Static assert in C

README.md

Enum variant values have to be constant expression integers. Division by 0 does not yield an integer so the compilation fails.

main.c

#define static_assert(cond, msg) enum { a = 1 / (cond) }

static_assert((SOME_CONST & (SOME_CONST - 1)) == 0, "SOME_CONST has to be a power of 2");

int main() {
  int arr[SOME_CONST];

  return 0;
}