[protobuf] Linker issues: undefined reference to `a_message__get_packed_size'

[Suhail Doshi]

I am using the protobuf-c extension out there.

Getting the following errors:

gcc tut.c tut.pb-c.c -o tut -lprotobuf-c -lprotobuf -lpthread

/tmp/ccBHwTBl.o: In function `main':
tut.c:(.text+0xab): undefined reference to
`a_message__get_packed_size'
tut.c:(.text+0xcc): undefined reference to `a_message__pack'
collect2: ld returned 1 exit status

tut.c
----------------
#include "tut.pb-
c.h"
#include
<stdio.h>
#include
<stdlib.h>

int main(int argc, char **argv)
{
    AMessage msg =
AMESSAGE__INIT;
    void
*buf;

    unsigned
len;

    if (argc < 2 || argc > 3)
{
        fprintf(stderr, "usage: pack a [b]
\n");
        return
1;
    }

    msg.a =
atoi(argv[1]);
    if (argc == 3)
{
        msg.has_b =
1;
        msg.b =
atoi(argv[2]);
    }

    len =
a_message__get_packed_size(&msg);
    buf =
malloc(len);
    a_message__pack(&msg,
buf);
    fwrite(buf, len, 1,
stdout);

    return
0;
}

tut-pb-c.h
------------------------------------------

/* Generated by the protocol buffer compiler.  DO NOT EDIT! */

#ifndef PROTOBUF_C_tut_2eproto__INCLUDED
#define PROTOBUF_C_tut_2eproto__INCLUDED

#include <google/protobuf-c/protobuf-c.h>

PROTOBUF_C_BEGIN_DECLS


typedef struct _AMessage AMessage;


/* --- enums --- */


/* --- messages --- */

struct  _AMessage
{
  ProtobufCMessage base;
  int32_t a;
  protobuf_c_boolean has_b;
  int32_t b;
};
#define AMESSAGE__INIT \
 { PROTOBUF_C_MESSAGE_INIT (&amessage__descriptor) \
    , 0, 0,0 }


/* AMessage methods */
void   amessage__init
                     (AMessage         *message);
size_t amessage__get_packed_size
                     (const AMessage   *message);
size_t amessage__pack
                     (const AMessage   *message,
                      uint8_t             *out);
size_t amessage__pack_to_buffer
                     (const AMessage   *message,
                      ProtobufCBuffer     *buffer);
AMessage *
       amessage__unpack
                     (ProtobufCAllocator  *allocator,
                      size_t               len,
                      const uint8_t       *data);
void   amessage__free_unpacked
                     (AMessage *message,
                      ProtobufCAllocator *allocator);
/* --- per-message closures --- */

typedef void (*AMessage_Closure)
                 (const AMessage *message,
                  void *closure_data);

/* --- services --- */


/* --- descriptors --- */

extern const ProtobufCMessageDescriptor amessage__descriptor;

PROTOBUF_C_END_DECLS


#endif  /* PROTOBUF_tut_2eproto__INCLUDED */

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