Eclipse indexing not working

Question

I am using CDT in Eclipse 3.5.2 Galileo in Ubuntu.

My eclipse\'s indexer doesn\'t work at times. By that I mean when I ctrl click a function it says

Answer 1

I believe you can clear the index by running:

rm .metadata/.plugins/org.eclipse.jdt.core/*.index

And then restarting Eclipse. It will then rebuild its index.

This worked for me in a Java project, but I imagine its the same index for all (most?) project types.