Resolved: Casting const void* const to const char* const produces the “ignored-qualifiers” warning, why?

In this post, we will see how to resolve Casting const void* const to const char* const produces the “ignored-qualifiers” warning, why?

Question:

I don’t understand why the following code gives the “type qualifiers ignored on cast result type” warning in GCC, can you please explain?
https://godbolt.org/z/n8Ws9aTcq

Best Answer:

A non-class non-array prvalue cannot be cv-qualified.
This means that your static_cast<const char* const>(a) is exactly the same as static_cast<const char*>(a), the pointer itself isn’t const-qualified. It’s simply discarded, which is what the warning is telling you about (the second const is what is being ignored)

If you have better answer, please add a comment about this, thank you!

Source: Stackoverflow.com