问无法用.so链接到Mac上的CMake文件

EN

#include <stdio.h>
#import <mach-o/dyld.h>

int main( )
{
  int the_answer;
  int rc;                // Success or failure result value
  NSObjectFileImage img; // Represents the bundle's object file
  NSModule handle;       // Handle to the loaded bundle
  NSSymbol sym;          // Represents a symbol in the bundle

  int (*get_answer) (void);  // Function pointer for get_answer

  /* Get an object file for the bundle. */
  rc = NSCreateObjectFileImageFromFile("libanswer.bundle", &img);
  if (rc != NSObjectFileImageSuccess) {
    fprintf(stderr, "Could not load libanswer.bundle.\n");
    exit(-1);
  }

  /* Get a handle for the bundle. */
  handle = NSLinkModule(img, "libanswer.bundle", FALSE);

  /* Look up the get_answer function. */
  sym = NSLookupSymbolInModule(handle, "_get_answer");
  if (sym == NULL)
  {
    fprintf(stderr, "Could not find symbol: _get_answer.\n");
    exit(-2);
  }

  /* Get the address of the function. */
  get_answer = NSAddressOfSymbol(sym);

  /* Invoke the function and display the answer. */
  the_answer = get_answer( );
  printf("The answer is... %d\n", the_answer);

  fprintf(stderr, "%d??!!\n", the_answer);
  return 0;
}