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https://issues.apache.org/jira/browse/LUCENE-4335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14238643#comment-14238643
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Mike Drob commented on LUCENE-4335:
-----------------------------------

I might be missing some of the more historical context, but why are generated 
sources part of SVN? I've seen other projects make compile depend on generate 
and that way there is no risk of attempting to edit generated files.

The disadvantages of this approach are increased build time and possibly not as 
portable across platforms, but I think those can both be worked through given 
enough time.

> Builds should regenerate all generated sources
> ----------------------------------------------
>
>                 Key: LUCENE-4335
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4335
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>         Attachments: LUCENE-4335.patch, LUCENE-4335.patch, LUCENE-4335.patch
>
>
> We have more and more sources that are generated programmatically (query 
> parsers, fuzzy levN tables from Moman, packed ints specialized decoders, 
> etc.), and it's dangerous because developers may directly edit the generated 
> sources and forget to edit the meta-source.  It's happened to me several 
> times ... most recently just after landing the BlockPostingsFormat branch.
> I think we should re-gen all of these in our builds and fail the build if 
> this creates a difference.  I know some generators (eg JavaCC) embed 
> timestamps and so always create mods ... we can leave them out of this for 
> starters (or maybe post-process the sources to remove the timestamps) ...



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