Andrew <andrewfg1...@gmail.com> added the comment:

The build steps were, unpack source, ./configure, make, using default settings 
on a company machine.

The configure_and_make_output.txt I attached should show the whole ./configure 
output. The only difference is that I was using xcode 11.0 for that output- the 
errors and behavior are identical though.

The error only seems to occur when building to a network location. This is most 
of our user space because we oftentimes do builds across platforms with the 
same source. Buliding at locations or out of source builds to /tmp or 
/Users/Shared works fine though. /mathworks is a network location which was 
originally mounted at root, but now we have it mounted at 
/System/Volumes/Data/mathworks. From there, all other network locations are 
available through other mount points. We also have some related symlinks at 
/System/Volumes/Data. I think I need to see how the network access move to 
/Systems/Volumes/Data might have changed and broken things for the python 
build. Likely, something deep in the python build is not working well with our 
new network setup. I will see if I can debug deeper into setup.py and 
PyBuildExt.build_extensions() to see if it's not working right with our network 
setup and to get you a way to reproduce this behavior. It's hard to see exactly 
how the paths get passed to 
 xcode and the compiler though. I'll see what I can get you.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41129>
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