After JDK-8318913, trying to cross-compile to a different endian target than the build host is using, will cause the interim image generation to fail:

[buildjdk] Creating interim jimage
Error: specified --endian LITTLE_ENDIAN does not match endianness of target platform linux-s390
java.io.IOException: specified --endian LITTLE_ENDIAN does not match endianness of target platform linux-s390
        at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.createImageProvider(JlinkTask.java:574)
        at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.createImage(JlinkTask.java:410)
        at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.run(JlinkTask.java:285)
        at jdk.jlink/jdk.tools.jlink.internal.Main.run(Main.java:56)
        at jdk.jlink/jdk.tools.jlink.internal.Main.main(Main.java:34)
InterimImage.gmk:47: recipe for target '/localhome/git/jdk-BAR/build/linux-s390x/support/interim-image/bin/java' failed

This has only been spotted when cross-compiling from x64 to s390x, but it seems to be a general endianness problem.