[xenadu02]

This kind of problem is almost always extremely project-specific. There are an infinite variety of compiler flags, custom build steps, etc.

Set "defaults write com.apple.dt.Xcode IDESourceKitServiceLogLevel 3" and SourceKit will write a log to /tmp with all the details of what it is doing while indexing. A lot of people find they have header hygiene problems or module problems that happen to work while building in certain configurations but aren't actually correct, resulting in missing modules or broken headers from the indexer's point of view.

Dealing with C/C++ headers, includes, modules, et al is part of the reason a lot of editors never bother with trying to offer complicated refactoring, autocomplete, etc. It is far from trivial no matter what build system you are using.

If you file a bug report and attach your project someone on the indexer team will personally take a look.

[valuearb]

Thank you.