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I have a question . 
Firstly: 
I make a "C library".The "C library" source code is below: 
http://www.uclinux.org/pub/uClinux/libraries/ 
uC-libc-310899.tar.gz. 
I build a "libc.a" using "make " in cygwin. 

secondly: 
I do an example "a.c".below: 
//a.c 
#include <stdio.h> 
void main() 
{ 
printf("success!"); 
return ; 
} 

I want to use "printf" function in libc.a, not in libcygwin.a. 
so I using a new libcygwin.a ,not original libcygwin.a. 

ar r libcygwin.a _cygwin_crt0_common.o _cygwin_S_IEXEC.o cygwin_attach_dll.o cygwin_crt0.o dll_entry.o dll_main.o libcmain.o premain0.o premain1.o premain2.o premain3.o regcomp.o regerror.o regexec.o regfree.o 

thirdly: 
complied the program: 
gcc -g -o a.exe a.c -lc -lcygwin 

there are some question below: 
/cygdrive/d/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ccSmKP9B.o: In function `main': 
/cygdrive/e/develop/uc-libc_310899/1.c:4: undefined reference to `__main' 
/cygdrive/e/develop/uc-libc_310899/1.c:5: undefined reference to `printf' 
/usr/lib/libcygwin.a(cygwin_crt0.o)(.text+0x41): undefined reference to `import stub 
for dll_crt0(per_process *)' 
/usr/lib/libcygwin.a(_cygwin_crt0_common.o)(.text+0xca): undefined reference to `malloc' 
/usr/lib/libcygwin.a(d000582.o)(.idata$7+0x0): undefined reference to `_head_cygwin1_dll' 
/usr/lib/libcygwin.a(d001007.o)(.idata$7+0x0): undefined reference to `_head_cygwin1_dll' 
/usr/lib/libcygwin.a(d000723.o)(.idata$7+0x0): undefined reference to `_head_cygwin1_dll' 
/usr/lib/libcygwin.a(d000635.o)(.idata$7+0x0): undefined reference to `_head_cygwin1_dll' 
collect2: ld returned 1 exit status 

how can i do? who help me ? Thanks
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