[PR] build: enable -Xfatal-warnings for Scala 2 and -Werror for Scala 3 [pekko-http]

["He-Pin (via GitHub)" <gi...@apache.org>]

He-Pin opened a new pull request, #1109:
URL: https://github.com/apache/pekko-http/pull/1109

   ### Motivation
   Treating warnings as errors ensures that deprecated API usage and other code quality issues are caught at compile time rather than accumulating silently.
   
   ### Modification
   - Add `-Xfatal-warnings` to Scala 2 `scalacOptions` in `Common.scala`
   - Add `-Werror` to Scala 3 `scalacOptions`
   - Remove `-Wconf:cat=deprecation:s` for Scala 3 so deprecation warnings are no longer silenced
   - Exclude `-Xfatal-warnings` from `Compile / doc` scope to avoid doc generation failures
   
   ### Result
   All compiler warnings are now treated as errors, enforcing higher code quality and catching deprecated API usage at compile time.
   
   ### Tests
   - CI will verify compilation
   
   ### References
   None — build configuration improvement


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Re: [PR] build: enable -Xfatal-warnings for Scala 2 and -Werror for Scala 3 [pekko-http]

["He-Pin (via GitHub)" <gi...@apache.org>]

He-Pin merged PR #1109:
URL: https://github.com/apache/pekko-http/pull/1109


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