with any following code (for GCC 3 strict-aliasing).
* numbers.c (scm_make_real), num2float.i.c (FLOAT2NUM): removed
the earlier version of the reordering prevention.
* gc-card.c ("sweep_card"): set scm_gc_running while sweeping.
* gc.c (scm_i_expensive_validation_check): separate expensive
validation checks from cheap ones.
SCM_GC_SET_CELL_WORD, SCM_GC_SET_CELL_OBJECT): New macros.
(SCM_GC_CELL_TYPE, SCM_CELL_WORD, SCM_CELL_OBJECT,
SCM_SET_CELL_WORD, SCM_SET_CELL_OBJECT, SCM_FREE_CELL_CDR,
SCM_GC_SET_CELL_OBJECT): Express in terms of SCM_GC_CELL_*
macros.
(SCM_FREE_CELL_P): Express in terms of SCM_GC_CELL_TYPE.
* inline.h (scm_alloc_cell, scm_alloc_double_cell): Use
SCM_GC_CELL_* macros when accessing free cells.