jh7370 wrote:

> > > Do we care about performance on MSVC ?
> > 
> > 
> > Just responding to this point (although I accept it's moot in the current 
> > context): yes we care about performance when building with MSVC - our 
> > downstream toolchain is hosted on Windows. I'm sure we're not the only 
> > Windows client either.
> 
> Do you not bootstrap with clang-cl after building with MSVC? I'd expect that 
> might help at least put you on the same performance tradeoffs as other users, 
> if not be outright better.

I believe so (I'm not involved with the details of the full build process, so 
not entirely sure how it all fits together), but it still impacts how long the 
bootstrap build would take, plus internal users (like myself) don't always do 
the 2 stage build, since we just want a working compiler. Anyway, I'm sure 
there are others out there who don't do the bootstrap build for one reason or 
another.

https://github.com/llvm/llvm-project/pull/122366
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