ZarkoCA added inline comments.

================
Comment at: clang/include/clang/Basic/DiagnosticSemaKinds.td:3255-3256
+def warn_not_xl_compatible
+    : Warning<"requested alignment of arguments 16 bytes or greater is not"
+              " compatible with previous versions of the AIX XL compiler">,
+      InGroup<DiagGroup<"builtin-assume-aligned-alignment">>;
----------------
aaron.ballman wrote:
> ZarkoCA wrote:
> > aaron.ballman wrote:
> > > ZarkoCA wrote:
> > > > aaron.ballman wrote:
> > > > > ZarkoCA wrote:
> > > > > > aaron.ballman wrote:
> > > > > > > Should we be talking about the AIX XL compiler in a Clang 
> > > > > > > diagnostic?
> > > > > > I see your point. Sorry if this isn't what is supposed to be done 
> > > > > > or if it doesn't a good precedent.
> > > > > > 
> > > > > > The reasons for adding this warning is that our back end 
> > > > > > implementation isn't totally compatible with XL now and, while 
> > > > > > buggy, users on AIX may expect clang and xlclang to be compatible 
> > > > > > since AIX is the reference compiler.  The xlclang name implies it's 
> > > > > > clang based and it's possible for users to expect some sort of 
> > > > > > binary compatibility.
> > > > > > 
> > > > > > I see your point. Sorry if this isn't what is supposed to be done 
> > > > > > or if it doesn't a good precedent.
> > > > > 
> > > > > No worries, it's a good discussion to have! We have some MSVC and GCC 
> > > > > compatibility warnings, so there's precedent for naming other 
> > > > > compilers. Now that you've moved the diagnostic into an AIX 
> > > > > compatibility diagnostic group, I am more comfortable with it. Thanks!
> > > > Thanks, glad it's better now. 
> > > I missed this last time, sorry, but is "arguments" actually necessary for 
> > > the diagnostic or can that be dropped?
> > It actually isn't correct, the warning should apply only to members of 
> > structs.  Thanks for bringing it to my attention again, I also missed this 
> > the last time. 
> Huttah for code review working as intended! :-)
Indeed, thank you for the timely reviews. 


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D105660/new/

https://reviews.llvm.org/D105660

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