My project is running fine up to xcode version 4.3, when I updated it to version 4.4 it shows failed without any error on building the code, I have tried searching over Google and try every possible step but not able to solve my problem.
I had this issue. I didn't realise I had somehow filtered the errors by a single space at the bottom of the errors tab :(. Removing the filter at the bottom of the errors page sorted it all out.
I have solved my problem by installing command line tools from