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Re: [Paparazzi-devel] FlightGear not working

From: Eric Parsonage
Subject: Re: [Paparazzi-devel] FlightGear not working
Date: Tue, 6 Dec 2011 21:02:47 +1030

Hi Felix, Andreas

I put the alignment pragma in the code for OSX which is 64 bit. But the 
official flightgear distribution for OSX is 32 bit. I needed to force the 
structure to be aligned correctly for the 32 bit flight gear to be able to 
decode the structure correctly.

Now you guys are moving to 64 bit linux and have flightgear built 64 bit then 
the pragma needs putting inside some ifdefs  that check for the operating 
system being OSX. Hopefully eventually flightgear will be built 64 bit for osx.


On 06/12/2011, at 8:57 PM, Andreas Gaeb wrote:

> Am 05.12.2011 18:51, schrieb Felix Ruess:
>> I have no problems on Ubuntu Oneiric (32bit) and with flightgear
>> package 2.0.0-4ubuntu1.
>> But use the native-gui option like Stephen pointed out, and like it's
>> documented on the wiki.
>> Maybe this is an issue on 64bit?
> Very likely, probably caused by different alignment of the members of
> the FGNetGui structure in sw/simulator/flight_gear.h. There is a #pragma
> pack(4) around the structure in Paparazzi, which is correct if you want
> to send to a 32bit FlightGear. For a 64bit FlightGear, you need to use
> #pragma pack(8), I suppose. Best of all would be to use #pragma pack(1)
> on both programs and any architecture, but that is only possible if you
> recompile FlightGear.
> Best regards,
>       Andreas
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