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#define and struct name

Hi, when I use gcc version 2.95.3-5 (cygwin special) to compile the
following code, it gives the two warnings below.  Meanwhile, Visual C++
compiles the same code without any warnings.  Is gcc or VC++ wrong here?
The preprocessed source outputs from gcc and VC++ are the same (when I
compile the code with -E), so I guess gcc and VC++ are treating the same
code differently.

Cheuk Cheng

pk.cpp:11: declaration of `struct thread * {anonymous struct}::thread'
pk.cpp:4: changes meaning of `thread' from `typedef struct thread_r


typedef struct thread_r
  int	num;
} thread;

#define Pk_Thread     thread

typedef struct
	int		size;
	Pk_Thread	*thread;
} FailData;

int main(int argc, char **argv)
  FailData mydata;

  mydata.size = sizeof(mydata);
  return 0;

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