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

1. Execute eclipse.exe -clean -refresh where the eclipse is installed.
2. Create a new C/C++ Project in Eclipse with Given Source code folder path. (Not with New Project based on existing workspace)

Above steps worked for me.