aggregate has incomplete type and cannot be defined

Question

I've been stumped over this one:

SpanLogger_c.h

#ifndef SPANLOGGERCH
#define SPANLOGGERCH

struct CSpan
{
    int64_t trace_id;
};

#endif

main.c

#include "SpanLogger_c.h"

int main(int argc, char * const argv[]) {
  struct CSpan span;
}

compilation command:

g++ -g -I. main.c 

I get this error

main.c: In function ‘int main(int, char* const*)’:
main.c:7: error: aggregate ‘CSpan span’ has incomplete type and cannot be defined

Anybody help?

Answer 1

In SpanLogger_c.h:

#include <stdint.h> 

If you're intending to write C++ use:

#include <cstdint>