tschuett added inline comments.

================
Comment at: clang/include/clang-c/Index.h:3448
+  CXCallingConv_AArch64SVEPcs= 17,
+  CXCallingConv_SwiftAsync = 18,
 
----------------
tschuett wrote:
> aaron.ballman wrote:
> > peterwaller-arm wrote:
> > > peterwaller-arm wrote:
> > > > It shouldn't matter in principle (... "but in practice" ...) we should 
> > > > probably avoid renumbering existing things in the enum and instead add 
> > > > to the end of it.
> > > > 
> > > > Nit, this is missing a space before the equals.
> > > > Nit, SVE is an acronym, so is PCS, so capitalization should be 
> > > > consistent between the two. I see 'PCS' capitalized in AAPCS for 
> > > > example so probably all upper case makes the sense.
> > > > 
> > > I retract my sloppy "it shouldn't matter in principle [at the source 
> > > level]", of course it does matter, and it likely matters in this case 
> > > (see 'alias for compatibility' comment above).
> > > 
> > > To be more specific, changing the enum is an ABI break, and breaks if 
> > > these things are ever serialized and therefore not something you want to 
> > > do.
> > +1 -- I was just making that comment when you beat me to it.
> Could you please add your CC as 18 and add a comment the next CC will 19 and 
> do not touch the other ones.
Do you want to add a `static_assert` to prevent people from doing stupid things?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D124998/new/

https://reviews.llvm.org/D124998

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