diff --git a/compiler-rt/test/crt/lit.cfg.py b/compiler-rt/test/crt/lit.cfg.py
--- a/compiler-rt/test/crt/lit.cfg.py
+++ b/compiler-rt/test/crt/lit.cfg.py
@@ -9,6 +9,7 @@
 # Setup source root.
 config.test_source_root = os.path.dirname(__file__)
 
+execute_external = config.test_format.execute_external
 
 def get_library_path(file):
     cmd = subprocess.Popen([config.clang.strip(),