* ui-file.c (stdio_file_write_async_safe): Add comment.

gdb/ChangeLog

@@ -1,3 +1,7 @@
+2011-05-13  Doug Evans  <dje@google.com>
+
+	* ui-file.c (stdio_file_write_async_safe): Add comment.
+
 2011-05-14  Hui Zhu  <teawater@gmail.com>
 
 	* ui-file.c (stdio_file_write_async_safe): Add empty check for build.

gdb/ui-file.c

@@ -580,6 +580,9 @@ stdio_file_write_async_safe (struct ui_file *file,
       return;
     }
 
+  /* This is written the way it is to avoid a warning from gcc about not using the
+     result of write (since it can be declared with attribute warn_unused_result).
+     Alas casting to void doesn't work for this.  */
   if (write (stdio->fd, buf, length_buf))
     ;
 }