问题
After upgrading from Xcode 4.2 to Xcode 4.3, the instruments command line tool fails with the following error:
Error: No developer directory found at /Developer. Run /usr/bin/xcode-select to update the developer directory path.
回答1:
sudo /usr/bin/xcode-select -switch /Applications/Xcode.app/Contents/Developer
来源：https://stackoverflow.com/questions/9485320/after-upgrading-from-xcode-4-2-to-xcode-4-3-instruments-command-line-fails