Produce a consistent warning message when attempting to run a tool on a directory.

PR binutils/21659
	* bucomm.c (get_file_size): Explicitly warn if the file is a
	directory.

binutils/ChangeLog

@@ -1,3 +1,9 @@
+2017-06-26  Nick Clifton  <nickc@redhat.com>
+
+	PR binutils/21659
+	* bucomm.c (get_file_size): Explicitly warn if the file is a
+	directory.
+
 2017-06-24  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	* readelf.c (arm_attr_tag_CPU_arch): Fill value for ARMv8-R.

binutils/bucomm.c

@@ -598,6 +598,8 @@ get_file_size (const char * file_name)
 	non_fatal (_("Warning: could not locate '%s'.  reason: %s"),
 		   file_name, strerror (errno));
     }
+  else if (S_ISDIR (statbuf.st_mode))
+    non_fatal (_("Warning: '%s' is a directory"), file_name);
   else if (! S_ISREG (statbuf.st_mode))
     non_fatal (_("Warning: '%s' is not an ordinary file"), file_name);
   else if (statbuf.st_size < 0)