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a question about gdb in emacs

From: x_uch
Subject: a question about gdb in emacs
Date: Wed, 4 Jun 2014 16:28:08 +0800 (CST)

While i debuged the application in windows that use emacs, the buffer of emacs 
can't get the output,but in system, everything is ok. I don't know where the 
error is in me or the emacs.
in windows , prommpt can get the output like this:

and in emacs ,gdb buffer like this:

Here is the application, i download from sqlite site,web address .In windows ,i 
compiled it using mingw,
using "gcc -g -o sqlite3 shell.c sqlite3.c" to build sqlite3.exe

I tried other app, source code:
#include <stdio.h>
typedef struct {
  float a;
  float b;
} substruct;

struct {
  int i;
  substruct r;
} c;

  int p;
  p = 2*n;
  printf("Two times %d is %d\n", n, p);

main() {
  int n = 4;
  int m[10] = {0,1,4,9,16,25,36,49,64,81};
  n = 5;
  c.i = 1;
  c.r.a = 0.5;
  c.r.b = 0.25;
saved it to test.c,build by gcc -o test test.c -g
in windows and emacs gdb all can get the output "Two times 5 is 10"
so i think the problem in emacs,but i have not enough time to read the source 
help me

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