Errors with MPC

[CaptainZidgel]

Has their been a change in mpc syntax since the last website update? Trying to follow tutorial and running into an issue at chapter 6, trying to run the following code:

#include <stdio.h>
#include <stdlib.h>
#include <editline/readline.h>
#include <editline/history.h>
#include "mpc.h"

static char input[2048];

int main() {
	mpc_parser_t* Number = mpc_new("number");
	mpc_parser_t* Operator = mpc_new("operator");
	mpc_parser_t* Expr = mpc_new("expr");
	mpc_parser_t* Lispy = mpc_new("lispy");

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

	puts("v 0.0");
	puts("Press Ctrl+c to Exit\n");
	
	while (1) {
		char* input = readline("* ");
		add_history(input);
		printf("You've just inp't %s", input);
		free(input);
		/* Poopy */
		mpc_result_t r;
		if (mpc_parse("<stdin>", input, Lispy, &r)) {
			mpc_ast_print(r.output);
			mpc_ast_delete(r.output);
		} else {
			mpc_ast_print(r.error);
			mpc_ast_delete(r.error);
		}

	}

	mpc_cleanup(4, Number, Operator, Expr, Lispy);
	return 0;
}

Running this command... cc -std=c99 -Wall thing.c mpc.c -ledit -lm -o thing.out (Using the file name 'thing' instead of 'parsing' as is used in the tutorial)

                 from mpc.h:1,
                 from thing.c:5:
mpc.h:927:29: error: conflicting types for ‘mpc_pdata_string_t’
 typedef struct { char *x; } mpc_pdata_string_t;
                             ^~~~~~~~~~~~~~~~~~
In file included from mpc.h:1:0,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from thing.c:5:
mpc.h:927:29: note: previous declaration of ‘mpc_pdata_string_t’ was here
 typedef struct { char *x; } mpc_pdata_string_t;
                             ^~~~~~~~~~~~~~~~~~
In file included from mpc.h:1:0,
                 from mpc.h:1,
                 from mpc.h:1,
                 from thing.c:5:
mpc.h:928:18: error: unknown type name ‘mpc_parser_t’
 typedef struct { mpc_parser_t *x; mpc_apply_t f; } mpc_pdata_apply_t;
                  ^~~~~~~~~~~~
mpc.h:928:35: error: unknown type name ‘mpc_apply_t’
 typedef struct { mpc_parser_t *x; mpc_apply_t f; } mpc_pdata_apply_t;
                                   ^~~~~~~~~~~
mpc.h:928:52: error: conflicting types for ‘mpc_pdata_apply_t’
 typedef struct { mpc_parser_t *x; mpc_apply_t f; } mpc_pdata_apply_t;
                                                    ^~~~~~~~~~~~~~~~~
In file included from mpc.h:1:0,
                 from mpc.h:1,
                 from mpc.h:1,
                 from thing.c:5:
mpc.h:928:52: note: previous declaration of ‘mpc_pdata_apply_t’ was here
 typedef struct { mpc_parser_t *x; mpc_apply_t f; } mpc_pdata_apply_t;
                                                    ^~~~~~~~~~~~~~~~~
In file included from mpc.h:1:0,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from thing.c:5:
mpc.h:929:18: error: unknown type name ‘mpc_parser_t’
 typedef struct { mpc_parser_t *x; mpc_apply_to_t f; void *d; } mpc_pdata_apply_to_t;
                  ^~~~~~~~~~~~
mpc.h:929:35: error: unknown type name ‘mpc_apply_to_t’
 typedef struct { mpc_parser_t *x; mpc_apply_to_t f; void *d; } mpc_pdata_apply_to_t;
                                   ^~~~~~~~~~~~~~
mpc.h:929:64: error: conflicting types for ‘mpc_pdata_apply_to_t’
 typedef struct { mpc_parser_t *x; mpc_apply_to_t f; void *d; } mpc_pdata_apply_to_t;
                                                                ^~~~~~~~~~~~~~~~~~~~
In file included from mpc.h:1:0,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from thing.c:5:
mpc.h:929:64: note: previous declaration of ‘mpc_pdata_apply_to_t’ was here
 typedef struct { mpc_parser_t *x; mpc_apply_to_t f; void *d; } mpc_pdata_apply_to_t;
                                                                ^~~~~~~~~~~~~~~~~~~~
In file included from mpc.h:1:0,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1,
                 from mpc.h:1, //had to subtract about a couple dozen of these from every error "block"
                 from thing.c:5:
mpc.h:930:18: error: unknown type name ‘mpc_parser_t’
 typedef struct { mpc_parser_t *x; mpc_dtor_t dx; mpc_check_t f; char *e; } mpc_pdata_check_t;
                  ^~~~~~~~~~~~
mpc.h:930:35: error: unknown type name ‘mpc_dtor_t’
 typedef struct { mpc_parser_t *x; mpc_dtor_t dx; mpc_check_t f; char *e; } mpc_pdata_check_t;
                                   ^~~~~~~~~~
mpc.h:930:50: error: unknown type name ‘mpc_check_t’
 typedef struct { mpc_parser_t *x; mpc_dtor_t dx; mpc_check_t f; char *e; } mpc_pdata_check_t;
                                                  ^~~~~~~~~~~
mpc.h:930:76: error: conflicting types for ‘mpc_pdata_check_t’
 struct { mpc_parser_t *x; mpc_dtor_t dx; mpc_check_t f; char *e; } mpc_pdata_check_t;
                                                                    ^~~~~~~~~~~~~~~~~

This is just a small sample, as I suspect the actual console output would be a mile long...

[orangeduck]

Hi @Coolster4000,

I'm not sure what could be wrong and I can't seem to reproduce it but you could try getting the newest version of mpc from the github repo.

Dan