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how to extern structure?
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I have a following error and would appreciate any help.

================================================== ======

* in foo.c I have

typedef struct _my_data_t {
int a;
int b;
} my_data_t;

* in foo.h, I have

typede struct _my_data_t my_data_t;

* in foo2.c, I have

#include "foo.h"

int value = some_func(((my_data_t *)x)->a);

gcc complains "dereferencing pointer to incomplete type"

What didI do wrong here ? Is it correct to to definition in foo.h ?

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