Author dim
Recipients dim, koobs, mark.dickinson, vstinner
Date 2017-04-20.21:46:32
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This is most likely the same issue we found in, which was reported upstream to LLVM here:, and resulted in a very long and not really productive discussion about whether type punning in this way is officially allowed, or a GNU extension.  I will gladly leave it to language lawyers. :)

In our case, easy fix was to use -fno-strict-aliasing, as we did here:
Date User Action Args
2017-04-20 21:46:32dimsetrecipients: + dim, mark.dickinson, vstinner, koobs
2017-04-20 21:46:32dimsetmessageid: <>
2017-04-20 21:46:32dimlinkissue30104 messages
2017-04-20 21:46:32dimcreate