Thread: Question: Const var defining another const var

Hi there.

Could anyone please explain to me why, when I compile the following code with GCC I got an error?
Code:

Code:

#include <stdio.h>

const int CONSTANT_1 = 3;
const int CONSTANT_2 = CONSTANT_1 + 2;

int main (void) {

    printf("Constant 2 is: %d\n", CONSTANT_2);

    return 0;
}

The error I got is:
"test_const.c:4:1: error: initializer element is not constant
const int CONSTANT_2 = CONSTANT_1 + 2;"

When I run it in CLANG it works fine.

It also work (in GCC and CLANG) when in declare the constants inside the main function.

Thanks in advance.