使用ctypes错误“ ELF类错误”

python+ctypes+c99

./libfoo.so: wrong ELF class: ELFCLASS32

libfoo.so

gcc/ctypes

 File \"foo.py\", line 8, in <module>
    autofoo=cdll.LoadLibrary(\"./libfoo.so\")
  File \"/usr/lib/python2.6/ctypes/__init__.py\", line 431, in LoadLibrary
    return self._dlltype(name)
  File \"/usr/lib/python2.6/ctypes/__init__.py\", line 353, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: ./libfoo.so: wrong ELF class: ELFCLASS32

gcc -c  -std=c99 -lm -D_GNU_SOURCE -Wall -pedantic -fopenmp -ofoo.o foo.c

libfoo.so

gcc -c -fPIC -m64 -std=c99 -lm -D_GNU_SOURCE -Wall -pedantic -fopenmp -o foo.o foo.c
gcc -m64 -shared -Wl,-soname,libfoo.so -o libfoo.so foo.o