Cvpcb calculates number of pins wrong

[Ryan]

I am using a 74HC14 part (a simple and VERY common 14-pin logic gate).
This happens to be a hex schmitt-trigger-input inverter gate array.
I am only using 4 of the 6 logic gates from this chip. I am also using the GND and VCC pins (pins 7 and 14 respectively).
There are only 4 logic gates on my schematic.
The total number of pins I am USING is 10.
When I run Cvpcb, it thinks that a 74HC14 is a 10-pin part, but that is wrong.
A 74HC14 is a 14-pin part.
When I place two extra inverters from my 74hc14, Cvpcb then thinks that this is a 14-pin (which is correct).

My problem is this: Cvpcb should think my 74HC14 is a 14-pin ALWAYS.
It shouldn't DECIDE how many pins it has based on how many gates I place on my schematic.
Even if you are only using 1 of the 6 gates in the part, you still have to place the entire part.

***

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[Gaurav Juvekar (gauravjuvekar)]

Confirmed on nightly

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[Wayne Stambaugh (stambaughw)]

There are two issues at play here. One is the CvPcb code. The other is user related.

The first issue is that CvPcb uses the number of net connections to determine the pin count filtering which is technically incorrect and is causing this issue. This will not be trivial to fix. The current CvPcb netlist code does not use the symbol libraries in any way so it would require adding access to the symbol libraries to get the actual pin count of the symbol which would resolve this issue.

The second issue is that you should never leave unused gate inputs floating. This is a really bad design practice and is most likely why the KiCad devs missed this because they would have added all of the unused gates the the schematic and tied the unused inputs either high or low. This would result the correct net connection count.

[Jeff Young (jeyjey)]

We need to move CvPcb to a Kiway-transmitted SCH_REFERENCE_LIST. (We can then also fix the issue of assigning a footprint to a symbol on a duplicated sub-sheet should update all instances of that sub-sheet.)

[Jeff Young (jeyjey)]

The pins turn out to be in the netlist, so for now count them instead of using the netlist count as a proxy.

[KiCad Janitor (kicad-janitor)]

Fixed in revision 778a3a4777f9a2de4b7edfc85e3fc910eb4987fd
https://git.launchpad.net/kicad/patch/?id=778a3a4777f9a2de4b7edfc85e3fc910eb4987fd