buildmode c-shared

foo.h

/* Created by "go tool cgo" - DO NOT EDIT. */

/* package github.com/bnagy/cshared */

/* Start of preamble from import "C" comments.  */




/* End of preamble from import "C" comments.  */


/* Start of boilerplate cgo prologue.  */

#ifndef GO_CGO_PROLOGUE_H
#define GO_CGO_PROLOGUE_H

typedef signed char GoInt8;
typedef unsigned char GoUint8;
typedef short GoInt16;
typedef unsigned short GoUint16;
typedef int GoInt32;
typedef unsigned int GoUint32;
typedef long long GoInt64;
typedef unsigned long long GoUint64;
typedef GoInt64 GoInt;
typedef GoUint64 GoUint;
typedef __SIZE_TYPE__ GoUintptr;
typedef float GoFloat32;
typedef double GoFloat64;
typedef __complex float GoComplex64;
typedef __complex double GoComplex128;

// static assertion to make sure the file is being used on architecture
// at least with matching size of GoInt.
typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];

typedef struct { char *p; GoInt n; } GoString;
typedef void *GoMap;
typedef void *GoChan;
typedef struct { void *t; void *v; } GoInterface;
typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;

#endif

/* End of boilerplate cgo prologue.  */

#ifdef __cplusplus
extern "C" {
#endif


extern GoInt64 Test();

#ifdef __cplusplus
}
#endif

gistfile1.go

package main

import "C"

// The export directive below doesn't work with a space between // and export!

//export Test
func Test() int64 {
	return 42
}

func main() {}

invocation

$ ls
foo.h  libfoo.so  test.c
$ clang test.c -pedantic -Weverything -lfoo -L. -o foo -Wl,-rpath,.

test.c

#include <stdio.h>
#include "foo.h"

int
main() {
  GoInt answer;
  answer = Test();
  printf("%lld\n", answer);
  return 0;
}