Nios IDE 9.1: Warning: Invalid project path: Duplicate path entries (with solution)

Tool: Nios II, IDE 9.1, SP2

Description: After compilation, it shows warning like: Invalid project path: Duplicate path entries

Solution:

1. Select project that introduce this issue -> Properties -> C/C++ Include Paths and Symbols

As shown in the following example picture-1, you can see there are 4 paths included both in “CDT Managed Build Project” and “Discovered Paths”

2. Select “Discovered Paths” -> click “Edit” button on the right side

As shown in the following example picture-2, select these 4 duplicate paths, then click “Disable” button on the right side (DON’T click “Delete”). Finally click “Finish” and then “OK”.

In step 2, the reason to don’t click “Delete” is that each time you run IDE, it automatically discoveries these paths even they make problem during compilation.

Hope this post is helpful.