[RFA 2/6] Use ATTRIBUTE_UNUSED in some places

[Tom Tromey <tom@tromey.com>]

A few spots needed ATTRIBUTE_UNUSED to cope with the new warnings.

In the TUI this happens due to the odd way that "getyx" works -- it
essentially uses references, so a variable must be passed in, even if
the code doesn't need to use it.

The case in inflow.c is just a mass of ifdefs; and while the only use
of "result" is guarded by "#if 0", I thought it simplest to leave it
all in place.

2016-06-06  Tom Tromey  <tom@tromey.com>

	* tui/tui-winsource.c (tui_show_source_line): Use
	ATTRIBUTE_UNUSED.
	* tui/tui-io.c (tui_puts): Use ATTRIBUTE_UNUSED.
	(tui_redisplay_readline): Likewise.
	* inflow.c (child_terminal_ours_1): Use ATTRIBUTE_UNUSED.
---
 gdb/ChangeLog           | 8 ++++++++
 gdb/inflow.c            | 2 +-
 gdb/tui/tui-io.c        | 6 ++++--
 gdb/tui/tui-winsource.c | 3 ++-
 4 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 649bb0b..fbd7051 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,13 @@
 2016-06-06  Tom Tromey  <tom@tromey.com>
 
+	* tui/tui-winsource.c (tui_show_source_line): Use
+	ATTRIBUTE_UNUSED.
+	* tui/tui-io.c (tui_puts): Use ATTRIBUTE_UNUSED.
+	(tui_redisplay_readline): Likewise.
+	* inflow.c (child_terminal_ours_1): Use ATTRIBUTE_UNUSED.
+
+2016-06-06  Tom Tromey  <tom@tromey.com>
+
 	* corefile.c (reopen_exec_file): Only examine st.st_mtime if stat
 	succeeded.
 
diff --git a/gdb/inflow.c b/gdb/inflow.c
index 4c80dbd..9b94b29 100644
--- a/gdb/inflow.c
+++ b/gdb/inflow.c
@@ -419,7 +419,7 @@ child_terminal_ours_1 (int output_only)
          pgrp.  */
       sighandler_t osigttou = NULL;
 #endif
-      int result;
+      int result ATTRIBUTE_UNUSED;
 
 #ifdef SIGTTOU
       if (job_control)
diff --git a/gdb/tui/tui-io.c b/gdb/tui/tui-io.c
index 3fa32db..35025ce 100644
--- a/gdb/tui/tui-io.c
+++ b/gdb/tui/tui-io.c
@@ -172,7 +172,8 @@ tui_puts (const char *string)
 	  /* Expand TABs, since ncurses on MS-Windows doesn't.  */
 	  if (c == '\t')
 	    {
-	      int line, col;
+	      int line ATTRIBUTE_UNUSED;
+	      int col;
 
 	      getyx (w, line, col);
 	      do
@@ -198,7 +199,8 @@ tui_redisplay_readline (void)
 {
   int prev_col;
   int height;
-  int col, line;
+  int col;
+  int line ATTRIBUTE_UNUSED;
   int c_pos;
   int c_line;
   int in;
diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index 48975b6..48bfbe4 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -273,7 +273,8 @@ static void
 tui_show_source_line (struct tui_win_info *win_info, int lineno)
 {
   struct tui_win_element *line;
-  int x, y;
+  int x;
+  int y ATTRIBUTE_UNUSED;
 
   line = win_info->generic.content[lineno - 1];
   if (line->which_element.source.is_exec_point)
-- 
2.5.5