Core: Add extra linker flag for BSD systems

As is, the ipfixcol2 symbols wouldn't be getting exported
and all plugins would fail with undefined reference errors
when trying to access them.

Author: sedmicha

src/core/CMakeLists.txt

@@ -79,6 +79,10 @@ target_link_libraries(ipfixcol2base
 
 # Build IPFIXCOL2 exacutable with all symbols from the base library
 set(BASE_LIB -Wl,--whole-archive ipfixcol2base -Wl,--no-whole-archive)
+if (CMAKE_HOST_SYSTEM_NAME STREQUAL "FreeBSD" OR CMAKE_HOST_SYSTEM_NAME STREQUAL "OpenBSD")
+    set(BASE_LIB ${BASE_LIB} -rdynamic)
+endif()
+
 add_executable(ipfixcol2 main.cpp)
 target_link_libraries(ipfixcol2 ${BASE_LIB})
 set_target_properties(ipfixcol2 PROPERTIES  # by default, hide all symbols