Extended Description

Example:

$ cat cl.c
struct S {
int a, b, c;
};

struct S foo(void);

int main(void) {
struct S s = foo();
if (s.a != 1)
return 1;
if (s.b != 2)
return 2;
if (s.c != 3)
return 3;
return 0;
}

int printf(const char *fmt, ...);

void do_something_complex(void) {
printf("%d %d %d %d\n", 1, 2, 3, 4);
}

struct S {
int a, b, c;
};

struct S foo(void) {
struct S ret;
ret.a = 1;
ret.b = 2;
ret.c = 3;
do_something_complex();
return ret;
}

$ cl cl.c clang.c && ./cl.exe; echo $?
-> works fine

As of r177589,
$ clang clang.c -c && cl -c cl.c && link clang.o cl.obj && ./clang.exe ; echo $?
-> Segmentation Fault after the printf.