(PTR_INT_TYPE) [!defined __PTRDIFF_TYPE__]:

(PTR_INT_TYPE) [!defined __PTRDIFF_TYPE__]:
Define to ptrdiff_t, without bothering to check HAVE_STDDEF_H.
(This type really should be intptr_t, but that's a C99ism.)
(_obstack_memcpy): Remove: all uses changed to memcpy.
Include <string.h> unconditionally.
(struct obstack): Assume __STDC__ for types of members
chunkfun, freefun, extra_arg.
(_obstack_newchunk, _obstack_free, _obstack_begin, _obstack_begin_1,
_obstack_memory_used, obstack_alloc_failed_handler, obstack_init,
obstack_begin, obstack_specify_allocation,
obstack_specify_allocation_with_arg, obstack_chunkfun,
obstack_freefun, obstack_free) [! (defined __STDC__ && __STDC__)]:
Remove unprototyped decls and the macros that use them.