[GitHub] asitstands opened a new issue #10295: Build failure with recent versions of cython and setuptools

[GitBox <gi...@apache.org>]

asitstands opened a new issue #10295: Build failure with recent versions of cython and setuptools
URL: https://github.com/apache/incubator-mxnet/issues/10295
 
 
   `make cython` fails with the following errors. My environment is Arch linux with python 3.6.4, cython 0.28.1, and setuptools 39.0.1. I got these errors after recent update of cython.
   
   ```
   Compiling mxnet/cython/ndarray.pyx because it changed.
   Compiling mxnet/cython/symbol.pyx because it changed.
   [1/2] Cythonizing mxnet/cython/ndarray.pyx
   
   Error compiling Cython file:
   ------------------------------------------------------------
   ...
   # Licensed to the Apache Software Foundation (ASF) under one
   ^
   ------------------------------------------------------------
   
   mxnet/cython/ndarray.pyx:1:0: 'mxnet/_cy3/.ndarray' is not a valid module name
   Traceback (most recent call last):
     File "setup.py", line 108, in <module>
       ext_modules=config_cython(),
     File "setup.py", line 96, in config_cython
       return cythonize(ret)
     File "/usr/lib/python3.6/site-packages/Cython/Build/Dependencies.py", line 1026, in cythonize
       cythonize_one(*args)
     File "/usr/lib/python3.6/site-packages/Cython/Build/Dependencies.py", line 1146, in cythonize_one
       raise CompileError(None, pyx_file)
   Cython.Compiler.Errors.CompileError: mxnet/cython/ndarray.pyx
   ```
   Downgrading cython to 0.27.3 resolves this but gives warnings and different errors.
   ```
   Warning: Extension name 'mxnet/_cy3/.ndarray' does not match fully qualified name 'ndarray' of 'mxnet/cython/ndarray.pyx'
   Warning: Extension name 'mxnet/_cy3/.symbol' does not match fully qualified name 'symbol' of 'mxnet/cython/symbol.pyx'
   Compiling mxnet/cython/ndarray.pyx because it changed.
   Compiling mxnet/cython/symbol.pyx because it changed.
   [1/2] Cythonizing mxnet/cython/ndarray.pyx
   [2/2] Cythonizing mxnet/cython/symbol.pyx
   running build_ext
   error: each element of 'ext_modules' option must be an Extension instance or 2-tuple
   ```
   If I run `python setup.py build_ext --with-cython` (without `--inplace`), the build succeeds with cython 0.27.3.
   

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