version rom68k compiled by gcc-v4.4.5
=========================================
gdb-5.2.1 yes fails
gdb-6.5a yes fails
gdb-6.6a yes
gdb-6.7a no
gdb-6.8a no
gdb-7.0.1a no
gdb-7.3.1 no success
so it seems gdb-v6.6a was the last one supporting rom68k, then they dropped