On 3/13/06, Xavier Leroy wrote: > > You haven't declared caml_alloc (include ), so the C > compiler assumes it returns an int instead of a value, and generates > wrong code. Funny that I didn't spot this one. Good to know that one should look out for this problem when making sure that code remains portable to 64-bit machines. I think C-compilers should by default issue a warning on platforms where the size of int may be different from the size of a pointer instead of silently inventing a function prototype that is very likely to crash. Regards, Markus