Re: RTEMS patch sweep: stdint.h/inttypes.h

["Joel Sherrill <joel at OARcorp dot com>" <joel dot sherrill at OARcorp dot com>]

Jeff Johnston wrote:
> Hi Nicholas.  See the discussion this last week on the list.  It was 
> initially RTEMS only, but it was suggested it be made shared as the 
> defines will be needed by other non-rtems builds.  Corinna has been part 
> of the conversation.  If Cygwin needs to revert or modify it, I'm ok 
> with Corinna doing that.  I will be away this next week and am getting 
> ready to leave right now.
>
> There already is machine header directories per platform in newlib so 
> perhaps I do not understand your request.
>
> -- Jeff J.
>
> Nicholas Wourms wrote:
>
> > Why is machine/_types.h in a shared directory?

Why shouldn't it be?  For the most part, the type definitions are CPU 
and multilib variant dependent.

> > I guess what I'm saying is: what is the point of adding these defines 
> > globally if they are only being used by rtems?  This stuff is really 
> > platform specific and shouldn't be filled with crazy ifdef logic.  

It is standard "don't redefine this" logic that has been common in
types.h/stdint.h files since the beginning of time.  It is just an
extension of what was already being used to prevent certain
times (time_t?) from being defined in two .h files.

> > However, it seems the damage is done, so I've come up with another 
> > idea.  A better soultion would be to add a "machine" directory for 
> > each platform and put it there.  That way, each platform could modify 
> > it to their needs.  This is how GLIBC does it, so I see no reason why 
> > we can't.

WIthout knowing why glibc did what it did, why is it necessary to
duplicate all those definitions?

> > Cheers,
> > Nicholas
> >
> > P.S. - I'm sorry if I sound a little cranky, it's just that I've been 
> > working on a cygwin project for 6 months now to add a whole bunch of 
> > c99 extensions.  As part of this, I had to create a file of the same 
> > name, but I put it in winsup/cygwin/include/machine/_types.h.

Ralf has been working on converting RTEMS to C99 types for at least
the same length of time.  We just want to reduce the unnecessary
variations and duplication.

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--
Joel Sherrill, Ph.D.             Director of Research & Development
joel@OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
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