link the math library by default (#4713)

diff --git a/python/tvm/contrib/ndk.py b/python/tvm/contrib/ndk.py
index bada95f..66facae 100644 (file)
--- a/python/tvm/contrib/ndk.py
+++ b/python/tvm/contrib/ndk.py
@@ -51,7 +51,7 @@ def create_shared(output,
     else:
         cmd += objects
 
-    options = options if options else ["-shared", "-fPIC"]
+    options = options if options else ["-shared", "-fPIC", "-lm"]
     cmd += options
 
     proc = subprocess.Popen(