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Re: Why does link-time optimization (LTO) happen at link-time?

I think maybe LLVM's ThinLTO is what you're looking for where whole-program optimization (more or less) happens in middle end.

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I don't know that much about ThinLTO but ThinLTO just works on summaries instead of the full code right? It still seems the linker is the one who reads these summaries (doc: https://clang.llvm.org/docs/ThinLTO.html).

As far as I remember from some LLVM talks, apparently only ThinLTO is kind of usable, full LTO doesn't seem to be fully used.

Just my perception.

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