Re: [Paparazzi-devel] FlightGear not working

[Eric Parsonage]

Eduard

I am surprised you find this does not work.

The structure packing would naturally be pack(8) when built on linux with a 64 
bit compiler. ie you dont need to tell it to do any special alignment because 
it will be aligned on 8 byte boundaries anyway otherwise integers (which take 8 
bytes in 64bit)  would not be aligned in memory.

Eric 



On 07/12/2011, at 1:05 AM, Eduard Iten wrote:

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> Am 06.12.2011 14:35, schrieb Eric Parsonage:
>> Eduard
>> 
>> I pushed a change that should fix this problem on 64 bit linux.
>> 
>> It would be great if you could test it for me on 64 bit linux. I
>> have already tested it on OSX
> Hi Eric,
> 
> no, it doe's not work on 64bit Linux, I just tested it. It works with
> paparazzi on 64bit linux and fgfs in a 32bit virtual machine.
> I think this problem is not so easy to resolve, at least not if you
> got a multi computer setup. Look at the lines here, also in your change:
> 
> index b5515c8..0faf811 100644
> - --- a/sw/simulator/flight_gear.h
> +++ b/sw/simulator/flight_gear.h
> @@ -211,7 +211,9 @@ struct FGNetMiniFDM {
> #define FG_NET_GUI_VERSION 7
> #define FG_NET_GUI_MAX_TANKS 4
> 
> - -#ifdef __x86_64__
> +// FIXME: Flightgear on OSX is still 32 bit get rid
> +// off these pragmas when it goes to 64 bit.
> +#ifdef __x86_64__ && __APPLE__
> #pragma pack(push)
> #pragma pack(4)
> #endif
> @@ -249,7 +251,7 @@ struct FGNetGUI {
>   float course_deviation_deg; // degrees off target course
>   float gs_deviation_deg;     // degrees off target glide slope
> };
> - -#ifdef __x86_64__
> +#ifdef __x86_64__ && __APPLE__
> #pragma pack(push)
> #pragma pack(pop)
> #endif
> 
> For me on 64bit oneiric with both paparazzi and fgfs being 64bit, the
> pack(4) have to be pack(8) to work (of course, you also have to drop
> the __APPLE__ part.
> 
> Regards, Edi
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