How do I fix 'symbol not found' on macOS in C++?

When you encounter a 'symbol not found' error in C++ on macOS, it typically indicates that the linker cannot find a function or variable that has been declared but not defined, or it may be due to missing libraries. Here's how to troubleshoot and resolve this issue.

#include 

// Function Declaration
void myFunction();

int main() {
    myFunction(); // Call the function
    return 0; // Exit successfully
}

// Missing Function Definition
/*
void myFunction() {
    std::cout << "Hello from myFunction!" << std::endl;
}
*/

// To fix the 'symbol not found' error, ensure the function is defined:
// Uncomment the function definition above