I run into similar situations with any major change. Lately, if I get a failure such as that, I delete the intermediate directory and run a build from XCode to start the Editor. If that doesn't fix it, I open the editor without having XCode open, and click the menu entry that says 'Refresh code project' (it's in the area where you can create a new class).
Mac OS X 10.9 (Mavericks), Mac OS X 10.8 (Mountain Lion) and Xcode 5 Both Mountain Lion and Mavericks support and now use XCode 5, which no longer provides GCC, only Clang. This should not be problem for GHC 7.8 and newer, but If using GHC 7.6. or older, one of several work arounds is needed!
Apple Xcode is Apple Computer’s integrated development environment (IDE) for OS X.The full Xcode package is free to ADC members and includes all the tools you need to create, debug, and optimize your own Universal applications, targeting both Intel and PowerPC platforms. SwiftUI is an innovative, exceptionally simple way to build user. Note: Xcode 9 is only supported for application development (to be able to opt out of features such as layer-backing and dark mode), not for development of Qt itself. Build Environment. The build environment on macOS is defined entirely by the Xcode version used to build your application. Xcode contains both a toolchain (compiler, linker, and other tools), and a macOS platform-SDK (headers.
Be sure you select your project name in the scheme pulldown of XCode. I have seen it magically switch to the UE4 scheme which does not work. This seems to get reset incorrectly after adding a class, but it may have happened to me the other day by the 'Build XCode Project' under Right Click -> Services in Finder.
Lots of odd stuff happens since 4.10 and the change to how XCode projects are set up. Fortunately, though very annoying at the time, fiddling around eventually gets the compiles working again. So far, the most consistent action that seems to break the compiles, is to add a class to the C++ project.
The fix you describe was what I had to do. The actual problem was that I had originally set up UE under a different username on the system. Some components had permissions issues in the Shared folder. May not apply to why yours was broke, but I thought I'd mention it in case someone happens on this question.
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