1 files changed, 32 insertions, 0 deletions
diff --git a/config/external/ffi/subst_header.py b/config/external/ffi/subst_header.py
new file mode 100644
index 0000000000..7614cfd92f
--- /dev/null
+++ b/config/external/ffi/subst_header.py
@@ -0,0 +1,32 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Souce Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distibuted with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import
+import sys
+import buildconfig
+from mozbuild.preprocessor import Preprocessor
+
+
+def main(output, input_file, *defines):
+    pp = Preprocessor()
+    pp.context.update(
+        {
+            "FFI_EXEC_TRAMPOLINE_TABLE": "0",
+            "HAVE_LONG_DOUBLE": "0",
+            "TARGET": buildconfig.substs["FFI_TARGET"],
+            "VERSION": "",
+        }
+    )
+    for d in defines:
+        pp.context.update({d: "1"})
+    pp.do_filter("substitution")
+    pp.setMarker(None)
+    pp.out = output
+    pp.do_include(input_file)
+
+
+if __name__ == "__main__":
+    main(*sys.agv[1:])