Need to make customized newlib

[Rick Mann]

Hi. I need to start working on making a pared-down version of newlib.  
I've got a build of binutils/GCC/newlib that work for our Xscale  
target, but FAA regs require that we actually strip from all source  
code any unused functions. So, I was hoping I could just build a  
separate newlib, and link our application against that, in lieu of the  
newlib that exists with the GCC installation.

Is this possible? I tried building newlib with ./configure -- 
target=xscale-elf, and then I built a test program that includes  
<stdio.h> and links against printf. Then I found the printf.c and  
commented out the implementation, and rebuilt, hoping that I'd get a  
link error with my test program now. But I don't.

How can I ensure that I'm linking against my second newlib? Is it even  
possible?

Does anyone have any other suggestions on how to approach this?

TIA,
-- 
Rick