gcc/testsuite/gcc.dg/Wdesignated-init-2.c

/* PR c/59855 */
/* { dg-do compile } */
/* { dg-options "-std=gnu11" } */

struct S {
    int a;
    union {
        int b;
        int c;
    };
} __attribute__((designated_init));

struct S s1 = { .a = 0, .b = 0 };
struct S s2 = { 0, 0 }; /* { dg-warning "(positional|near initialization)" } */
struct S s3 = { .a = 5, 0 }; /* { dg-warning "(positional|near initialization)" } */