modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/mayalias-2.c (about) 1 typedef struct __attribute__((__may_alias__)) { short x; } test; 2 3 int f() { 4 int a=10; 5 test *p=(test *)&a; 6 p->x = 1; 7 return a; 8 } 9 10 int main() { 11 if (f() == 10) 12 __builtin_abort(); 13 return 0; 14 } 15 16