Summary: When turning on DWARF with dSYM File, my Xcode build hangs on the "Generating dSYM" step. If I let the build continue, that step will complete in about 20 minutes but my system freezes. On Xcode 9, this step took about 30 seconds.
Steps to Reproduce: Turn on DWARF with dSYM File in your Build Settings. Start a build.
Expected Results: "Generating dSYM" step takes a reasonable amount of time and doesn't freeze your Mac.
Actual Results: "Generating dSYM" step takes 20 minutes and freezes my Mac.
Version/Build: I only tested on Xcode 10 Beta 4 and Xcode 10 Beta 6 and both experience this issue. I am also using the Legacy Build system.
Files: I have attached a log in rdar://43332192