I looked at the patch and read the problem description, but it's not obvious to me where the flaw is. Do you have any more detail (traceback, repro)?

I tried to reproduce it by building pyzmq, but it built fine:

$ $SETUPTOOLS_USE_DISTUTILS='local' pip-run --no-binary pyzmq pyzmq
Collecting pyzmq
  Downloading pyzmq-22.3.0.tar.gz (1.2 MB)
     |████████████████████████████████| 1.2 MB 5.9 MB/s            
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: pyzmq
  Building wheel for pyzmq (pyproject.toml) ... done
  Created wheel for pyzmq: filename=pyzmq-22.3.0-cp310-cp310-macosx_10_9_universal2.whl size=1398560 sha256=4fc39ea9b87811527d0a4646025fc45a95a12ba8ea17e9208a35b2c237f5424b
  Stored in directory: /Users/jaraco/Library/Caches/pip/wheels/5c/8a/96/75ce2fe82d6ff5907f6c409b4ee48b8e7876d56047f34aaafa
Successfully built pyzmq
Installing collected packages: pyzmq
Successfully installed pyzmq-22.3.0
Python 3.10.0 (v3.10.0:b494f5935c, Oct  4 2021, 14:59:20) [Clang 12.0.5 (clang-1205.0.22.11)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

has_function broken when CCompiler.output_dir is set. #64

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`has_function` broken when `CCompiler.output_dir` is set. #64