[PATCH] native mingw32 gdb, eol format

[Yao Qi <yao@codesourcery.com>]

Hello,
I see the following fail on a remote windows host for mingw32 native
gdb,

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 through the PTY, the '\n' is being expanded to "\r\n",
hence "\r\r\n".

This patch, which was written by Pedro, is to force stdout/stderr to
binary mode prevents that expansion.  This patch gets much
improvement on the test result of  mingw native gdb.  Is it OK?

                === gdb Summary ===

-# of expected passes           11845
-# of unexpected failures       2931
-# of expected failures         22
-# of unknown successes         1
-# of known failures            20
-# of unresolved testcases      911
-# of untested testcases                131
-# of unsupported tests         84
+# of expected passes           14613
+# of unexpected failures       780
+# of unexpected successes      1
+# of expected failures         37
+# of known failures            35
+# of unresolved testcases      23
+# of untested testcases                130
+# of unsupported tests         94


gdb:

2013-07-16  Pedro Alves  <pedro@codesourcery.com>
	    Yao Qi  <yao@codesourcery.com>

	* mingw-hdep.c (_initialize_mingw_hdep): If stdout and stderr
	are pipes, set them to binary mode.
---
 gdb/mingw-hdep.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/gdb/mingw-hdep.c b/gdb/mingw-hdep.c
index efc9848..3b29495 100644
--- a/gdb/mingw-hdep.c
+++ b/gdb/mingw-hdep.c
@@ -271,5 +271,24 @@ extern initialize_file_ftype _initialize_mingw_hdep;
 void
 _initialize_mingw_hdep (void)
 {
+  int out = fileno (stdout);
+  int err = fileno (stderr);
+  HANDLE hout = (HANDLE) _get_osfhandle (out);
+  HANDLE herr = (HANDLE) _get_osfhandle (err);
+
+  /* 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 (hout) == FILE_TYPE_PIPE
+      && GetFileType (herr) == FILE_TYPE_PIPE)
+    {
+      setmode (out, O_BINARY);
+      setmode (err, O_BINARY);
+    }
+
   sigint_event = CreateEvent (0, FALSE, FALSE, 0);
 }
-- 
1.7.7.6