Resolve the executable path on Mac OS when sym-linked

runtime/bin/platform_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include <mach-o/dyld.h>
 
+#include "bin/file.h"
 #include "bin/platform.h"
 
 #include <crt_externs.h>  // NOLINT
 #include <signal.h>  // NOLINT
 #include <string.h>  // NOLINT
 #include <unistd.h>  // NOLINT
 
 #include "bin/fdutils.h"
 
 
@@ skipping 64 matching lines @@
   char* path = NULL;
   if (_NSGetExecutablePath(path, &path_size) == 0) {
     return NULL;
   }
   // Allocate buffer and get executable path.
   path = reinterpret_cast<char*>(malloc(path_size));
   if (_NSGetExecutablePath(path, &path_size) != 0) {
     free(path);
     return NULL;
   }
-  return path;
+  // Return the canonical path as the returned path might contain symlinks.
+  char* canon_path = File::GetCanonicalPath(path);
+  free(path);
+  return canon_path;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)