kou commented on issue #49292:
URL: https://github.com/apache/arrow/issues/49292#issuecomment-3925331724

   https://salsa.debian.org/science-team/arrow/-/merge_requests/1#note_724736
   
   > I think the concern was about armv8l which is 32bit which armv8 (without 
the little endian 32bit variant) is aarch64. So, yes, that regular expression 
is a bit unfortunate. Maybe
   >
   > ```cmake
   > elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm$|armv[4-7]|armv8l")
   >      set(ARROW_CPU_FLAG "aarch32")
   > elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^armv[8]$")
   >      set(ARROW_CPU_FLAG "aarch64")
   > ```
   


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