philnik added a comment.

In D151683#4380877 <https://reviews.llvm.org/D151683#4380877>, @erichkeane 
wrote:

> What is the justification for this?

What exactly are you asking for? Why I'd like to back port it? This would make 
quite a bit of code in libc++ simpler and avoids pit-falls where an attribute 
works in some place in some version but not in another.

> Do other compilers do this?

ICC and NVC++ support this: https://godbolt.org/z/TeMnGdGsY

> Was there an RFC?

No. I guess, since you are asking I should write one for this? Only for the 
removal of `-fdouble-square-bracket-attributes`, or also for back porting this?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D151683/new/

https://reviews.llvm.org/D151683

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