Unsupported compiler 'org.llvm.8.1.1.clang.wrapper' selected for architecture 'x86_64'Unable to determine concrete GCC compiler for file

When I was working on a test, I connected my cellphone(iphone 5s) and my mac, and then I found that Xcode reported an error. Anyone who had solved this problem?Could you help me?

Unsupported compiler 'org.llvm.8.1.1.clang.wrapper' selected for architecture 'x86_64' Unable to determine concrete GCC compiler for file /Users/http://ift.tt/2t7uGU4 of type sourcecode.c.c. Unable to determine concrete GCC compiler for file /Users/http://ift.tt/2snp4bu of type sourcecode.c.c.