Detecting memory leaks

[Alan Third]

I'm investigating some memory that have been reported in the GNUstep
port of Emacs. The reporter says they're getting warnings in the
console about objects being autoreleased when there is no autorelease
pool.

Now, I'm pretty sure I know what's causing that particular problem,
but I don't see these warnings so I can't be sure. Even if I
intentionally break our autorelease pools I get nothing and I can't
work out what I need to do to enable these messages.

I suspect the difference is that they're using gcc and I'm using
clang. I built my own GNUstep install using some instructions I can't
find now.

Any pointers that would help me debug this would be appreciated.

Thanks!
-- 
Alan Third