[Chicken-users] passing a large unsigned-int to a foreign-lambda?

[Graham Fawcett]

Hi folks, I have a foreign-lambda like this:

   (define foo (foreign-lambda* int ((unsigned-int32 flags)) ...)

Since it's a uint32, one possible value for "flags" is 2^31. But I
cannot call the procedure with this value.

   (foo (arithmetic-shift 1 31))

returns an error because the argument is not a fixnum. If I try (fxshl
1 31) instead, I get a value of 0, presumably because I'm on a 32-bit
build, which isn't right either.

Any suggestions on how to get around this?

Thanks,
Graham