Conflicting declaration on variable INADDR_NONE

[tsctrl]

Board

ESP32 Dev Module

Device Description

DevkitC

Hardware Configuration

Version

v2.0.3

IDE Name

IDF Component, Arduino IDE

Operating System

Windows 10

Flash frequency

40MHz

PSRAM enabled

no

Upload speed

115200

Description

Build Failed. Conflicting declaration on variable INADDR_NONE

error: ambiguous overload for types 'IPAddress' and 'u32_t' components/lwip/lwip/src/include/lwip/inet.h

arduino-esp32/cores/esp32/IPAddress.h

Line 95 in 1a7962e

extern IPAddress INADDR_NONE;

https://github.com/espressif/esp-lwip/blob/76303df2386902e0d7873be4217f1d9d1b50f982/src/include/lwip/inet.h#L71

Sketch

-

Debug Message

-

Other Steps to Reproduce

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[SuGlider]

Duplicated #6760

@tsctrl
Please read #6760 and check if your issue is similar.
In general, this conflict depends on the order of file including.
It only happens when mixing IDF and Arduino, for which we can't help, given it goes beyond ESP32 Arduino Framework.

[tsctrl]

yup same issue, just different library. and my case official Arduino Ethernet library function to check if dns is working.
here github.com/arduino-libraries/Ethernet

not sure if the fix mention will fix this issue, closing this issue as per solution added in the referenced pr above.

[SuGlider]

Is the issue in this line?

https://github.com/arduino-libraries/Ethernet/blob/4e356a64b811199892c3d64648986cdb7985f632/src/Dns.cpp#L99