zero9178 added a comment.

Is the deviation from MSVC behaviour here intentional? MSVC flags allow both 
using a `/` as well as `-` as prefix. That means Both `-Wall` and `/Wall` are 
accepted by MSVC as well as clang-cl and in both compilers currently lead to 
ALL warnings being emitted. So this patch would deviate from that behaviour as 
well as add confusion as every other option behaves the same in MSVC and 
clang-cl, regardless of whether `-` or `/` is used as prefix.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D114651/new/

https://reviews.llvm.org/D114651

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