MaskRay added a comment.

`-march=` `-mcpu=` `-mtune=` are from GCC and they traditionally have many 
opinions on the features.
If GCC is going to have `-march=help`, I think adding `-march=help` to Clang to 
match is fine.
But I'd really like to avoid aliases for non-compatibility reasons. They just 
cause confusion and make users undecided about which one is canonical.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D146054/new/

https://reviews.llvm.org/D146054

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