Add accesible version numbers for C++ libcapnp

capnp/includes/capnp_cpp.pxd

@@ -12,6 +12,12 @@ cdef extern from "capnp/common.h" namespace " ::capnp":
     enum Void:
         VOID " ::capnp::VOID"
 
+cdef extern from "capnp/common.h":
+    int CAPNP_VERSION_MAJOR
+    int CAPNP_VERSION_MINOR
+    int CAPNP_VERSION_MICRO
+    int CAPNP_VERSION
+
 cdef extern from "kj/string.h" namespace " ::kj":
     cdef cppclass StringPtr:
         StringPtr()

capnp/lib/capnp.pyx

@@ -26,6 +26,11 @@ import threading as _threading
 import socket as _socket
 import random as _random
 
+_CAPNP_VERSION_MAJOR = capnp.CAPNP_VERSION_MAJOR
+_CAPNP_VERSION_MINOR = capnp.CAPNP_VERSION_MINOR
+_CAPNP_VERSION_MICRO = capnp.CAPNP_VERSION_MICRO
+_CAPNP_VERSION = capnp.CAPNP_VERSION
+
 # By making it public, we'll be able to call it from capabilityHelper.h
 cdef public object wrap_dynamic_struct_reader(Response & r):
     return _Response()._init_childptr(new Response(moveResponse(r)), None)

setup.py

@@ -25,6 +25,11 @@ def write_version_py(filename=None):
     cnt = """\
 version = '%s'
 short_version = '%s'
+
+from .lib.capnp import _CAPNP_VERSION_MAJOR as LIBCAPNP_VERSION_MAJOR
+from .lib.capnp import _CAPNP_VERSION_MINOR as LIBCAPNP_VERSION_MINOR
+from .lib.capnp import _CAPNP_VERSION_MICRO as LIBCAPNP_VERSION_MICRO
+from .lib.capnp import _CAPNP_VERSION as LIBCAPNP_VERSION
 """
     if not filename:
         filename = os.path.join(