I will disclose my total compensation (but not my salary) to competent recruiters/headhunters from good companies. The reason I disclose total comp is that it enables a like-for-like comparison. Now, because these recruiters know my current package, they will only contact me about substantially larger opportunities. I think this is a win-win. Based on my experience so far, I don't think that disclosing my total comp necessarily 'anchors' the package for the new role.