warning: Missing file: is missing from working copy
fatal error: file '….h' has been modified since the precompiled header was built
的解决办法
http://stackoverflow.com/questions/5897232/how-to-remove-properly-a-file-on-xcode-4-with-svn-version-control
To prevent the error from occurring in the first place, always "Delete" through Xcode, or, through your SVN client (but, if you delete it through your SVN client you'll still have to delete the missing reference in Xcode - so you might as well just delete it in Xcode to being with).
http://stackoverflow.com/questions/7071523/xcode-4-1-fatal-error-stdlib-modified-since-the-precompiled-header-was-built
I had this exact same problem after applying the recent Xcode patch. I ended up deleting the DerivedData folder for my app at:
~/Library/Developer/Xcode/DerivedData/{project name + gobly-gook}
This directory contains built products and indexes for the project. It is OK to delete it because it only contains items generated by Xcode. Xcode will regenerate everything next time the project is opened.