Error “initializer element is not constant” when trying to initialize variable with const

Question

I get an error on line 6 (initialize my_foo to foo_init) of the following program and I\'m not sure I understand why.

typedef struct foo_t {
    int a, b, c;         


        

Answer 1

This is a bit old, but I ran into a similar issue. You can do this if you use a pointer:

#include 
typedef struct foo_t  {
    int a; int b; int c;
} foo_t;
static const foo_t s_FooInit = { .a=1, .b=2, .c=3 };
// or a pointer
static const foo_t *const s_pFooInit = (&(const foo_t){ .a=2, .b=4, .c=6 });
int main (int argc, char **argv) {
    const foo_t *const f1 = &s_FooInit;
    const foo_t *const f2 = s_pFooInit;
    printf("Foo1 = %d, %d, %d\n", f1->a, f1->b, f1->c);
    printf("Foo2 = %d, %d, %d\n", f2->a, f2->b, f2->c);
    return 0;
}