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cmmap

error: initializer element is not constant

int * const front  = mmap(0, sizeof(int),    PROT_READ|PROT_WRITE,           MAP_SHARED|MAP_ANONYMOUS, -1, 0);
int * const back   = mmap(0, sizeof(int),    PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0); 
int * const buffer = mmap(0, sizeof(int)*50, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0);

I am getting the following error: "error: initializer element is not constant"

How do I remove it? I know it won't work if I do something like int a[b];, but why is it happening here?

Solution

  • You haven't said, but it's pretty likely that you're working in C, not C++, and that these are variables with static duration? In C, you can only intialize a static variable with something that is a compile-time constant expression. A function-call is not a compile-time constant expression.