Welcome to the CHICKEN Scheme pasting service

I've got a foreign shared lib:

=== lib.c
  #include <stdio.h>
  void stat(float d) { 
    printf("from c: d = %.3f, int = %d\n", d, (int)d); 
  }


I wanna use its function stat in my Scheme prog:

=== prog.scm
  (define stat (foreign-lambda void "stat" float))
  (stat 123.1)


I compile and run, and everything is terribly wrong:

  $ gcc -fPIC -shared lib.c -o lib.so 
  $ csc prog.scm -L ./lib.so
  $ ./prog
  from c: d = 36893488147419103232.000, int = -2147483648


Why is my original 123.1 messed up? It works when I use doubles.

for the curious: the paste above fails because 'stat' is implicitly
declared (with double I'm guessing). 

Declaring its signature beforehand fixes it.