pitrou commented on issue #45853:
URL: https://github.com/apache/arrow/issues/45853#issuecomment-2735759649

   Ok, I think these lines are what trigger the rebuilds:
   
https://github.com/apache/arrow/blob/fc0862a25fa2d6aa17df14daa9ad37430d432425/ci/scripts/cpp_build.sh#L267-L268
   
   The problem is that Ninja wants to rebuild when some intermediate files are 
missing:
   ```
   ninja explain: output src/arrow/libarrow.so.p/array_array_base.cc.o doesn't 
exist
   ninja explain: src/arrow/libarrow.so.p/array_array_base.cc.o is dirty
   ```


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