Ignore unconnected pins option in ERC.

[Nick Wimpney]

I was trying to do some ERC on a partially completed schematic, and got hundreds of "No-connection" warnings. As I am not yet done the schematic, I figured I'd just turn those off so I could see if everything else is okay.

After turning all of the warnings off in the ERC options (all buttons on bottom row clicked to green), I run ERC again, and still get warnings on every non-connected pin.

Screenshot is here:
https://forum.kicad.info/t/problem-with-erc-no-connections-in-nightly-build/10262

Application: kicad
Version: 5.0.0-rc2-dev-unknown-7098827~63~ubuntu17.10.1, release build
Libraries:
    wxWidgets 3.0.3
    libcurl/7.55.1 OpenSSL/1.0.2g zlib/1.2.11 libidn2/2.0.2 libpsl/0.18.0 (+libidn2/2.0.2) librtmp/2.3
Platform: Linux 4.13.0-32-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.3 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.62.0
    Curl: 7.55.1
    Compiler: GCC 7.2.0 with C++ ABI 1011

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_SPICE=ON

This bug also occurs in 4.0.6 according to bobc on the kicad.info forums (In the thread with the screenshot, linked above)

[Wayne Stambaugh (stambaughw)]

"No Connect" in the pin table means that the pin type is set to "No Connect" not that there is no connection to the pin itself. Your change to the pin table will allow you to connect two "No Connect" pins together without an error. My guess that you want an optional "Ignore unconnected pins" option which we currently do no support.

[KiCad Janitor (kicad-janitor)]

KiCad bug tracker has moved to Gitlab. This report is now available here: https://gitlab.com/kicad/code/kicad/-/issues/2123