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/* { dg-do compile } */
/* { dg-options "-O2 -fno-strict-aliasing -fwrapv -fexcess-precision=standard" } */
extern int foo();
typedef struct {
char id;
unsigned char fork_flags;
short data_length;
} Header;
int a;
void X() {
do {
char* b;
Header c;
if (a)
c.fork_flags |= 1;
__builtin_memcpy(b, &c, __builtin_offsetof(Header, data_length));
b += foo();
} while (1);
}
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