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interprocedural CFG


Can gcc provide an interprocedural CFG and dump it to a .vcg format file? I understand gcc provides intraprocedural CFG analysis, and wonder if interprocedural CFG is available. Thanks a lot.
Sean


for example,
//file name: main.c
extern void foo();
int main(){
int i=9;
if (i>0)
  foo();
else
  i++;
return 0;
}

//file name: foo.c
void foo(){
 int i=8;
 while(i>0)
   i--;
}

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