Fix binutils tools so that they can cope with the special /dev/null file when run on Windows systems.

PR 27252
 * bucomm.c (get_file_size): Add code to handle /dev/null on
 Windows systems.
 * elfedit.c (check_file): Likewise.

binutils/ChangeLog

@@ -1,3 +1,10 @@
+2021-01-28  Eli Zaretskii  <eliz@gnu.org>
+
+	PR 27252
+	* bucomm.c (get_file_size): Add code to handle /dev/null on
+	Windows systems.
+	* elfedit.c (check_file): Likewise.
+
 2021-01-27  Nick Clifton  <nickc@redhat.com>
 
 	* objcopy.c (copy_main): Remove conditional control of the calls

binutils/bucomm.c

@@ -623,6 +623,21 @@ get_file_size (const char * file_name)
   else if (statbuf.st_size < 0)
     non_fatal (_("Warning: '%s' has negative size, probably it is too large"),
                file_name);
+#if defined (_WIN32) && !defined (__CYGWIN__)
+  else if (statbuf.st_size == 0)
+    {
+      /* MS-Windows 'stat' doesn't reports the null device as a
+	 regular file; fix that.  */
+      int fd = open (file_name, O_RDONLY | O_BINARY);
+      if (isatty (fd))
+	{
+	  close (fd);
+	  non_fatal (_("Warning: '%s' is not an ordinary file"),
+		     /* libtool wants to see /dev/null in the output.  */
+		     strcasecmp (file_name, "nul") ? file_name : "/dev/null");
+	}
+    }
+#endif
   else
     return statbuf.st_size;
 

binutils/elfedit.c

@@ -721,6 +721,20 @@ check_file (const char *file_name, struct stat *statbuf_p)
       return 1;
     }
 
+#if defined (_WIN32) && !defined (__CYGWIN__)
+  else if (statbuf_p->st_size == 0)
+    {
+      /* MS-Windows 'stat' doesn't reports the null device as a
+	 regular file; fix that.  */
+      int fd = open (file_name, O_RDONLY | O_BINARY);
+      if (isatty (fd))
+	{
+	  statbuf_p->st_mode &= ~S_IFREG;
+	  statbuf_p->st_mode |= S_IFCHR;
+	}
+    }
+#endif
+
   if (! S_ISREG (statbuf_p->st_mode))
     {
       error (_("'%s' is not an ordinary file\n"), file_name);