1 files changed, 30 insertions, 0 deletions
diff --git a/scripts/not.py b/scripts/not.py
new file mode 100755
index 000000000..98898f451
--- /dev/null
+++ b/scripts/not.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+# Copyright 2020 WebAssembly Community Group participants
+#
+# Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# 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.
+
+import sys
+import subprocess
+
+
+# Emulate the `not` tool from LLVM's test infrastructure for use with lit and
+# FileCheck. It succeeds if the given subcommand fails and vice versa.
+def main():
+    cmd = sys.argv[1:]
+    result = subprocess.run(cmd)
+    sys.exit(0 if result.returncode != 0 else 1)
+
+
+if __name__ == '__main__':
+    main()