[issue41129] setup.py test for macOS SDK files may incorrectly classify files in other file systems

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

> As a reminder when implementing: ....

The whole configure machinery needs work :-(.

Disabling looking in /usr/local should IMHO be an explicit choice when building, not something inferred from the presence of "-isysroot" in the compiler flags because that flag can be left out from most builds as Xcode hasn't shipped with multiple SDKs for a long while.

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<https://bugs.python.org/issue41129>
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