t-kernel team mailing list archive

[Sebastian Huber <sebastian.huber@xxxxxxxxxxxxxxxxxx>]

On 15/04/16 12:23, Richard Biener wrote:
> On Fri, Apr 15, 2016 at 11:44 AM, Sebastian Huber
> <sebastian.huber@xxxxxxxxxxxxxxxxxx>  wrote:
> > >I work currently on a better FreeBSD compatibility for Newlib.  For
> > >RTEMS we use the network, USB, SD/MMC stacks from FreeBSD.  It would be
> > >nice to use <sys/types.h>, etc. from Newlib directly to compile FreeBSD
> > >user and kernel space files.
> > >
> > >Various FreeBSD source and header files need a typedef __size_t via
> > ><sys/_types.h>.  Unfortunately the GCC provided <stddef.h> uses
> > >
> > >     #if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \
> > >       || defined(__DragonFly__) \
> > >       || defined(__FreeBSD_kernel__)
> > >     /* __size_t is a typedef on FreeBSD 5, must not trash it. */
> > >     #elif defined (__VMS__)
> > >     /* __size_t is also a typedef on VMS.  */
> > >     #else
> > >     #define __size_t
> This looks odd - maybe it was meant to be a #undef?  OTOH there are
> a whole lot of other similar cases there which do not make sense to me...

No, in case __size_t is defined, then we don't end up in this spot. 
stddef.h tests for various guard defines and if none of them is defined, 
then it typedefs size_t and defines all the guard defines to nothing, 
except for __size_t on some targets.

--
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber@xxxxxxxxxxxxxxxxxx
PGP     : Public key available on request.

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