RE: Weird Activation Records (RTS wizards, please help!)

I can't seem to get the Garbage Collector to work properly on MacOS X. When a program triggers the Garbage Collector, it aborts with the following message: a.out: fatal error: scavenge_stack: weird activation record found on stack: 0

I'd be willing to bet large amounts of money that this is due to the macro LOOKS_LIKE_GHC_INFO() returning the wrong value. Read the comments in ghc/rts/Storage.h, particularly the sections on "Address space layout macros" and "Macros for distinguishing code pointers from data pointers". In the latter section, unregisterised compilation on MacOS X should be using Plan C. (Sigbjorn - did you already solve this one?) Cheers, Simon