Position independent code

cpp/CMakeLists.txt

@@ -78,7 +78,7 @@ target_include_directories(
 # Using pybind11 requires using -fvisibility=hidden. See
 # https://pybind11.readthedocs.io/en/stable/faq.html
 target_compile_options(radler PUBLIC -O3 -Wall -Wzero-as-null-pointer-constant
-                                     -fvisibility=hidden)
+                                     -fvisibility=hidden -fPIC)
 
 if(NOT PORTABLE)
   if(DEFINED TARGET_CPU)