Re: help...

[Christopher Faylor <cgf-cygwig@cygwin.com>]

On Wed, Jan 08, 2003 at 11:23:28AM +0800, top_general wrote:
>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?

You can't.

>who help me ? Thanks

It's unlikely that anyone can.  You cannot just drop code into cygwin
without understanding what is going on.  If you are having problems with
printf you should report them.  If you want to augment printf to use
something available only in uClibc (a very nice embedded libc) then you
should look at the existing code for printf in newlib and modify that.
Trying to retrofit printf from uClibc for cygwin would be a daunting
task.

Wouldn't it be nice if the world worked that way, though?  No
understanding required.

"I'm trying to modify my television so that it will take HDTV signals.
I've pried the back off and randomly moved my hand around inside and now
it seems to work.  I'm off to modify my VCR so that it will take DVDs
next.  I assume that all that I'll need to do is close up the hole in
the front with some cardboard and just add a slot for the DVD..."

cgf
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