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Fix --parallel support in build_ext.build_extensions() #3187

merged 1 commit into from Oct 18, 2019


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In Python 3.5, distutils added a --parallel / -j option to allow extensions to be compiled in parallel. setuptools leverages this by default unless Cython is present because it uses the build_ext provided by Cython instead. Cython overrides build_extensions() entirely assuming that it just calls build_extension (which it did before Python 3.5).
This change defers back to the original build_extensions() call in build_ext after mutating the sources so that --parallel works with Cython properly.

@scoder scoder added this to the 3.0 milestone Oct 18, 2019
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scoder commented Oct 18, 2019

Ah, yes, makes total sense. Thanks!

@scoder scoder merged commit 01e00f6 into cython:master Oct 18, 2019
@Alphadelta14 Alphadelta14 deleted the alphadelta14/build-ext-parallel branch October 18, 2019 10:17
@scoder scoder modified the milestones: 3.0, 0.29.14 Nov 1, 2019
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2 participants