Ned Deily <n...@python.org> added the comment:

Can you give a test case demonstrating what is not working?  The Python 
interpreters installed with python.org 10.6+ installers are built to work with 
all versions of macOS from 10.6 on and should be able to build extension 
modules with either gcc or clang as provided by the Xcode or Command Line Tools 
appropriate for the macOS version in use.  And, AFAIK, Python itself has no 
dependency on C++ at all so there should not be a c++ runtime library conflict 
due to Python itself.  Although the initial value of the configuration 
variables are CC=gcc-4.2 and GXX=g++-4.2, when the first compilation of an 
extension module is attempted, Distutils via Lib/_osx_support.py will do some 
work to figure out what compilers are available and modify CC and CXX 
accordingly.  So, for example, on say a macOS 10.13 system with the default 
Command Line Tools, it should use gcc and g++ which are both aliases for clang. 
 And, if necessary, you can always override the default compiler selection by 
explicitly 
 setting the CC and/or CXX environment variables when invoking python.  At 
least that's how it's supposed to work!

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31751>
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