eli-schwartz commented on issue #45853:
URL: https://github.com/apache/arrow/issues/45853#issuecomment-2734956196

   No, reconfiguring presumes that the build is stale and something should be 
changed (possibly forcing different compiler command lines to be produced).
   
   I would expect, if it says "directory already configured", that nothing 
should be recompiled unless the source modification timestamp has changed.
   
   
   
   > I do also see warnings about wraps being out of date, if those would 
contribute to the issue:
   
   This warning sounds odd, have the subprojects/*.wrap files actually been 
modified (and how)?
   
   The main reason you'd care about the warning is if you have manually edited 
a wrap file to change e.g. a wrap-git commit version, as without explicitly 
running `meson subprojects update --reset` meson may think the subproject is 
already available and not try running git commands to change the version in 
use. Also, if you've modified the wrap files to add diff_files, similar logic 
applies.
   
   It should in this case have no bearing on whether ninja is forcing existing 
(we hope unchanged) files to be recompiled erroneously.


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