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Editorial Team
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Asked: 2026-05-14T04:03:14+00:00

i am building a C project with Xcode and when ever i build it

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i am building a C project with Xcode and when ever i build it it gives me this error:


ld: duplicate symbol _detectLinux in /Users/markszymanski/Desktop/Programming/C/iTermOS/build/iTermOS.build/Debug/iTermOS.build/Objects-normal/i386/linuxDetect.o and /Users/markszymanski/Desktop/Programming/C/iTermOS/build/iTermOS.build/Debug/iTermOS.build/Objects-normal/i386/iTermOS.o

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1 Answer

  1. Editorial Team

    This means you have defined the same symbol with global scope in (at least) two different source files — either a function or a global variable called _detectLinux, and apparently in the files linuxDetect.c and iTermOS.c.

    How to fix it depends on how you intend to use this symbol:

    • If you meant to define it in one file and use it in the other file, declare it extern in the other file.

    • If you only intend to use the symbol in the file that it is declared in, you can declare it static.

    • If the symbol is defined in both files, you can rename the symbol in one (or both) files.

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