[PATCH 3/3] native mingw32 gdb, eol format

[Yao Qi <yao@codesourcery.com>]

Hello,
I see the following fail on a remote windows host,

info tracepoints^M
Num     Type           Disp Enb Address    What^M^M
1       tracepoint     keep y   0x0040143f in gdb_c_test at actions.c:74^M^M
        not installed on target^M^M
2       tracepoint     keep y   0x00401687 in gdb_asm_test at actions.c:121^M^M
        not installed on target^M^M
3       tracepoint     keep y   0x004013d2 in gdb_recursion_test at actions.c:61^M^M
        not installed on target^M^M
(gdb) FAIL: gdb.trace/deltrace.exp: 3.1a: set three tracepoints

this fail is caused by an extra '\r' at end of each line.

on Windows, when a file is opened in text mode, a "\n" is always
expanded to "\r\n", so gdb on Windows is outputting "\r\n", and when
that goes throught the PTY, the '\n' is being expanded to "\r\n",
hence "\r\r\n".

This patch is to force stdin/stdout/stderr to binary mode prevents that
expansion.

gdb:

2013-07-25  Pedro Alves  <pedro@codesourcery.com>
	    Daniel Jacobowitz  <dan@codesourcery.com>
	    Yao Qi  <yao@codesourcery.com>

	* main.c [__MINGW32__]: Include fcntl.h and windows.h.
	(captured_main) [__MINGW32__]: If stdout, stdin and stderr
	are pipes, set them to binary mode.
---
 gdb/main.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/gdb/main.c b/gdb/main.c
index 4777286..3b871ee 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -47,6 +47,11 @@
 #include "filenames.h"
 #include "filestuff.h"
 
+#ifdef __MINGW32__
+#include <fcntl.h>
+#include <windows.h>
+#endif
+
 /* The selected interpreter.  This will be used as a set command
    variable, so it should always be malloc'ed - since
    do_setshow_command will free it.  */
@@ -753,12 +758,33 @@ captured_main (void *data)
 #ifdef __MINGW32__
   if (cygwin_tty)
     {
+      int in = fileno (stdin);
+      int out = fileno (stdout);
+      int err = fileno (stderr);
+      HANDLE hin = (HANDLE) _get_osfhandle (in);
+      HANDLE hout = (HANDLE) _get_osfhandle (out);
+      HANDLE herr = (HANDLE) _get_osfhandle (err);
+
       /* A Cygwin session may not look like a terminal to the Windows
 	 runtime; ensure unbuffered output.  Note that setvbuf may be
 	 used after the file is opened but before any other operation
 	 is performed.  */
       setvbuf (stdout, NULL, _IONBF, BUFSIZ);
       setvbuf (stderr, NULL, _IONBF, BUFSIZ);
+
+      /* In textmode, a '\n' is automatically expanded into "\r\n".  When
+	 driving the testsuite from a linux host, the '\n' is also
+	 expanded into "\r\n".  This results in expect seeing "\r\r\n".
+	 The tests aren't prepared currently for other forms of eol.  As a
+	 workaround, we force the output to binary mode.  Do this only if
+	 the files are pipes (cygwin ttys are Windows pipes behind the
+	 scenes).  */
+      if (GetFileType (hin) == FILE_TYPE_PIPE)
+	setmode (in, O_BINARY);
+      if (GetFileType (hout) == FILE_TYPE_PIPE)
+	setmode (out, O_BINARY);
+      if (GetFileType (herr) == FILE_TYPE_PIPE)
+	setmode (err, O_BINARY);
     }
 #endif
 
-- 
1.7.7.6