erichkeane added inline comments.

================
Comment at: clang/lib/Sema/SemaExprCXX.cpp:5400-5401
+                                            SourceLocation KWLoc) {
+  if (!S.getLangOpts().CPlusPlus11)
+    return;
+
----------------
royjacobson wrote:
> erichkeane wrote:
> > royjacobson wrote:
> > > aaron.ballman wrote:
> > > > I think we should always warn on these, not just in C++11.
> > > I'm not convinced we should. My reasoning is that we need a pretty good 
> > > reason to start issuing warnings for 20 years old code. The usage of 
> > > those builtins with deleted functions after C++11 is pretty broken which 
> > > is a pretty good reason, but for earlier language versions they work 
> > > 'fine' and if people want to use C++03 I prefer leaving them at peace :)
> > > 
> > > People on C++03 are also probably using pretty old versions of libstdc++ 
> > > and/or boost type_traits, so this could have some impact.
> > > 
> > > WDYT?
> > > 
> > warnings don't get emitted for code in header files, so at least that part 
> > isn't a concern.  
> Any header files, or just system headers?
Sorry, yes, Phab is a mess on a cell phone... in things included as System 
Headers.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D129170/new/

https://reviews.llvm.org/D129170

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