Final answer:
The error message "undefined symbols for architecture x86_64" suggests that the linker can't find implementations for declared symbols or mismatches in the targeted architecture. To resolve it, include all necessary files/libraries, verify build settings, and ensure the correct compilation for the x86_64 architecture.
Step-by-step explanation:
The error message "undefined symbols for architecture x86_64" typically indicates that the linker is unable to find the implementation code for some functions or variables that are declared but not defined or for symbols that are defined for a different architecture than the one being targeted.
This can occur for several reasons: missing source files or libraries in the build process, incorrect project configuration, or symbols being compiled for a different architecture than the one expected. To resolve these issues, you should ensure that all necessary source files and libraries are included in your project, double-check to make sure that your build settings are correct, and verify that the architecture for which the code is compiled matches the targeted architecture, which in this case is x86_64.