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A week or so ago I managed to chase down the “undefined method for Fixnum” bug to the compiler flags -g -O1 -pipe -fno-common -DRUBY_EXPORT -fschedule-insns2. For now you can get rid of the bug by compiling -O1 instead of switching to gcc3. I haven’t had time to track it down further, mostly because I ran out of time and the man page doesn’t specify what -O1 really contains.

Hopefully some smarter eyeballs than mine can jump on this and figure out if GCC is wrong or if Ruby is missing a volatile somewhere.