Ronald Oussoren <> added the comment:

I different question w.r.t. detection of the clang/llvm version on Apple's 
system compiler: Is it worthwhile to do so? 

If the compiler included in the Xcode 9.3 beta (and hence likely the one in 
Xcode 9.3 final) fixes the performance issue a very large subset of people 
building Python for themselves will get a fixed compiler fairly soon. It would 
then be enough to warn about this issue in a readme file for other users.


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