Xcode 10 GM libstdc++ error, can't run on simulator
removed '/usr/lib/libstdc++.6.0.9.dylib' from the 'OTHER_LDFLAGS', seems to be fine again.
libstc is removed in iOS 12 and was first deprecated in Xcode 10. You can however manually add this library in Simulator or update your dependency to use libc++.
Refer this link for manually adding these libraries - libstdc