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load error while creating shared library

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Operating Systems Linux load error while creating shared library
# 1  
Old 01-16-2006
Network load error while creating shared library
Hi,

I am trying to create shared library. When i run the script to build the library i get these errors

ld: warning: option -o appears more than once, first setting taken
ld: fatal: file libgc.so.0: open failed: No such file or directory
ld: fatal: File processing errors. No output written to libgc.so.0.0
collect2: ld returned 1 exit status
./shared.sh: /sbin/ldconfig: not found
ln: cannot create libgc.so: File exists
demo.c: In function `main':
demo.c:5: warning: return type of `main' is not `int'
ld: fatal: library -lgc: not found
ld: fatal: File processing errors. No output written to demo-shared
collect2: ld returned 1 exit status
./shared.sh: ./demo-shared: not found

Please, explain me what is this warning.
Here, you can find the details of script
#!/bin/sh
gcc -fPIC -g -c libgc.c
gcc -g -shared -Wl,-soname,libgc.so.0 \
-o libgc.so.0.0 libgc.o -lc
/sbin/ldconfig -n .
ln -sf libgc.so.0 libgc.so
gcc -g -c demo.c -o demo.o
gcc -g -o demo-shared demo.o -L. -lgc
LD_LIBRARY_PATH="." ./demo-shared


Thanks in advance.
masg1
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LEARN ABOUT OSX

install_name_tool

INSTALL_NAME_TOOL(1)					      General Commands Manual					      INSTALL_NAME_TOOL(1)

NAME

       install_name_tool - change dynamic shared library install names

SYNOPSIS

       install_name_tool [-change old new ] ... [-rpath old new ] ... [-add_rpath new ] ... [-delete_rpath new ] ... [-id name] file

DESCRIPTION

       Install_name_tool  changes the dynamic shared library install names and or adds, changes or deletes the rpaths recorded in a Mach-O binary.
       For this tool to work when the install names or rpaths are larger the binary should be built with  the  ld(1)  -headerpad_max_install_names
       option.

       -change old new
	      Changes  the dependent shared library install name old to new in the specified Mach-O binary.  More than one of these options can be
	      specified.  If the Mach-O binary does not contain the old install name in a specified -change option the option is ignored.

       -id name
	      Changes the shared library identification name of a dynamic shared library to name.  If the Mach-O binary is not	a  dynamic  shared
	      library and the -id option is specified it is ignored.

       -rpath old new
	      Changes  the  rpath  path  name old to new in the specified Mach-O binary.  More than one of these options can be specified.  If the
	      Mach-O binary does not contain the old rpath path name in a specified -rpath it is an error.

       -add_rpath new
	      Adds the rpath path name new in the specified Mach-O binary.  More than one of these options can be specified.  If the Mach-O binary
	      already contains the new rpath path name specified in -add_rpath it is an error.

       -delete_rpath old
	      deletes  the  rpath  path  name old in the specified Mach-O binary.  More than one of these options can be specified.  If the Mach-O
	      binary does not contains the old rpath path name specified in -delete_rpath it is an error.

SEE ALSO

       ld(1)

Apple, Inc.							   March 4, 2009					      INSTALL_NAME_TOOL(1)