Bug#1012215: gradle-debian-helper: unknown option --add-opens breaks OpenJDK 11 packages

[Markus Koschany]

Am Mittwoch, dem 01.06.2022 um 15:03 +0200 schrieb Emmanuel Bourg:
> The --add-opens option was introduced in Java 9, so this shouldn't cause an
> issue with Java 11. What error did you get?


The compiler complains about "unknown option --add-opens" when I try to rebuild
kotlin in unstable. 

Starting process 'Gradle build daemon'. Working directory:
/<<PKGBUILDDIR>>/.gradle/daemon/4.4.1 Command: /usr/lib/jvm/java-11-openjdk-
amd64/bin/java -Xbootclasspath/a:/usr/share/java/gradle-helper-
hook.jar:/usr/share/java/maven-repo-helper.jar --add-opens
java.base/java.lang=ALL-UNNAMED -Dfile.encoding=UTF-8 -Duser.country -
Duser.language=en -Duser.variant -cp /usr/share/gradle/lib/gradle-launcher-
4.4.1.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 4.4.1

It might be related to the build-dependency on openjdk-8 but the command
mentions java-11 which is strange. In any case we should be more careful when
we force new options to all packages. A conditional is safer and prevents
regressions.

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