Avoid creation of outputfile on failure of dependency script + add beri license header

builds/Resources/genDependencies.tcl

@@ -1,4 +1,31 @@
 #! /usr/bin/env bluetcl
+#
+# Copyright (c) 2020 Alexandre Joannou
+# All rights reserved.
+#
+# This software was developed by SRI International and the University of
+# Cambridge Computer Laboratory (Department of Computer Science and
+# Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
+# DARPA SSITH research programme.
+#
+# @BERI_LICENSE_HEADER_START@
+#
+# Licensed to BERI Open Systems C.I.C. (BERI) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  BERI licenses this
+# file to you under the BERI Hardware-Software License, Version 1.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at:
+#
+#   http://www.beri-open-systems.org/legal/license-1-0.txt
+#
+# Unless required by applicable law or agreed to in writing, Work distributed
+# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+# CONDITIONS OF ANY KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations under the License.
+#
+# @BERI_LICENSE_HEADER_END@
+#
 
 namespace import ::Bluetcl::*
 
@@ -73,12 +100,19 @@ if { $argc > 0 } { foreach i $argv { flags set $i } }
 # }
 # reformating it for make
 ################################################################################
-
-set fd [open $outputfile w]
-foreach i [depend make $topfile] {
-  set tgt [lindex $i 0]
-  set deps [join [lindex $i 1]]
-  puts $fd [append tgt ": " $deps]
+try {
+  set res [depend make $topfile]
+} finally {
+  if { [info exists res] } {
+    set fd [open $outputfile w]
+    foreach i $res {
+      set tgt [lindex $i 0]
+      set deps [join [lindex $i 1]]
+      puts $fd [append tgt ": " $deps]
+    }
+    close $fd
+    puts "generated make dependency rules for \"$topfile\" in: $outputfile"
+  } else {
+    puts "could not generate make dependency rules for \"$topfile\""
+  }
 }
-close $fd
-puts "generated make dependency rules for \"$topfile\" in: $outputfile"