What could be the possible reason of linking errors on "_info" and "_closure"?

Hi, I am making a cabal project including a library and a executable using the library. Building the library is fine. But when linking src/main, I got "undefined reference to someFunction1_info" and "someFunction1_closure". -- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.