remove HAS_EVDNS and check for EVENTDNS_H

gevent/core.pyx

@@ -375,7 +375,6 @@ def get_method():
 
 cdef extern from *:
     cdef void emit_ifdef "#if defined(_EVENT_VERSION) //" ()
-    cdef void emit_evdns_ifdef "#if defined(EVENTDNS_H) //" ()
     cdef void emit_else  "#else //" ()
     cdef void emit_endif "#endif //" ()
 

gevent/evdns.pxi

@@ -54,17 +54,9 @@ DNS_IPv6_AAAA		= 3
 # Flags
 DNS_QUERY_NO_SEARCH	= 1
 
-emit_evdns_ifdef()
-HAS_EVDNS = 1
-emit_else()
-HAS_EVDNS = 0
-emit_endif()
-
 def dns_init():
-    emit_evdns_ifdef()
     """Initialize async DNS resolver."""
     evdns_init()
-    emit_endif()
 
 cdef void __evdns_callback(int result, char t, int count, int ttl,
                      void *addrs, void *arg) with gil:
@@ -102,11 +94,9 @@ def dns_resolve_ipv4(char *name, int flags, callback, *args):
     callback -- callback with (result, type, ttl, addrs, *args) prototype
     args     -- option callback arguments
     """
-    emit_evdns_ifdef()
     t = (callback, args)
     Py_INCREF(t)
     evdns_resolve_ipv4(name, flags, __evdns_callback, <void *>t)
-    emit_endif()
 
 def dns_resolve_ipv6(char *name, int flags, callback, *args):
     """Lookup an AAAA record for a given name.
@@ -118,11 +108,9 @@ def dns_resolve_ipv6(char *name, int flags, callback, *args):
     callback -- callback with (result, type, ttl, addrs, *args) prototype
     args     -- option callback arguments
     """
-    emit_evdns_ifdef()
     t = (callback, args)
     Py_INCREF(t)
     evdns_resolve_ipv6(name, flags, __evdns_callback, <void *>t)
-    emit_endif()
 
 def dns_resolve_reverse(char *ip, int flags, callback, *args):
     """Lookup a PTR record for a given IPv4 address.
@@ -134,13 +122,11 @@ def dns_resolve_reverse(char *ip, int flags, callback, *args):
     callback -- callback with (result, type, ttl, addrs, *args) prototype
     args     -- option callback arguments
     """
-    emit_evdns_ifdef()
     t = (callback, args)
     Py_INCREF(t)
     cdef in_addr addr
     inet_aton(ip, &addr)
     evdns_resolve_reverse(&addr, flags, __evdns_callback, <void *>t)
-    emit_endif()
 
 def dns_resolve_reverse_ipv6(char *ip, int flags, callback, *args):
     """Lookup a PTR record for a given IPv6 address.
@@ -152,16 +138,12 @@ def dns_resolve_reverse_ipv6(char *ip, int flags, callback, *args):
     callback -- callback with (result, type, ttl, addrs, *args) prototype
     args     -- option callback arguments
     """
-    emit_evdns_ifdef()
     t = (callback, args)
     Py_INCREF(t)
     cdef in6_addr addr
     inet_pton(AF_INET6, ip, &addr)
     evdns_resolve_reverse_ipv6(&addr, flags, __evdns_callback, <void *>t)
-    emit_endif()
 
 def dns_shutdown(int fail_requests=0):
     """Shutdown the async DNS resolver and terminate all active requests."""
-    emit_evdns_ifdef()
     evdns_shutdown(fail_requests)
-    emit_endif()