Added -fPIC flag for sdk_core compilation

sdk_core/CMakeLists.txt

@@ -27,6 +27,7 @@ else(WIN32)
 endif (WIN32)
 
 target_compile_options(${SDK_LIBRARY}
+        PRIVATE $<$<CXX_COMPILER_ID:GNU>:-Wno-missing-field-initializers -fPIC>
         PRIVATE $<$<CXX_COMPILER_ID:GNU>:-Wall -Werror -Wno-c++11-long-long>
         PRIVATE $<$<CXX_COMPILER_ID:AppleClang>:-Wno-unknown-pragmas -Wall -Werror -Wno-c++11-long-long>
         PRIVATE $<$<CXX_COMPILER_ID:Clang>:-Wno-unknown-pragmas -Wall -Werror -Wno-c++11-long-long>)
@@ -88,4 +89,4 @@ target_sources(${SDK_LIBRARY}
 install(TARGETS ${SDK_LIBRARY}
         PUBLIC_HEADER DESTINATION include
         ARCHIVE DESTINATION lib
-        LIBRARY DESTINATION lib)
+        LIBRARY DESTINATION lib)