-XX:+TraceClassUnloading enabled w/ -Xloggc ?

[Charlie Hunt]

We stumbled across this last week ... and now curious.

With -Xloggc, -XX:+TraceClassUnloading is also enabled.  But, with other GC related command line options such as; -XX:+PrintGCDetails, -XX:+PrintGC, -XX:+PrintHeapAtGC, etc. -XX:-TraceClassUnloading remains disabled by default.

Anyone know the history that led to the decision to only enable +TraceClassUnloading with -Xloggc, and not with say +PrintGCDetails?

thanks,

charlie ...