Multiple definitions about asyncudp_wt32_eth01

[maxgerhardt]

Cross-posted to https://community.platformio.org/t/multiple-include/28287

[khoih-prog]

Hi @wmarchewka

This library is current using h-only style, and to use it correctly, you have either use the h-only style for your code or to include the library h files a little bit more carefully.

For example

A) h-only style

1. main.cpp

#include "UdpListener.h"

UdpListener udp_server;

void setup()
{
  delay(1);
}

void loop()
{
  delay(1);
}

---

2. UdpListener.h

#pragma once

#ifndef UDPLISTENER_H
#define UDPLISTENER_H

#include <AsyncUDP_WT32_ETH01.h>

class UdpListener
{

  private :

  public:
    UdpListener();
};

#include "UdpListener_Impl.h"

#endif

---

3. UdpListener_Impl.h

#pragma once

#ifndef UDPLISTENER_IMPL_H
#define UDPLISTENER_IMPL_H

UdpListener::UdpListener()
{
}

#endif

Also have a look at Fixed linker errors when included in multiple .cpp files #1

Anyway, I'll convert this outdated library later to use the same style as AsyncUDP_Teensy41 library, then you can use the example similar to multiFileProject

Thanks to @maxgerhardt for the providing the solution in https://community.platformio.org/t/multiple-include/28287

[wmarchewka]

Thanks all !

[khoih-prog]

Hi @wmarchewka

Check the new AsyncUDP_WT32_ETH01 release v2.1.0 and the multiFileProject

---

Releases v2.1.0

1. Fix multiple-definitions linker error. Check Multiple definitions #1
2. Add example multiFileProject to demo for multiple-file project to avoid multiple-definitions linker error