Ceph

I followed README.md to build Ceph and run vstart, aiming to run s3-tests with RGW for now. Result is, vstart loops, emitting the following:

/home/zaitcev/ceph/ceph-srbac/build/bin/ceph-mds -i c -c /home/zaitcev/ceph/ceph-srbac/build/ceph.conf
starting mds.c at
  /home/zaitcev/ceph/ceph-srbac/build/bin/ceph -c /home/zaitcev/ceph/ceph-srbac/build/ceph.conf -k /home/zaitcev/ceph/ceph-srbac/build/keyring fs volume ls
  Error EINVAL: SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats

/home/zaitcev/ceph/ceph-srbac/build/bin/ceph -c /home/zaitcev/ceph/ceph-srbac/build/ceph.conf -k /home/zaitcev/ceph/ceph-srbac/build/keyring fs volume ls
  Error EINVAL: SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats

<------ loops here forever, with the empty line

Command history:

[zaitcev@lembas ceph-srbac]$ history | tail -40
   341  vi src/mgr/ActivePyModule.h
   342  cd build/
   343  ninja
   344  RGW=1 ../src/vstart.sh -n --without-dashboard
   345  ../src/stop.sh

Source is branch master on 2021-11-20.

The build platform is Fedora 35, Python 3.10.

The documentation for Python says:
at https://docs.python.org/3/c-api/intro.html
"It is recommended to always define PY_SSIZE_T_CLEAN before including Python.h."

However, as you can see, we cannot avoid including it anymore.

The code generated by Cython always defines it. For example, in
build/src/pybind/rgw/rgw.c:

/* Generated by Cython 0.29.24 /
  #ifndef PY_SSIZE_T_CLEAN
  #define PY_SSIZE_T_CLEAN
  #endif / PY_SSIZE_T_CLEAN */
  #include "Python.h"

Therefore, it is my opinion that we ought to define the macro always.