newlib _REENT_SMALL

[fpaolo63]

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.

I recompile the application defining -D_REENT_SMALL on my makefile:
"struct _reent"is now ~100B, my application is resetting.

Could someone give me infos / tricks.

Thanks
paolo