How to eliminate the “discard qualifier” warning?

Question

Using GCC and C99 mode, I have a function declared as:

void func(float *X);

When I call the function, I use a volatile array Y:

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Answer 1

No, you can't turn that warning off. It's telling you you're violating the type system. If you want to call func you either need to pass it pointers to non-volatile data or change the function signature to accept pointers to volatile data.