Build on whitelisted flavors

product_flavors.gradle

{
    // Preferences => Compiler => Gradle => VM Options. Add -DflavorWhitelist=flavor1,flavor2
    // Omit -DflavorWhitelist for all flavors.
    def flavorMap = [
        flavor1: {
          // flavor stuff
        },
        flavor2 : {
          // flavor 2 stuff
        }
    ]

    def whitelist = flavorMap.keySet()
    def whitelistProp = System.getProperty("flavorWhitelist")
    if (whitelistProp != null) {
      whitelist = whitelistProp.split(",")
    }

    whitelist.each { flavorName ->
      "$flavorName" flavorMap.get(flavorName)
    }
  }