psycopg2 extension fails to compile with clang

Submitted by: Bradley Saulteaux

building 'psycopg2._psycopg' extension

clang -march=corei7-avx -O3 -ffast-math -fPIC -Wimplicit -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.4.5 (dt dec pq3 ext)" -DPG_VERSION_HEX=0x090200 -DPSYCOPG_EXTENSIONS=1 -DPSYCOPG_NEW_BOOLEAN=1 -DHAVE_PQFREEMEM=1 -I/usr/local/include/pypy1.9 -I. -I/usr/local/include -I/usr/local/include/postgresql/server -c psycopg/psycopgmodule.c -o build/temp.freebsd-9.0-RELEASE-amd64-2.7/psycopg/psycopgmodule.o

In file included from psycopg/psycopgmodule.c:27:

In file included from ./psycopg/psycopg.h:33:

./psycopg/config.h:146:15: error: static declaration of 'round' follows non-static declaration

static double round(double num)

          ^

/usr/include/math.h:273:8: note: previous declaration is here

double round(double);

    ^

psycopg/psycopgmodule.c:544:37: warning: incompatible pointer types passing 'PyTypeObject ' (aka 'struct _typeobject ') to parameter of type 'PyObject ' (aka 'struct _object ') [-Wincompatible-pointer-types]

if (!(descr = PyDescr_NewMethod((PyTypeObject *)Error,

                                ^~~~~~~~~~~~~~~~~~~~~

/usr/local/include/pypy1.9/pypy_decl.h:70:52: note: passing argument to parameter 'arg0' here

PyAPI_FUNC(PyObject ) PyDescr_NewMethod(PyObject arg0, PyMethodDef *arg1);

                                               ^

1 warning and 1 error generated.

error: command 'clang' failed with exit status 1