Nios II builds the library file and is called in the new project

Select Nios II Library

Choose location, so the library file is independent, and if you choose Make library depend on a BSP will rely on the BSP, if the BSP is deleted, the new project will be compiled error.

Add C source files and H header files

Then build project

Then create a new project:

File->nios II application and BSP from Template

Then add the search path to the library file in the project:

Right-click the project file->properties-> expand nios II Application properties-> Select Nios Application Paths

Add the Library project top-level file in library projects, add the directory containing the library header files to the application include directories, and in the Application library directories Add a directory containing the. A file in the library name, as shown in

Then select OK,

Finally compile the project file, build project.