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void foo(struct cpu_state *);
 
struct cpu_state { int bar; };
 
void bar(struct cpu_state *p)
{
    foo(p);
}
 
int main()
{
    struct cpu_state t;
    bar(&t);
    return 0;
}

prog.c:1: warning: ‘struct cpu_state’ declared inside parameter list
prog.c:1: warning: its scope is only this definition or declaration, which is probably not what you want
prog.c: In function ‘bar’:
prog.c:7: warning: passing argument 1 of ‘foo’ from incompatible pointer type
/home/vz5DDQ/cc1XUItb.o: In function `main':
prog.c:(.text+0x26): undefined reference to `foo'
/home/vz5DDQ/cc1XUItb.o: In function `bar':
prog.c:(.text+0x1): undefined reference to `foo'
collect2: ld returned 1 exit status

Standard output is empty