Some time ago, I asked the same question - and I got the answer, but I can
not easely locate the article. But I still remember what the answer was:
Yes it is a bug and the workaround is as follows:
- quit Eclipse
- In the file browser, go to your workspace and enable display of hidden
files.
- delete all files in
yourworkspace/.metadata/.plugins/org.eclipse.cdt.make.core
- restart eclipse