Python and Ruby bindings displayed an unhelpful error if trying to load an old incompatible fdb_c with a new binding.

bindings/python/fdb/__init__.py

@@ -81,6 +81,8 @@ def api_version(ver):
     elif err != 0:
         raise RuntimeError('FoundationDB API error')
 
+    fdb.impl.init_c_api()
+
     list = (
         'FDBError',
         'predicates',

bindings/python/fdb/impl.py

@@ -1285,6 +1285,7 @@ def optionalParamToBytes(v):
 
 _FDBBase.capi = _capi
 
+def init_c_api():
     _capi.fdb_select_api_version_impl.argtypes = [ctypes.c_int, ctypes.c_int]
     _capi.fdb_select_api_version_impl.restype = ctypes.c_int
 

bindings/ruby/lib/fdb.rb

@@ -70,6 +70,8 @@ module FDB
       raise "FoundationDB API version error"
     end
 
+    FDBC.init_c_api()
+
     require_relative 'fdbtuple'
     require_relative 'fdbdirectory'
 

bindings/ruby/lib/fdbimpl.rb

@@ -64,6 +64,10 @@ module FDB
     typedef :int, :fdb_error
     typedef :int, :fdb_bool
 
+    attach_function :fdb_select_api_version_impl, [ :int, :int ], :fdb_error
+    attach_function :fdb_get_max_api_version, [ ], :int
+
+    def self.init_c_api
       attach_function :fdb_get_error, [ :fdb_error ], :string
 
       attach_function :fdb_network_set_option, [ :int, :pointer, :int ], :fdb_error
@@ -113,9 +117,7 @@ module FDB
       attach_function :fdb_transaction_get_versionstamp, [ :pointer ], :pointer
       attach_function :fdb_transaction_on_error, [ :pointer, :fdb_error ], :pointer
       attach_function :fdb_transaction_reset, [ :pointer ], :void
-
-    attach_function :fdb_select_api_version_impl, [ :int, :int ], :fdb_error
-    attach_function :fdb_get_max_api_version, [ ], :int
+    end
 
     class KeyValueStruct < FFI::Struct
       pack 4