debug flag

Hi,

If I want to compile the PostgreSQL 6.2.1 code with the -g flag, which Makefile
should I add it. I would like to run it thru a debugger. I am compiling it
with gcc; so I should be able to use xgdb, right?

The sort cost in the planner is assumed to be 0. So, there is an unfair bias
towards sort-merge join in the optimizer. If I want to add a sort cost, will
it be enough to add it in the make_sortplan() function in 
optimizer/plan/planner.c.
Is the size of the relation to be sorted estimated at that time?
If not what is the best way to do this?

Thanks
--shiby