xcode上編譯c語言程序報錯：ld: x duplicate symbol for architecture x86_64 clang: error: linker command failed

最近使用Xcode編譯C語言程序，發如今多文件運行時總會有error提示： duplicate symbol _fp in: /Users/taiyoshimichi/Library/Developer/Xcode/DerivedData/C語言_13-gjzrgznjeglgthfzreqxzniqfjxr/Build/Intermediates/C語言_13.build/Debug/C

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