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The issue I had was with a piece of my own (shoddy) code. Apple support provided the following which allowed me to locate the failing class and, following a rewrite, I can now release.1. Open Activity Monitor.2. Start your project building.3. Wait for the the build’s progress to completely stop for several minutes.4. Locate the Swift processes in Activity Monitor (they should be using nearly 100% CPU) and select one of them.5. In the menu bar, select “View”, then “Send Signal To Process…”6. Select “Abort (SIGABRT)” from the drop-down list.7. Click the “Send” button. This will simulate an assertion failing, so the compiler will print information about what it’s doing and then exit.8. In Xcode, switch to the Report Navigator (the “speech bubble” button over the left-side pane) and select the build.9. Scroll down to the now-failed compilation step and click the transcript button (button with five lines, to the right of the “Compile [Filename]” line).10. Scroll down to see the diagnostic information. It will probably include a list of command-line flags, a few lines saying things like “In pass SimplifyCFG”, and a stack trace.

Not really adding anything other than to register that we are also suffering this issue. Debug build works fine, Release hangs with no obvious workable solution. I have tried pod deintegrate and pod install but no change, still fails to build and hangs at the same point. I have raised and issue, FB7315222.