"
+	E "github.com/sagernet/sing/common/exceptions"
+	N "github.com/sagernet/sing/common/network"
+)
+
+const WithQUIC = false
+
+var ErrQUICNotIncluded = E.New(`QUIC is not included in this build, rebuild with -tags with_quic`)
+
+func init() {
+	dns.RegisterTransport([]string{"quic", "h3"}, func(ctx context.Context, dialer N.Dialer, link string) (dns.Transport, error) {
+		return nil, ErrQUICNotIncluded
+	})
+}