jankratochvil added a comment.

In D66398#1635344 <https://reviews.llvm.org/D66398#1635344>, @labath wrote:

> Since it seems that there is a need for disambiguation (libc++ can be 
> configured to have any name for the inline namespace, so there's no way to 
> make its regex not match the libstdc++ one),


This is regression from D57466 <https://reviews.llvm.org/D57466>. If you 
configure libc++ to have the same name ("__cxx11") as libstdc++ then LLDB 
really cannot recognize it is libc++ behind.

> I think we should just use the registration order to disambiguate. Then we 
> just need to make sure the libstdc++ formatter is registered before the 
> libc++ one, which should be both easy to achieve and understandable.
> 
> Since you've recently touched this code, how hard do you think it would be to 
> exchange the std::map in FormattersContainer for a std::vector? Would you be 
> willing to give that a try?

From IRC:
That `std::vector` there is not easy.  First some methods were already using 
`.find()` on it so I had to change them to iterate through that vector.
Also some iterating in `FormattersContainer` (`Delete_Impl`, `GetExact_Impl`) 
were now iterating for comparison despite they could use `.find()` so by moving 
to `std::vector` we lose this improvement possibility.
labath: if replace that by a single entry then the nondeterminism goes away
labath: `std::.*::list -> { if (inline_namespace == "__cxx11") return 
"libstdc++ formatter" else return "libc++ formatter" }`

I have somehow find that dispatching implemented C++ not so simple, why not 
just to remove the ambiguity from the regexes?


Repository:
  rLLDB LLDB

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D66398/new/

https://reviews.llvm.org/D66398



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