Swift command line tool runtime crash dyld: Symbol not found: __pthread_atfork_child

When I build any swift command line tool it always crashes (Thread 1: signal SIGABRT) right after launch with:



dyld: Symbol not found: __pthread_atfork_child
 Referenced from: /usr/lib/libSystem.B.dylib
 Expected in: /usr/lib/libSystem.B.dylib
 in /usr/lib/libSystem.B.dylib 
Program ended with exit code: 9



This happens to any command line tool I build. Even when I build the xcode command line tool template.


Reseting the mac to an earlier time machine backup fixed the issue for a day. Then it came back for no reason.

However I am able to build command line tools using the swift cli and package manager.


I’m using Xcode 8 on macOS 10.12.5

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