Support for multiple Scala versions #13994
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Relates to #14171, although if we cannot accomplish that here, then just supporting multiple versions is the priority. |
tdyas
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Feb 10, 2022
Implement support for multiple Scala versions in the same repository. Each resolve will be assigned a single Scala version. Scala requires that all Scala-compiled jars on a classpath (i.e, a resolve) be "compatible" with one another (regardless of whether they are third-party jars or jars compiled from first-party sources). For Scala 2.x versions, for example, "compatibility" means that all Scala-compiled jars were compiled with the same minor version of Scala (i.e., 2.12). We can maintain this "Scala compatibility" property for a resolve by assigning the resolve a single Scala version which ensures that there is single Scala version that all of the third-party jars must be compatible with and that all first-party sources are compiled with. Introduce the `--scala-version-for-resolve` option to implement the mapping from resolve to Scala version. The `--scala-version` option is deprecated and will be used as a fallback if the Scala version for a particular resolve is not set in `--scala-version-for-resolve`. Closes #13994.
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This is very related to #13882.
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