newlib _REENT_SMALL

[Jeff Johnston]

fpaolo63 wrote:
> Hi all,
> I'm new on newlib.
>
> I just made running my lpc23xx GNU tools chain on UBUNTU.
> binutil 2.17, GCC 4.2.1, newlib 1.15, gdb 6.6
>
> I wrote my own syslib, and I run a rtos application.
> Now, I'd to reduce the memory footprint of the REENT support.
>
> I have rebuilt the newlib setting _REENT_SMALL
> (newlib_cflags="-DSMALL_MEMORY -D_REENT_SMALL").
> Application is working fine but "struct _reent"  on my application  is
> again ~1k.
>
If you are always going to use _REENT_SMALL, then do it in 
libc/include/sys/config.h.
This means that nothing will accidentally get built without the flag on 
and this
files gets included whenever a user includes a newlib header file (i.e. 
application and
newlib are consistent).

If you just want to try it out, specify --enable-newlib-reent-small when 
you configure newlib.
This will set _REENT_SMALL in libc/include/sys/config.h for you.

-- Jeff J.