binary operators / C func getting "invalid ELF header"

Hi folks,

I need to do a complex bitwise operation on integers during a select
query such as:

    select acctname from users U where func(U.flags, 27) = 0;

The function in C is:

    result = (~A) & (A ^ B)

I didn't see any bitwise operations like AND and XOR in the postgres
doc -- if they're there, I apologize and would love a pointer to the
doc.

Otherwise, I've gone down the path of trying to write a C function to
do this... and am getting this error:

    db=> select not_a_and__a_xor_b(1,1);
    ERROR:  Load of file /home/michael/sql/funcs.so failed:
     ��t@��t@chael/sql/funcs.so: invalid ELF header

I'm compiling with the -fpic option for Linux (under gcc)

    cc -c -O2 -fpic -g -I. -I./include -I. -I./include  -c funcs.c -o
funcs.o
    /bin/rm -f funcs.so
    /usr/bin/ar cr funcs.so funcs.o

Can someone tell me the step(s) I'm missing or what to try next? I've
tested the C code - works fine (included below).

thanks,
--Michael


------------------------------------------------
//
// functions used within postgres
//

#include "postgres.h"            /* for char16, etc. */

int
not_a_and__a_xor_b(int A, int B)
{
    return (~A) & (A ^ B);
}

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