Mail Archives: geda-user/2017/06/05/05:31:39
gedau AT igor2 DOT repo DOT hu wrote:
> Hi PCB developers,
>
> during the subcircuit rework, I figured the concept of how the
> original code (and mainline) handles buffer layers is broken.
>
> The root of the problem is that buffers are sort of independent of the
> board being edited, while they do assume the layer stack is the same
> in buffers and in the board but nothing guarantees that. This causes
> no problem most of the time, but breaks as soon as:
>
> - the buffer is used to copy some data from one board to another, with
> a different layer stack
>
> - a board with different layer stack is loaded into the buffer
>
> - the layer stack of the current board is modified while a buffer is
> not empty
>
> The result is pasting objects on random layers - I could easily make
> copper turn into silk or change from top layer to bottom layer.
>
> After spending many hours on getting this fixed in pcb-rnd I think I
> have a full understanding of the problem now. If any of the PCB
> developers are interested in the details (why exactly it breaks, how
> to produce test cases for the bug, options for a fix) please visit me
> on pcb-rnd's IRC channel[1] to have a discussion so then you can write
> a proper bugreport.
>
> (I'm not trying to type the whole thing here becuase it's long, would
> take a lot of time and I am not sure anyone is interested. The fix is
> non-trivial and one may say "it was good for the past ~2 decades so it
> should be good for another 2" and then typing a long description would
> be waste of time.)
>
> Regards,
>
> Igor2
>
> [1] server: repo.hu; port: 6667; channel: #pcb-rnd
>
>
Hi Igor2,
I'm interested and in listening mode on #geda (or #pcb) on OFTC.
Kind regards,
Bert Timmerman.
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