For most make projects, you will want to parse the output of the build to populate your paths and symbols tables.
To do so:
There are currently three discovery profiles available on a Per project basis - all discovered paths and symbols are associated with the project; all files use this information.
For both profiles there is an option to discover paths and symbols
based on a previous build output. To activate the discovery select a
build log file and then the Load
button.
Converting CDT 1.x Projects
C/C++ Project
Properties, Discovery Options