Is -fno-omit-frame-pointer supported on powerpc?

I found a buggy interaction between kgdb and -fno-omit-frame-pointer on
ppc that we're discussing on kgdb-bugreport.

I noticed that ppc is excluded from the list of archs on which
CONFIG_FRAME_POINTER depends (in lib/Kconfig.debug).  Are there
known problems with it?  Or is it just not that useful on ppc?

Thanks,
-Dale