What difference of file write operation between MSVC and MINGW421?

Code C++ - [expand]
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#define FILE_WRITE 1
/*
#undef FILE_WRITE
*/
struct fir: sc_module{  
  sc_in<bool>  reset;
  sc_in<bool>  input_valid;        
  sc_in<int>   sample;          
  sc_out<bool> output_data_ready;
  sc_out<int>  result;
  sc_in_clk    CLK;
  int          index;
#ifdef FILE_WRITE
  FILE* fp_real;//  ofstream       myfile;
#endif
  sc_int<9> coefs[16];
 
  SC_CTOR(fir)
     {      
      SC_CTHREAD(entry, CLK.pos());
      reset_signal_is(reset,true);
      #include "fir_const.h"
    }
  
  void entry();
 
#ifdef FILE_WRITE
  ~fir()
  {
    fclose( fp_real );
  }
#endif
};

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void fir::entry() {
 
  sc_int<8>  sample_tmp;
  sc_int<17> pro;
  sc_int<19> acc;
  sc_int<8> shift[16];
  sc_uint<16> val;  //variable to hold data
  int tmp_out;
 
  // reset watching
  /* this would be an unrolled loop */
#ifdef FILE_WRITE    
  fp_real = fopen("out_example.txt","w");
#endif 
  
  for (int i=0; i<=15; i++) 
    shift[i] = 0;
  result.write(0);
  output_data_ready.write(false);
  wait();
 
  // main functionality
  index=0;
 
  while(1) {
    output_data_ready.write(false);
    do 
    { 
      wait(); 
    }while ( !(input_valid == true) );
    sample_tmp = sample.read();
    acc = sample_tmp*coefs[0];
 
    for(int i=14; i>=0; i--) {
      /* this would be an unrolled loop */
      pro = shift[i]*coefs[i+1];
      acc += pro;
    };
 
    for(int i=14; i>=0; i--) {
      /* this would be an unrolled loop */
      shift[i+1] = shift[i];
    };
 
    shift[0] = sample_tmp;
    // write output values
    result.write((int)acc); 
    output_data_ready.write(true);/*
    myfile << "shift[xxxxxx]";
    myfile << "index=" << index << endl;
    cout << "index=" << index << endl;*/
#ifdef FILE_WRITE    
//    fprintf(fp_real,"%d  \n", tmp_out);
#endif    
    index++;
    wait();
  };
}