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question about library?


I used newlib-1.10.0 to compile a library for Motorola M.Core2107 mcu. I had compiled successly. when I debugged these functions, I found many functions not to used. Question is follow(for example): 
1. /cygdrive/e/cygwin/usr/local/mcore/mcore-elf/lib/big/libg.a(exit.o): 
In function `exit': 
exit.o(.text+0x48): undefined reference to `_exit' 
2. /cygdrive/e/cygwin/usr/local/mcore/mcore-elf/lib/big/libm.a(w_asin.o): 
In function `asin': 
w_asin.o(.text+0xb0): undefined reference to `__errno' 
3. IO functions can't to use. For example: 
¡¡ printf, scanf...... 
fopen,fclose.... 
4. These functions can't also to use. Include: 
malloc,calloc,realloc,free. 

How can I compile new library for M.CORE2107? Do I need to amend source codes? Please give me some advices and method. thanks...
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