“go build”不生成golang中的文件

Question

我用go build生成文件。但我只能生成main，这意味着go build main.go工作，而go build dao.go不会产生任何东西？

如何生成dao？

Answer 1

从go help build：

When the command line specifies a single main package, 
build writes the resulting executable to output. 
Otherwise build compiles the packages but discards the results, 
serving only as a check that the packages can be built.