error: expected ')' before numeric constant #define IPADDR_NONE ((u32_t)0xffffffffUL)

[MarkEvens]

ESP-IDF 4.0.1 with Arduino as components

suddenly i got above title error and don't understand why i am changing nothing in component files.

directory for this file is : $HOME/esp/esp-idf/components/lwip/lwip/src/include/lwip/ip4_addr.h:63:37

[turkysha]

You are missing ')' in that file ( in ip4_addr.h).

[MarkEvens]

@turkysha
#define IPADDR_NONE ((u32_t)0xffffffffUL)

this is the line 63 of ip4_addr.h what do you think that i have to change

[MarkEvens]

my problem solved by below issue
microsoft/azure-iot-developer-kit#169

[ameerhazo]

Hello @MarkEvens, I've stumbled upon the same error while trying to build an ESP-IDF component (coap) in my esp32 arduino/ESP-IDF mix project. Could you tell me how you resolved the issue? I'm asking this because the solution you linked is done on a different board. Thanks for the help.

[moefear85]

I face this too, although solved it by rearranging the order/locations of includes, since it appears different components are redefining the same symbols but in different ways. It might also be related to mixing C with C++ components. Usually this means extra code to safeguard has to be embedded.

Unfortunately although now I'm following the same steps as I usually do, it's still not working. Does anybody know the exact systematic way to resolve this? In this case I believe the conflict is between Arduino and LwIP, as each defines IPADDR_NONE differently. I checked the actual location where the error is being reported. Syntactically, everything is correct. This is expected, otherwise nothing would ever have compiled, such that the developers would have had to fix it even before releasing it.

I checked the link provided by @markevans, but they claim "will fix it soon". This was back in 2017. The problem still exists now.

[awaters-meltin]

In case anyone else encounters this - the fix for me was to include the Arduino header first:

#include <WiFiUdp.h> // before lwip RE: https://github.com/espressif/arduino-esp32/issues/4405
#include <lwip/sockets.h>

[Magnatto]

In case anyone else encounters this - the fix for me was to include the Arduino header first:

#include <WiFiUdp.h> // before lwip RE: https://github.com/espressif/arduino-esp32/issues/4405
#include <lwip/sockets.h>

Thanks! Worked for me