Multiple warnings during pip install

[Zulan]

Most of the warnings seem harmless, but the incompatible pointer types worry me. On first sight it seems to work for me though.

Python 3.4.1 (default, May 19 2014, 17:23:49) 

gcc version 4.9.1 20140903 (prerelease) (GCC) 

pip install mysqlclient
Downloading/unpacking mysqlclient
  Downloading mysqlclient-1.3.3.tar.gz (77kB): 77kB downloaded
  Running setup.py (path:/home/zulan/code/django/build/mysqlclient/setup.py) egg_info for package mysqlclient

Installing collected packages: mysqlclient
  Running setup.py install for mysqlclient
    building '_mysql' extension
    gcc -pthread -Wno-unused-result -Werror=declaration-after-statement -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong --param=ssp-buffer-size=4 -fPIC -Dversion_info=(1,3,3,'final',1) -D__version__=1.3.3 -I/usr/include/mysql -I/usr/include/python3.4m -c _mysql.c -o build/temp.linux-x86_64-3.4/_mysql.o -fPIC -pipe -fstack-protector-strong --param=ssp-buffer-size=4 -fno-strict-aliasing -DBIG_JOINS=1 -fomit-frame-pointer -fno-delete-null-pointer-checks -g -static-libgcc -fno-omit-frame-pointer -fno-strict-aliasing
    In file included from _mysql.c:40:0:
    /usr/include/mysql/my_config.h:437:0: warning: "HAVE_MBRTOWC" redefined
     #define HAVE_MBRTOWC
     ^
    In file included from /usr/include/python3.4m/Python.h:8:0,
                     from _mysql.c:29:
    /usr/include/python3.4m/pyconfig.h:554:0: note: this is the location of the previous definition
     #define HAVE_MBRTOWC 1
     ^
    In file included from _mysql.c:40:0:
    /usr/include/mysql/my_config.h:438:0: warning: "HAVE_WCSCOLL" redefined
     #define HAVE_WCSCOLL
     ^
    In file included from /usr/include/python3.4m/Python.h:8:0,
                     from _mysql.c:29:
    /usr/include/python3.4m/pyconfig.h:1132:0: note: this is the location of the previous definition
     #define HAVE_WCSCOLL 1
     ^
    _mysql.c: In function ‘_mysql_field_to_python’:
    _mysql.c:1370:16: warning: unused variable ‘fmt’ [-Wunused-variable]
        const char *fmt = "s#";
                    ^
    _mysql.c: In function ‘_mysql_ConnectionObject_query’:
    _mysql.c:1976:9: warning: unused variable ‘mysql’ [-Wunused-variable]
      MYSQL *mysql = &(self->connection);
             ^
    _mysql.c: In function ‘_mysql_ConnectionObject_read_query_result’:
    _mysql.c:2021:6: warning: unused variable ‘len’ [-Wunused-variable]
      int len, r;
          ^
    _mysql.c:2020:8: warning: unused variable ‘query’ [-Wunused-variable]
      char *query;
            ^
    _mysql.c: In function ‘_mysql_ConnectionObject_getattro’:
    _mysql.c:2665:33: warning: passing argument 1 of ‘PyObject_GenericGetAttr’ from incompatible pointer type
      return PyObject_GenericGetAttr(self, name);
                                     ^
    In file included from /usr/include/python3.4m/pytime.h:6:0,
                     from /usr/include/python3.4m/Python.h:65,
                     from _mysql.c:29:
    /usr/include/python3.4m/object.h:533:24: note: expected ‘struct PyObject *’ but argument is of type ‘struct _mysql_ConnectionObject *’
     PyAPI_FUNC(PyObject *) PyObject_GenericGetAttr(PyObject *, PyObject *);
                            ^
    _mysql.c: In function ‘_mysql_ConnectionObject_setattro’:
    _mysql.c:2679:33: warning: passing argument 1 of ‘PyObject_GenericSetAttr’ from incompatible pointer type
      return PyObject_GenericSetAttr(self, name, v);
                                     ^
    In file included from /usr/include/python3.4m/pytime.h:6:0,
                     from /usr/include/python3.4m/Python.h:65,
                     from _mysql.c:29:
    /usr/include/python3.4m/object.h:534:17: note: expected ‘struct PyObject *’ but argument is of type ‘struct _mysql_ConnectionObject *’
     PyAPI_FUNC(int) PyObject_GenericSetAttr(PyObject *,
                     ^
    _mysql.c: In function ‘_mysql_ResultObject_setattro’:
    _mysql.c:2693:33: warning: passing argument 1 of ‘PyObject_GenericSetAttr’ from incompatible pointer type
      return PyObject_GenericSetAttr(self, name, v);
                                     ^
    In file included from /usr/include/python3.4m/pytime.h:6:0,
                     from /usr/include/python3.4m/Python.h:65,
                     from _mysql.c:29:
    /usr/include/python3.4m/object.h:534:17: note: expected ‘struct PyObject *’ but argument is of type ‘struct _mysql_ResultObject *’
     PyAPI_FUNC(int) PyObject_GenericSetAttr(PyObject *,
                     ^
    gcc -pthread -shared -Wl,-O1,--sort-common,--as-needed,-z,relro build/temp.linux-x86_64-3.4/_mysql.o -L/usr/lib -L/usr/lib -lmysqlclient_r -lpthread -lz -lm -lssl -lcrypto -ldl -lpython3.4m -o build/lib.linux-x86_64-3.4/_mysql.cpython-34m.so

Successfully installed mysqlclient
Cleaning up...