george.karpenkov added a comment.

> So having an analyzer-config option would be useful for those codebases that 
> are expected to be compiled with less advanced compilers that do not elide 
> copies or not doing it aggressively enough.

I'm not sure it makes sense. From my understanding, that's just how c++17 is 
defined, and that's unrelated to what compiler implementation is used.

> I am not sure though how often the end users end up fine tuning the analyzer.

My guess will be "never" (apart from turning on checkers)


Repository:
  rC Clang

https://reviews.llvm.org/D47671



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