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https://issues.apache.org/jira/browse/DERBY-3117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538527
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Rick Hillegas commented on DERBY-3117:
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Hi Dan,
There is a catch-22 with building the ant task, but I'm hoping it's relatively
minor. Basically, the build tools would be built with whatever compiler is
visible in $JAVA_HOME together with its default understanding of what the
bootclasspath is. I think the trick here is that our build tasks (the <javac>
calls) are setting bootclasspath to ${empty}, which forces <javac> to rely on
follow-on <classpath> declarations to contain the location of the JDK jars. So
the idea would be to invoke <javac> on the buildtools directory without forcing
bootclasspath to ${empty}. I think this creates a small possibility that
someone could introduce a Java6-specific reference into the buildtools and we
wouldn't notice this until someone else tried to compile Derby in a Java 5
environment. I think I could live with that exposure.
Of course, I haven't mocked this up yet and there could be a bigger catch-22!
> Adjust master build script to require the Java 5 compiler to build Derby
> ------------------------------------------------------------------------
>
> Key: DERBY-3117
> URL: https://issues.apache.org/jira/browse/DERBY-3117
> Project: Derby
> Issue Type: Improvement
> Components: Build tools
> Affects Versions: 10.4.0.0
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Attachments: BuildDefaults.txt, derby-3117-01-enforceJava5-aa.diff,
> derby-3117-01-enforceJava5-ab.diff, derby-3117-01-enforceJava5-ac.diff,
> derby-3117-02-website-aa.diff, derby-3117-03-junit-aa.diff, derby_source.html
>
>
> Require the Java 5 compiler in order to build Derby as approved by the
> community recently:
> http://www.nabble.com/-VOTE--Require-Java-5-%28or-later%29-compiler-to-build-Derby-tf4522491.html#a13030783
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