We should probably get this in the release notes, as many people do indeed want remote debug to work.

Can you tell gdb the base path to use when looking for symbols?  I've not done remote GDB for some time but wouldn't "set substitute-path / //my/sysroot/" work?  Or maybe /usr /my/sysroot/usr?

If gdb can't be told then instead of having to replace all of DEBUG_FLAGS it would be neat if the prefix mapping variables where in another variable that could just be unset.

Ross