pitrou commented on PR #50611:
URL: https://github.com/apache/arrow/pull/50611#issuecomment-5060500505

   > The best hypothesis I have goes as follows (this was heavily AI assisted):
   > 
   > We had a similar problem with the ODR violation, but the cause is 
different here (latest xsimd has the ODR fix). The issue arise during LTO where 
the fags `-msve-vector-bits=128` and `-msve-vector-bits=256` get conflated, 
resulting in the 256 version making 128 bits assumptions.
   
   We should find out why. Can we enable `CMAKE_VERBOSE_MAKEFILE` on the 
manylinux build to see all the compiler options for each file? Normally only 
one `-msve-vector-bits` is passed for each compilation unit.


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