Python C绑定错误 [英] Python C binding error

问题描述

我已经用C代码编写了Python API，并将文件另存为foo.c.

I have written a Python API in C code and saved the file as foo.c.

代码:

#include <Python.h>
#include <stdio.h>

static PyObject *foo_add(PyObject *self, PyObject *args)
{
    int a;
    int b;

    if (!PyArg_ParseTuple(args, "ii", &a, &b))
    {
        return NULL;
    }

    return Py_BuildValue("i", a + b);
}

static PyMethodDef foo_methods[] = {
    { "add", (PyCFunction)foo_add, METH_VARARGS, NULL },
    { NULL, NULL, 0, NULL }
};

PyMODINIT_FUNC initfoo()
{
    Py_InitModule3("foo", foo_methods, "My first extension module.");
}

当我尝试使用下面提到的命令进行编译时，出现编译错误.

When i try to compile using the below mentioned command i am getting compilation error.

命令:gcc -shared -I/usr/include/python2.7 foo.c -o foo.so

Command: gcc -shared -I/usr/include/python2.7 foo.c -o foo.so

错误: gcc -shared -I/usr/include/python2.7 foo.c -o foo.so /usr/bin/ld:/tmp/ccd6XiZp.o:在创建共享库时，无法使用针对".rodata"的重定位R_X86_64_32；用-fPIC重新编译 /tmp/ccd6XiZp.o:添加符号时出错:值错误 collect2:错误:ld返回1退出状态

Error: gcc -shared -I/usr/include/python2.7 foo.c -o foo.so /usr/bin/ld: /tmp/ccd6XiZp.o: relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC /tmp/ccd6XiZp.o: error adding symbols: Bad value collect2: error: ld returned 1 exit status

如果我使用"-c"选项给出编译命令，则编译命令将成功编译并创建目标文件foo.so(这是可执行文件).

If i give compilation command with "-c" option, its getting compiled successfully and created the object file foo.so (This is the executable file).

我必须创建一个目标文件(不使用编译命令中的-c选项)并将其导入Python Shell进行验证.

I have to create a object file (without using -c option in compilation command) and import them in Python shell to verify it.

请让我知道我在做什么错了.

Please let me know what am i doing wrong here.

推荐答案

在编译标志中，应包括-fPIC以编译为与位置无关的代码.这是动态链接库所必需的.

In your compilation flags you should include -fPIC to compile as position independent code. This is required for dynamically linked libraries.

例如

gcc -c -fPIC foo.c -o foo.o
gcc -shared foo.o -o foo

或一步一步

gcc -shared -fPIC foo.c -o foo.so

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