swig编译python-c++接口,gcc出错const char*不能转char*

cdsfiui

我定义了一个普通函数，.h/.cpp/.i文件，用于给python调用，如下:
$cat example.h

1. #pragma once
   
2. int fact(int n);

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cat example.cpp

1. #include "example.h"
   
2. int fact(int n) {
   
3.   if (n < 0){ /* This should probably return an error, but this is simpler */
   
4.     return 0;
   
5.   }
   
6.   if (n == 0) {
   
7.     return 1;
   
8.   }
   
9.   else {
   
10.      /* testing for overflow would be a good idea here */
    
11.     return n * fact(n-1);
    
12.   }
    
13. }

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$cat example.i

1. %module example
   
2. 
   
3. %{
   
4. #define SWIG_FILE_WITH_INIT
   
5. #include "example.h"
   
6. %}
   
7. 
   
8. int fact(int n);

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python的DistUtil用到的文件如下
$cat setup.cpp.py

1. """
   
2. setup.py
   
3. """
   
4. 
   
5. from distutils.core import setup, Extension
   
6. 
   
7. 
   
8. example_module = Extension('_example',
   
9.                            sources=['example_wrap.cxx', 'example.cpp'],
   
10.                            )
    
11. 
    
12. setup (name = 'example',
    
13.        version = '0.1',
    
14.        author      = "SWIG Docs",
    
15.        description = """Simple swig example from docs""",
    
16.        ext_modules = [example_module],
    
17.        py_modules = ["example"],
    
18.        )

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然后用python的swig工具去编译

1. $swig -c++ -python example.i
   
2. $python setup.cpp.py build_ext --inplace
   
3. running build_ext
   
4. building '_example' extension
   
5. gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/local/include/python2.7 -c example_wrap.cxx -o build/temp.linux-x86_64-2.7/example_wrap.o
   
6. cc1plus: warning: command line option "-Wstrict-prototypes" is valid for Ada/C/ObjC but not for C++
   
7. In file included from example_wrap.cxx:2554:
   
8. example.h:5:20: warning: no newline at end of file
   
9. example_wrap.cxx: In function ‘int SWIG_Python_ConvertFunctionPtr(PyObject*, void**, swig_type_info*)’:
   
10. example_wrap.cxx:2051: error: invalid conversion from ‘const char*’ to ‘char*’
    
11. example_wrap.cxx: In function ‘void SWIG_Python_FixMethods(PyMethodDef*, swig_const_info*, swig_type_info**, swig_type_info**)’:
    
12. example_wrap.cxx:3200: error: invalid conversion from ‘const char*’ to ‘char*’
    
13. error: command 'gcc' failed with exit status 1

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上面这个编译错误似乎是来自于swig工具生成的代码。我想swig工具本身应该没有什么问题吧，是不是我的代码或者我执行的命令缺少了什么参数之类的?

该如何修改?