Junio C Hamano <gitster <at> pobox.com> writes:
>
> On Sat, Feb 7, 2015 at 12:32 PM, Torsten Bögershausen <tboegi <at>
web.de> wrote:
> > I don't know every platform of the planet well enough to be helpful
here,
> > especially the ones which don't follow all the specifications.
> >
> > In other words: As long as we can not guarantee that SSIZE_MAX is
defined,
> > (and is defined to somethong useful for xread()/xwrite() )
> > we should be more defensive here:
> >
> > tweak only on platform where we know it is needed and we know that it
works.
>
> Yup, I agree that is a sensible way to go.
>
> (1) if Makefile overrides the size, use it; otherwise
> (2) if SSIZE_MAX is defined, and it is smaller than our internal
> default, use it; otherwise
> (3) use our internal default.
>
> And leave our internal default to 8MB.
>
> That way, nobody needs to do anything differently from his current build
set-up,
> and I suspect that it would make step (1) optional.
>
something like this:
/* allow overwriting from e.g. Makefile */
#if !defined(MAX_IO_SIZE)
# define MAX_IO_SIZE (8*1024*1024)
#endif
/* for plattforms that have SSIZE and have it smaller */
#if defined(SSIZE_MAX && (SSIZE_MAX < MAX_IO_SIZE)
# undef MAX_IO_SIZE /* avoid warning */
# define MAX_IO_SIZE SSIZE_MAX
#endif
Steps 2 and 3 only , indeed step 1 not needed...
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