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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 CENTOS

load

LOAD(7) 						  PostgreSQL 9.2.7 Documentation						   LOAD(7)

NAME

       LOAD - load a shared library file

SYNOPSIS

       LOAD 'filename'

DESCRIPTION

       This command loads a shared library file into the PostgreSQL server's address space. If the file has been loaded already, the command does
       nothing. Shared library files that contain C functions are automatically loaded whenever one of their functions is called. Therefore, an
       explicit LOAD is usually only needed to load a library that modifies the server's behavior through "hooks" rather than providing a set of
       functions.

       The file name is specified in the same way as for shared library names in CREATE FUNCTION (CREATE_FUNCTION(7)); in particular, one can rely
       on a search path and automatic addition of the system's standard shared library file name extension. See Section 35.9, "C-Language
       Functions", in the documentation for more information on this topic.

       Non-superusers can only apply LOAD to library files located in $libdir/plugins/ -- the specified filename must begin with exactly that
       string. (It is the database administrator's responsibility to ensure that only "safe" libraries are installed there.)

COMPATIBILITY

       LOAD is a PostgreSQL extension.

SEE ALSO

       CREATE FUNCTION (CREATE_FUNCTION(7))

PostgreSQL 9.2.7						    2014-02-17								   LOAD(7)