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xcodemacosprogram-entry-pointundefined-symbol

Compiling error in Mac OS X

I am trying to compile a file in Mac OS X but keep on getting the error

Undefined symbols:
  "_main", referenced from:
      start in crt1.10.6.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

Could any one help to find out what this error means?

Solution

  • You are missing main definition in the program which is the starting point of any executable. So, linker is complaining because it didn't find the entry point ( which is main ) for the final executable.

    Undefined symbols:
"_main",

    Meaning there is no _main in any of the source files compiled. ( i.e., int main(void), int main( int agrc, const char* argv[] in C, C++ )

    ld: symbol(s) not found

    Meaning it is a linker error. Linker binds all the object files to a single executable. At this time it checks whether there is entry point at all for the executable. It isn't in your case, so it is complaining.