[Freeciv-Dev] (PR#10085) Game proceeds differently on different systems

["Marko Lindqvist" <marko.lindqvist@xxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=10085 >


  There's no much hope to really catch this one, but I wanted to open 
ticket just in case. Data collected should be saved somewhere in case it 
someday turns useful.

  Jason cannot reproduce #10061 while I can. We definitely have very 
different systems, but low-level differences are not supposed to affect 
how game proceeds. I have confirmed that year -3950 save games are 
identical.

  All this is probably quite harmless. Normal users don't care if game 
would run slightly differently on somebody else's machine. Also, problem 
can be cygwin (<->other systems) specific, meaning that developers 
(except me for now) are not losing bug reproducibility because of this.

  So far all my attempts _not_ to reproduce #10061 using freeciv built 
from late-Sep-11 - midday-Sep-12 sources have failed. Now I have 
downloaded cvs-Sep-11 snapshot from freeciv.org. This way I have known 
set of source & data files, with autogen.sh already run. I run 
./configure without any parameters (or sometimes with 
--enable-maintainer-mode, but this has no affect - save games up to 
assert in 1545 are identical).

  Unless it turns out that Jason can reproduce #10061 with above 
setting, I guess that only way to proceed with this (if we bother) is to 
compare more save games in order to find point where they start to 
differ. My first guess is that -375 saves are identical, -350 are not 
(auto saves are made in the beginning of turn, right? Otherwise I have 
off-by-turn error here)


  - Caz