Start electronics If you get an error like the one below, you should check to make sure that you are not declaring the same function as another file.
ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
This time the error occurred because the declaration int main(int argc, const char * argv[]){ XXX } was declared in both main.m and main.c.
In this case, it looked like only main.c would be used, so I commented out this declaration in main.m to solve the problem.
In C, it seems that the compiler automatically reads other files as well.
The following sites are helpful.
http://d.hatena.ne.jp/hadashia/20121119/1353341718
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