Linker command failed with exit code 1 In Xcode

Question

I'm writing C program in Xcode, and I got this problem:

ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Any idea to solve it?

Note: I've just update my OS to Mountain Lion yesterday.

Ideas to solve it: 1) if it tells you which symbol is duplicated, find out why there are multiple definitions. 2) if it doesn't, or you can't figure it out, post the code and the compiler and link commands — Useless
– Useless, Commented Jul 28, 2012 at 20:37

Nikolai Ruhe · Accepted Answer · 2014-08-28 15:16:19Z

2

A common error is to define a symbol in a header when you wanted to declare it:

When you for instance declare a global variable and forget the extern or you define an inline function and forget the inline. In these cases the compiler emits the symbol in each compile unit that includes this header and you end up with multiple definitions of a symbol.

Anyway you should just look for the symbol in question.

edited Aug 28, 2014 at 15:16

answered Jul 28, 2012 at 20:44

Nikolai Ruhe

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