-malign-double

[Jed Brown]

Barry Smith wrote:
> 
>    What about have configure look for uintptr_t  if it does not exist
> then have configure check if unsigned long long is large enough, if not
> try size_t otherwise barf?

You're right, the compiler will warn about casting the pointer to an
integer of different size, as in

char *Align(char *ptr) {
  unsigned low = 0xf & (unsigned)ptr;
  return ptr - low + ((low+0xf) & ~0xf);
}

although I think this is actually okay (we are explicitly truncating it
further, and I think it is guaranteed that the truncation preserves the
low byte).

By barf I assume you mean just skip the alignment fix-up.

Jed

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