For building v8 using gn on aix_ppc64, linux_s390x and linux_ppc64.

build/get_byteorder.py

Index: build/get_byteorder.py
diff --git a/build/get_byteorder.py b/build/get_byteorder.py
new file mode 100755
index 0000000000000000000000000000000000000000..084bb0d38a5dc81f5a3048385f595239a8634eb8
--- /dev/null
+++ b/build/get_byteorder.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+# Copyright 2014 The Chromium Authors. All rights reserved.

[Michael Achenbach, 2017/04/18 13:46:04]

nit: 2017

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Get Byteorder of host architecture"""
+
+
+import sys
+
+def main():
+  print sys.byteorder
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main())

[Michael Achenbach, 2017/04/18 13:46:04]

nit: Wonder if the boiler plate is necessary. Maybe replace lines 11-16 with:

print sys.byteorder

Or is gn loading the script as a library and calling main?