[llvm-dev] How lld invoke LTO or thinLTO and is there some cases and some method to get the step-by-step message for me to understand how LTO worked?

[半缘君 via llvm-dev]

Hi:
    I want to learn  how LTO and thinLTO work? But I'm confused how lld invoked either library. How can I find it in lld. Should i be familiar with lld source code? And i also think if there is some easy test case and with step-by- step debugging or some log messages can help me learn this? Is there some method can do stuff like this?
  Thank you very much.
   ZhengXianLi
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