Mark H Weaver authored Apr 06, 2016 and Andy Wingo committed Mar 01, 2017

This assumption does not hold on systems that use the LLP64 data model.

Partially fixes <https://debbugs.gnu.org/22406>.
Reported by Peter TB Brett <peter@peter-b.co.uk>.

* libguile/numbers.h (scm_t_inum): Move here from numbers.c, and change
  to be equivalent to 'long' (formerly 'scm_t_signed_bits').
  (SCM_MOST_POSITIVE_FIXNUM, SCM_MOST_NEGATIVE_FIXNUM): Define based on
  SCM_I_FIXNUM_BIT instead of SCM_T_SIGNED_BITS_MAX.
  (SCM_I_INUM): Adjust definitions to return a 'scm_t_inum', and avoiding
  the assumption that SCM_UNPACK returns a 'long'.
* libguile/numbers.c (scm_t_inum): Move definition to numbers.h.
  Verify that 'scm_t_inum' fits within a SCM value.
  (scm_i_inum2big): Remove preprocessor code that forced a compile error
  unless sizeof (long) == sizeof (void *).