[cfe-dev] Clang PGO and LLVM PGO commandline interface

[Johan Engelen via cfe-dev]

Hello all,
  A while ago, I implemented frontend-based PGO in LDC (very similar to
Clang's) and now I'd like to add IR-based PGO. I want the commandline
interface to be the same (or very similar) to Clang's, but I am having
trouble finding the current state of Clang's PGO commandline flags (and
their meaning related to Clang/LLVM-IR PGO).

Can you give me a pointer to where I can find this, or perhaps give me a
brief overview of the current flags and how to select whether to use
frontend-based or IR-based PGO ?

Thanks a lot,
  Johan
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