[slf4j-dev] Cross Building SLF4S against Scala versions

[Ceki Gülcü]

Hi Heiko,

Work nicely indeed. I could successfully execute the 'mvn deploy' 
command as well. By the way, the correct sequence is:

  Run Maven twice:
1. mvn install
2. mvn clean
3. mvn -Pscala-2.7.7 install

Without the intermediary clean the 2.7. compiler does not kick in.

It all seems to nicely fall into place.

On 08/09/2010 8:33 AM, Heiko Seeberger wrote:
> And here comes the solution:
> http://github.com/hseeberger/scala-profiles-demo
>
> Run Maven twice:
> 1. mvn install
> 2. mvn -Pscala-2.7.7 install
>
> You wil get exactly what we need:
> ./scala-profiles-demo_2.7.7
> ./scala-profiles-demo_2.7.7/1.0-SNAPSHOT
> ./scala-profiles-demo_2.7.7/1.0-SNAPSHOT/maven-metadata-local.xml
> ./scala-profiles-demo_2.7.7/1.0-SNAPSHOT/scala-profiles-demo_2.7.7-1.0-SNAPSHOT.jar
> ./scala-profiles-demo_2.7.7/1.0-SNAPSHOT/scala-profiles-demo_2.7.7-1.0-SNAPSHOT.pom
> ./scala-profiles-demo_2.7.7/maven-metadata-local.xml
> ./scala-profiles-demo_2.8.0
> ./scala-profiles-demo_2.8.0/1.0-SNAPSHOT
> ./scala-profiles-demo_2.8.0/1.0-SNAPSHOT/maven-metadata-local.xml
> ./scala-profiles-demo_2.8.0/1.0-SNAPSHOT/scala-profiles-demo_2.8.0-1.0-SNAPSHOT.jar
> ./scala-profiles-demo_2.8.0/1.0-SNAPSHOT/scala-profiles-demo_2.8.0-1.0-SNAPSHOT.pom
> ./scala-profiles-demo_2.8.0/maven-metadata-local.xml
>
> Heiko
>
> On 8 September 2010 08:19, Heiko Seeberger
> <heiko.seeberger at googlemail.com <mailto:heiko.seeberger at googlemail.com>>
> wrote:
>
>     Hi Ceki,
>
>     Different Scala versions are binary incompatible and I don't believe
>     that will change in the near future, even if Martin has said that
>     once. IMHO 2.8.1 will not be binary compatible with 2.8.0. And 2.8.2
>     won't be with 2.8.1 nor with  2.8.0. And of course neither of these
>     is compatible with 2.7.x. If you are interested in the reasons, you
>     will find numerous resources on the web, e.g. [1] or [2]. Maybe
>     starting from 2.9 EPFL will manage to solve that issue.
>
>     But that's not a reason to pack and go home. The solution is simple:
>     Cross-build your libraries and frameworks against all the versions
>     you want to support. If you look at an example of such a library
>     deployed to a Maven style repository you will see that the artifact
>     ID is suffixed with _2.8.0 or whatever Scala version [3]. So there
>     is not only the project version but also the Scala version. SBT [4]
>     makes that very easy, but I think I know a solution for Maven, too.
>
>     Akka has not yet been released (only milestones) and therefore they
>     can target only one Scala version. But they already do it the style
>     I described, i.e. they are ready for multiple versions. Lift already
>     does builds against 2.7.7 and 2.8.0. And there will be others.
>
>     For something as widespread as SLF4J there in NO WAY not supporting
>     2.7.7 plus 2.8.0 plus 2.8.x. It just must be cross-built.
>
>     So your (d) is not an option, but as I already mentioned I hope to
>     find a Maven based solution.
>
>     Heiko
>
>     [1]
>     http://stackoverflow.com/questions/2053265/scala-binary-incompatibility-between-releases
>     [2]
>     http://it-republik.de/jaxenter/news/Scala---Die-Reifepruefung-056248.html
>     [3]
>     http://scala-tools.org/repo-releases/com/weiglewilczek/scalamodules/scalamodules-core_2.8.0/2.0.0.RC2/
>     [4] http://code.google.com/p/simple-build-tool/
>
>     On 7 September 2010 22:59, Ceki Gülcü <ceki at qos.ch
>     <mailto:ceki at qos.ch>> wrote:
>
>         On 07/09/2010 10:53 PM, Ceki Gülcü wrote:
>
>             On 07/09/2010 8:08 PM, Heiko Seeberger wrote:
>
>
>                 As we will probably see Scala 2.8.1 end of this year and
>                 milestones and
>                 release candidates even earlier, this is an important
>                 issue for SLF4S.
>                 How could we deal with that?
>
>
>             There is no way 2.8.1 will be (or can be) incompatible with
>             2.8. The 2.7
>             to 2.8 binary incompatibility was a single fluke occurrence.
>
>
>         2.8.1 will be binary compatible with 2.8.0. See http://bit.ly/93ie5V
>
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>
>
>
>
>     --
>     Heiko Seeberger