[lwip-users] Defining a function call via a macro in lwipopts.h

[Claude Robitaille]

I am trying to use this macro (from opts.h)

#define LWIP_HOOK_DHCP_APPEND_OPTIONS(netif, dhcp, state, msg, msg_type)

(from patch 40502, which results from task #14270).

Regardless of the detail of the patch, as I understand it, I need to define the macro with a function. This function is implemented in my driver. It takes a number of parameters with types defined by the library. I compile with -Werror=implicit-function-declaration, which is a good thing (I think). This causes the compilation to fail at the place where the macro is used (in dhcp.c), since it lacks the declaration for my function.

I tried to add this declaration in my lwipopts.h but this obviously fails since the lwip specific types are not defined yet.

What would be the correct way of declaring my functions?

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