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Date: Thu, 7 Jan 2016 05:09:04 +0100 (CET)
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To: "Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] Re: some more geometry module tweaks (nm maximum
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On Wed, 6 Jan 2016, Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user@=
delorie.com] wrote:

>On my old system the default build still seems to be 32 bit long int.=C2=
=A0 I
>guess things like the zoom bug Igor mentioned are due to most devels being
>on 64 now.
>Britton

Just tried pcb-rnd on a 64 bit box, with a 2.5x2.5 meter board.

I can confirm that the behaviour is different, but I can't confirm it's=20
working. I think you are right that some of the bugs are gone on 64=20
bits so I can zoom and pan, but with the gtk hid the crosshair simply=20
overflows (and jumps back to 0) at 2.1 meter.

Btw, I am not against setting hard limits on board size, even as a=20
permanent solution (given the limits are large enough). E.g. if it turns=20
out you have just enough bits with double or long long int or whatever=20
type to represent a board of ~10x10 meters, but things would get very=20
complicated above, I'd just limit the board size to 10x10.

I'd probably provide a disabled-by-default option for using long doubles=20
and/or gcc's builtin 128 bit ints (should work on x86_64). I think it'd be=
=20
a good compromise to say that pcb is portable up to that specific board=20
size limit and if someone wants a larger board, he needs to use a 64 bit=20
system with gcc (or a compiler that supports long doubles).

On the other hand, I think I will have an attempt with fixed point=20
integers in my projects. Already did some research and it doesn't look as=
=20
impossible as I thought.
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