[MacPorts] #39793: Allow custom Java options to launch sbt

[MacPorts]

#39793: Allow custom Java options to launch sbt
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 Reporter:  luc_j_bourhis@…  |      Owner:  macports-tickets@…
     Type:  request          |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.1.3
 Keywords:                   |       Port:  sbt
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 The default Java options in /opt/local/share/sbt/sbt may not suit every
 user. For example, I like to reduce the memory footprint for some projects
 by using -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC and then by tuning
 -Xms and -Xmx.
 Thus I propose the attached patch that lets user define their custom
 option in ~/.sbtconfig

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Ticket URL: <https://trac.macports.org/ticket/39793>
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