zixuan-wu added a comment.

In D115921#3224284 <https://reviews.llvm.org/D115921#3224284>, @jrtc27 wrote:

> but also with RISC-V extensions not being changed once ratified any more 
> (changes mean new extensions entirely, not new versions)

I don't think so. Or why is there version in RISC-V spec? 
And not only for standard extension, but also it's needed in custom extension.

BTW, it's been supported to parse version of -march in clang side.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D115921/new/

https://reviews.llvm.org/D115921

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