[isabelle-dev] Problems building Isabelle/Scala

[Traytel Dmitriy]

> On 7 Apr 2019, at 12:58, Makarius <makarius at sketis.net> wrote:
> 
> On 06/04/2019 20:09, Makarius wrote:
>> 
>>> Instead of bisect, I took an educated guess after looking at the file history of Admin/components/main. So the first bad commit for me is b578749daa62 (which introduces scala 2.12.8). With its parent isabelle jedit -bf works.
>>> 
>>> Funnily, my operating system installation of scala is 2.12.8 too and I don't have any problems with it.
> 
> Does it mean you can use that other scala-2.12.8 to build Isabelle/Scala?

No, I only meant that I can compile other scala programs with it (not Isabelle/Scala).

> According to the release notes
> https://github.com/scala/scala/releases/tag/v2.12.8 that version is
> notable in introducing a subtle change in the produced JVM byte code.
> There could be something odd with the jars of the Isabelle component, or
> conflicts with slightly different local Scala installations.
> 
> In the worst case we just return to scala-2.12.7, because the above
> update does not look very significant.

That is what I did on my machine for now.

>>> Not sure how to proceed from here.
>> 
>> For the moment you can just return to an older scala component in
>> $ISABELLE_HOME_USER/etc/settings, e.g. like this:
>> 
>>  init_component "$HOME/.isabelle/contrib/scala-2.12.6"
>> 
>> or to whatever other version you see fit.
> 
> Sometimes odd crashes are just a consequence of too little JVM
> heap/stack space.
> 
> I have now updated the defaults to -Xms512m -Xmx2560m -Xss16m (which was
> already standard for Isabelle/Scala itself):
> 
> changeset:   70076:3b3089863eda
> tag:         tip
> user:        wenzelm
> date:        Sun Apr 07 12:44:37 2019 +0200
> files:       etc/settings
> description:
> uniform JVM heap options for Isabelle/Scala tools and scalac (again);

This is probably generally useful but did not help 2.12.8 to build Isabelle/Scala on my machine.

Dmitriy