I\'ve been working with Eclipse 4.2 (Juno release 20120920-0800) on OS X 10.8.2 for a few weeks now, building apps for Android 3.0 and above. I have a quad core i7 MacBook P
Same problem, stuck at 0%. Ran
/Applications/eclipse/eclipse -clean
and everything worked great again. Modify that path for linux boxes.
Update (from the remark from @Janusz )
For mac users with eclipse outside application directory your clean command will looks similar to:
path/eclipse/Eclipse.app/Contents/MacOS/eclipse -clean