gdb/

	* event-top.c (gdb_setup_readline): Call stderr_fileopen
	instead of stdio_fileopen.
	* main.c (captured_main) [__MINGW32__]: Set stderr unbuffered.
	.Call stderr_fileopen instead of stdio_fileopen.
	* ui-file.c [__MINGW32__] (stderr_file_write): New function.
	[__MINGW32__] (stderr_file_fputs): New function.
	(stderr_fileopen): New function.
	* ui-file.h (stderr_fileopen): Declare.

1 files changed, 8 insertions, 1 deletions

diff --git a/gdb/main.c b/gdb/main.c
index 1c240e4..11f4b03 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -375,8 +375,15 @@ captured_main (void *data)
   saved_command_line[0] = '\0';
   instream = stdin;
 
+#ifdef __MINGW32__
+  /* Ensure stderr is unbuffered.  A Cygwin pty or pipe is implemented
+     as a Windows pipe, and Windows buffers on pipes.  */
+  setvbuf (stderr, NULL, _IONBF, BUFSIZ);
+#endif
+
   gdb_stdout = stdio_fileopen (stdout);
-  gdb_stderr = stdio_fileopen (stderr);
+  gdb_stderr = stderr_fileopen ();
+
   gdb_stdlog = gdb_stderr;	/* for moment */
   gdb_stdtarg = gdb_stderr;	/* for moment */
   gdb_stdin = stdio_fileopen (stdin);