Make the ybcon executable truly position-independent.

CMakeLists.txt

@@ -19,6 +19,12 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
 set(CMAKE_CXX_FLAGS "-Wall")
+if (CMAKE_POSITION_INDEPENDENT_CODE)
+    include(CheckPIESupported)
+    add_link_options("-pie")
+    check_pie_supported()
+endif()
+
 if (NOT MSVC)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
 endif()