IPAddress.h defines variable INADDR_NONE

[pianistrevor]

The header file has a line:
const IPAddress INADDR_NONE(0,0,0,0);
Which means every file that includes this header will be assigned its own INADDR_NONE. Projects with limited static memory will encounter problems when this file is included in many .cpp files.

A suggested workaround (which I have confirmed works) would be to make IPAddress.h say extern const IPAddress INADDR_NONE; and define the actual variable in IPAddress.cpp as const IPAddress INADDR_NONE(0,0,0,0);

[per1234]

Thanks for your suggestion @pianistrevor!

There was a previous report of this arduino/Arduino#1007

It was considered resolved by doing just what you suggested in the arduino/ArduinoCore-API repository:
arduino/ArduinoCore-API@3dbd7d7

However, the "Arduino AVR Boards" core has not yet transitioned to using ArduinoCore-API(#329), so the issue persists in this core.

[pianistrevor]

Good to know, thank you! Will this be something this core does in the future, or should I plan to configure a different board? I’m currently using a CI framework that installs AVR...

edit: I looked at the PR, if the owner doesn’t make the changes I would happily consider doing my own version of this with appropriate changes