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On Apr 13 11:12, Sebastian Huber wrote: > On 13/04/16 11:07, Corinna Vinschen wrote: > >Ok, one step back. Right now we have newlib's stdio using _off_t and > >newlib's stdio64 _off64_t. The assumption is that on 32 bit platforms > >_off_t is a 32 bit type, thus we need _off64_t and stdio64 to implement > >64 bit file access. > > Ok, the _off_t is 64-bit on the main RTEMS targets. I was not aware that > there is a stdio64. This explains some of my confusion. stdio64 allows to define 32 and 64 bit stdio functions on 32 bit targets. As I said, we're using this in Cygwin just to pamper really old executables from pre-64bit-off_t times, but that requires to have two off_t's on 32 bit. I'm not happy either with this complication and I guess we will drop this compatibility stuff in Cygwin in not too far a future. > >If we change the definitions of _off_t and _off64_t we're bound to break > >newlib and probably not only when being used by Cygwin. > > > >I'd like to suggest the following. If that's exactly what you suggested, > >bear with me, I'just m trying to wrap my head around this in public:) > > > >- Keep _off_t and _off64_t definitions intact. > > > >- Define __off_t in sys/_types.h as the same type as _off_t, unless > > we're running on Cygwin. In that case __off_t should be defined > > as always 64 bit. > > Ok, this makes sense. > > >This should probably go into Cygwin's not yet > > existing machine/_types.h. > > No, the <machine/_types.h> is responsible to define _off_t. ?!? Where's __off_t defined then? Corinna -- Corinna Vinschen Cygwin Maintainer Red Hat
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