Undefined symbols for architecture x86_64

[7LH0rse]

I'm reading this chapter of BuildYourOwnLisp Book, and I'm trying to write a tiny language Venus (just for fun) using mpc, my directory tree (for now) looks like this:

Venus
  ┠ mpc.c
  ┠ mpc.h
  ┗ parsing.c

In parsing.c:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mpc.h"

#ifdef _WIN32
    static char buffer[2048];
    char* readline(char* prompt) {
        fputs(prompt, stdout);
        fgets(buffer, 2048, stdin);
        char* cpy = malloc(strlen(buffer)+1);
        strcpy(cpy, buffer);
        cpy[strlen(cpy)-1] = '\0';
        return cpy;
    }
    void add_history(char* unused) {}

#else
    #ifdef __linux__
        #include <editline/readline.h>
        #include <editline/history.h>
    #endif

    #ifdef __MACH__
        #include <editline/readline.h>
    #endif
#endif


int main(int argc, char **argv)
{

    mpc_parser_t* Number = mpc_new("number");
    mpc_parser_t* Operator = mpc_new("operator");
    mpc_parser_t* Expression = mpc_new("expression");
    mpc_parser_t* Venus = mpc_new("venus");

    mpca_lang(MPCA_LANG_DEFAULT, 
    "\
      number     : /-?[0-9]+/ ;                            \
      operator   : '+' '-' '*' '/' ;                       \
      expression : <number> | '(' <operator> <expr>+ ')' ; \
      venus      : /^/ <operator> <expression>+ /$/ ;      \
    ", Number, Operator, Expression, Venus);

    printf("\
__ __\n\
\\ V / enus 1.0.0\n\
 \\ /  %s in %s\n\
  V   Tip: Use :exit or :help command to quit / get info.\n\
",
           __TIME__, __DATE__);

    // Main Loop
    while (1)
    {
        char *input = readline("\n> ");
        add_history(input);

        // Check if executing :exit or :help.
        if (strcmp(input, ":exit") == 0)
            exit(0);
        if (strcmp(input, "") == 0)
            continue;
        if (strcmp(input, ":help") == 0)
        {
            printf("\nAuthor: TLHorse\nA tiny programming lang.\n");
            continue;
        }

        mpc_result_t result;
        if (mpc_parse("<stdin>", input, Venus, &result)) {
            mpc_ast_print(result.output);
            mpc_ast_delete(result.output);
        } else {
            mpc_error_print(result.error);
            mpc_error_delete(result.error);
        }
        free(input);
    }

    return 0;
}

NOTE THAT my mpc expressions in parsing.c isn't done yet.

When I finish my code, I used

cc -std=c99 -Wall parsing.c mpc.c -ledit -lm -o parsing

But 2 warnings and 1 error generated:

tlhorse@tlhmac Venus % cc -std=c99 -Wall parsing.c mpc.c -ledit -lm -o parsing 
parsing.c:78:13: warning: implicit declaration of function 'mpc_error_print' is invalid in C99 [-Wimplicit-function-declaration]
            mpc_error_print(result.error);
            ^
parsing.c:79:13: warning: implicit declaration of function 'mpc_error_delete' is invalid in C99 [-Wimplicit-function-declaration]
            mpc_error_delete(result.error);
            ^
2 warnings generated.
Undefined symbols for architecture x86_64:
  "_mpc_error_delete", referenced from:
      _main in parsing-4a1667.o
  "_mpc_error_print", referenced from:
      _main in parsing-4a1667.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Actually the warnings are insignificant, but the error is torturing me.
WHY THE HELL THAT the symbols _mpc_error_delete and _mpc_error_print are ALWAYS not found for architecture x86_64???

I'm just a newbie. It would be grateful if someone could help me.

[7LH0rse]

By the way, is there any connection between the error and the 2 warnings?

[7LH0rse]

Sorry : ) , it should be mpc_err_delete, not error.