Description

The C standard takes Harvard Architectures into account, for which program and data memory are distinct address spaces. This also means that they can have different address sizes, which e.g. for the AVR platform is the case: RAM addresses are always 16 bit wide and ROM addresses can be 22 bit wide (look up the program counter size).

As a result, the C standard forbids to cast function pointers (ROM address) to data pointers (RAM addresses). (This includes that void * pointers cannot be used to store a function address.)

Steps to reproduce the issue

Check this chunks of code:

Expected results

No cast from function pointer to data pointer and vice versa.

Actual results

A cast from function pointer to data pointer and the other direction is present.

Versions

Current master.

Discussion started in #14663