Ronald Oussoren <> added the comment:

Is there anything we (the CPython developers) can do about this? 

If I read the issue correctly clang 5.x generates faster binaries than clang 
3.x and 4.x.  If that is indeed the issue there's probably not much we can do 
about this. 

BTW. I'm -1 on building the installer with anything but the compiler included 
in Xcode (and it would be nice to build with a recent version of Xcode to use 
an up-to-date compiler and SDK)


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