disable newlib

Manuel Coutinho manuel.coutinho at edisoft.pt
Mon Aug 18 10:59:15 CDT 2008


Ok

I will wait for the patch and look into it.

Thanks!

Manuel Coutinho
Software Engineer - Space
EDISOFT, S.A. 
Rua Quinta dos Medronheiros - Lazarim 
Apartado 382 Monte de Caparica 
2826-801 Caparica Portugal


> -----Original Message-----
> From: ray [mailto:rayx.cn at gmail.com]
> Sent: Monday, August 18, 2008 4:42 PM
> To: Manuel Coutinho
> Cc: 'Ralf Corsepius'; 'Joel Sherrill'; rtems-users at rtems.com
> Subject: Re: disable newlib
> 
> I think you can wait for a few more days on YanMiao's patch and have a
> try.  It may not the exact one you want, but it can save you some extra
> work. And, it has been test with sptest and tmtest.
> As Joel said, the patch dose not disable the newlib, but it remove some
> unnecessary linkage when generating the binary.
> 
> > Manuel Coutinho
> > Software Engineer - Space
> >
> >   cid:image002.jpg at 01C7EEE1.32B7B120
> >
> > EDISOFT, S.A.
> > Rua Quinta dos Medronheiros - Lazarim
> > Apartado 382 Monte de Caparica
> > 2826-801 Caparica Portugal
> >
> >
> >
> >> -----Original Message-----
> >> From: Ralf Corsepius [mailto:ralf.corsepius at rtems.org]
> >> Sent: Monday, August 18, 2008 4:02 PM
> >> To: Manuel Coutinho
> >> Cc: 'Joel Sherrill'; 'xu ray'; rtems-users at rtems.com
> >> Subject: RE: disable newlib
> >>
> >> On Mon, 2008-08-18 at 15:57 +0100, Manuel Coutinho wrote:
> >>
> >>> Hi
> >>>
> >>> We are trying to make possible a configuration (using the configure
> >>>
> >> script)
> >>
> >>> where RTEMS does not have newlib (open, close, malloc, etc) and other
> >>>
> >> things
> >>
> >>> so that a minimal footprint can be achieved.
> >>>
> >>> At this stage, we are just checking how much effort is required to
> >>>
> >> perform
> >>
> >>> this. I would suggest to place #ifdef inside the RTEMS source code so
> >>>
> >> that
> >>
> >>> the unnecessary calls are not made. However, there is more work needed
> >>>
> >> here.
> >>
> >>> I've tried to take out most of the calls to libc and other things that
> >>>
> >> we
> >>
> >>> don't need from the RTEMS source code (e.g rtems_termios_init, etc)
> and
> >>>
> >> the
> >>
> >>> footprint has been reduced from ~70 KiB to ~37KiB, but we need to go
> >>>
> >> further
> >>
> >>> and remove all dead code. Since RTEMS itself makes calls to newlib or
> >>>
> >> libc,
> >>
> >>> if the application does not make the extra calls it is not sufficient
> >>> because the code will still be present.
> >>>
> >> What you are missing: GCC emits calls to newlib.
> >>
> > Yes, I forgot to mention this. There are some calls to open, close, etc.
> >
> >
> >>> Now, we stumbled with the newlib source code that is very intertwined
> >>>
> >> with
> >>
> >>> RTEMS (mainly to make malloc reentrant, from what I can tell). This
> will
> >>> need some detailed research to make sure everything works well.
> >>>
> >> Good luck - To me your plan is nothing but silly.
> >>
> >>
> >
> >
> >
> >
> 
> 
> --
> Thanks&  Best Regards
> 
> ---Ray





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