Fw: Cerate shared library problem on Cygwin!

["Cliff Tsai" <clifftsai@minecard.com.tw>]

 
Hi:
    
    I wanna create a simple shared library.I 
used following two method.
 
    1. use libtool:
        $libtool gcc -c 
hello.c  ->no any warning or error message
        $libtool gcc -rpath 
/usr/local/lib -o libhello.la hello.lo
        libtool: link: warning: 
undefined symbols not allowed in 
        i586-pc-cygwin 
shared library  -> is this OK?
 
     2. another method
        $gcc -fPIC -c 
hello.c
        cc1.exe: warning: -fPIC 
ignored for target(all code is position independent)
            
                
->Is this OK?
 
        $gcc -shared -o 
hello.so hello.o
        cannot export 
_bss_end__:symbol not defined.
         cannot 
export _bss_start__:symbol not defined.
        cannot export 
_data_end__:symbol not defined.
        cannot 
export _data_start__:symbol not defined.
        collect2: ld 
returned 1 exit status
        
                
    ->what do these mean,and how to solve the 
problem?
 
         I've reference the doc-"AUTOBOOK" in 
redhat website,but don't get any 
        answer,do 
any one know where to get more information about shared 
library
        and dynamic 
linker and loader?thanks!