running two independent Cygwin DLLs?

[DJ Delorie]

> How do you guys do it?

printf and strace are popular ;-)

Seriously, I have a batch file that copies a given cygwin dll to all
the places it resides on my hard drive, and I have a cache of known
good dlls to restore from.  When I'm debugging dll problems, the first
thing to do is get out of bash and make sure that the *only* cygwin
program you're running is the one you're debugging (and/or gdb).

Or, I just make sure the debug dll is in the current directory with my
test program.