The Paths and Symbols pane shows the paths and symbols used to the build the project index. This is a read-only list based on the setting of the Build configuration for the indexer option in the C/C++ General > Indexer panel. Carbide now caches the paths and symbols which persist between debug sessions. If any of the files like bld.inf, MMP, or any of their include files change, the list is automatically recalculated and CDT notified.
To change what appears in the list:
You can also specify a macro file using the Macro Settings page in the Properties for project dialog.
Figure 1 - Paths and Symbols pane