Comment 4 for bug 1821436

Hello

There is an similar issue with power symbols/flags
If i connect +5V, PWR_FLAG and GNDREF direct, as an example, and i run an ERC with default settings, i get NO Error, but i should.
This is done with the default settings of the ERC Matrix.
Of course, if i put a power flag to the different voltages separatly, i get an error message if i connect #5V and GNDREF direct. (Not at the point where the error happens, but somewhere at the declaration, which is also nasty)

But somehow there should be a check that there is only one label bound to a net. In my opinion it is not good to name a net with different labels. If i want to tie different labels, as an example analog ground and digital ground, it should be done with a sort of "net tie". (But this will rise another issues with copper in footprints and DRC at PCBnew) So at least a warning should be thrown.

It happens for me with an older version of KiCad: 5.0.2+dfsg1-1, release build, (details further below) but some discussions show me, that the problem will exist in newer versions also.

Link to this discussion (german, sorry):
https://www.mikrocontroller.net/topic/484055#new

At the attachmend you fill find a zip file called "KiCad_ERC-Error_14Nov2019.zip" with a KiCad Projekt "Test1" which contains the bad schematic, a picture "Picture_BadSchematic_Test1_14Nov2019.png" with the bad schematic and a picture "Picture_ERC-Defaults_Test1_14Nov2019.png" of the dafault ERC matrix.

And now the version in detail:

Application: kicad
Version: 5.0.2+dfsg1-1, release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.64.0 OpenSSL/1.1.1d zlib/1.2.11 libidn2/2.0.5 libpsl/0.20.2 (+libidn2/2.0.5) libssh2/1.8.0 nghttp2/1.36.0 librtmp/2.3
Platform: Linux 4.19.0-6-686-pae i686, 32 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.67.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.62.0
    Compiler: GCC 8.2.0 with C++ ABI 1013

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

With best regards: Bernd Wiebus alias dl1eic