<URL: http://bugs.freeciv.org/Ticket/Display.html?id=35065 >
As of revision 12589 of trunk, the ai never builds harbours.
The reason for this is that the call to is_req_active() in
adjust_wants_for_reqs() returns false when called with "pimpr=harbour",
regardless of whether the requirements for building a harbour are satisfied
or not.
This is in turn caused by setting the fourth argument of is_req_active() to
NULL, which makes the call to is_terrain_in_range() in is_req_active() return
false. In other words, the check if the city borders on the ocean always
fails.
An easy fix is to supply pcity->tile instead of NULL as argument to
is_req_active(). This makes the ai build harbours in a sensible way and
(apparently) doesn't break anything in the ai's behaviour. But since I'm
pretty new to freeciv's code, I am not sure whether this is the "right"
solution. In any case, there's a (very trivial) patch attached.
Frank
--- aicity.c.orig 2007-02-02 10:43:04.000000000 +0100
+++ aicity.c 2007-02-02 10:43:49.000000000 +0100
@@ -647,7 +647,7 @@
requirement_vector_iterate(&pimpr->reqs, preq) {
const bool active = is_req_active(pplayer, pcity, pimpr,
- NULL, NULL, NULL, NULL, preq);
+ pcity->tile, NULL, NULL, NULL, preq);
if (preq->source.type == REQ_TECH && !active) {
/* Found a missing technology requirement for this improvement. */
tech_vector_append(&needed_techs, &preq->source.value.tech);
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