[PATCH 1/2 v4] libc-internal.h: add ALIGN helper macros

[Roland McGrath]

> On Monday 03 June 2013 15:12:05 Roland McGrath wrote:
> > I think we should be using inlines rather than macros any time we don't
> > have a strong reason to use macros.
> 
> generally we don't do caps inlines though ?  

No, they would be lower-case names.

> and using inlines means we now have to deal with types.  the current one
> works with any size and does the right thing.  if i wrote an inline, i'd
> have to pick a type (size_t? int?  long? uint64_t? uintmax_t?) and then
> there'd be ugliness with signed vs unsigned, implicit casts, implicit
> truncation, overhead with casting up to larger than natural types (like
> 64bit on a 32bit system), etc...

I assumed these were meant for addresses, so uintptr_t would always be fine.