Thread: struct with array of compile-time decided length via macro

I need something like this:

Code:

#define x 5;

struct A{
    int array[x];
};

void main(void){
    struct A a = {0};

    for (int i = 0; i < x; ++i)
    {
        a.array[i] = rand();
    }
}

But it's complaining:
line 1: error: expected ']' before ';' token
line 10: error: expected expression before ';' token

How do I make it work? I thought that macros were just like find/replace instructions for the compiler... Apparently not? I'm using gcc 9.3.0 targeting x86-64
I'd rather not use something like

Code:

struct A{
    int* array;
}

because then the array's position in memory is not necessarily anywhere near the position of the struct. Apart from having to manually allocate the array's memory.

#defines don't normally end in a ;