Change lookup path for Dart native extensions shared libraries.

runtime/bin/extensions_linux.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 "bin/extensions.h"
 #include <dlfcn.h>
 
-void* Extensions::LoadExtensionLibrary(const char* library_name) {
-  const char* strings[4] = { "./lib", library_name, ".so", NULL };
-  char* library_path = Concatenate(strings);
-  void* lib_handle = dlopen(library_path, RTLD_LAZY);
-  free(library_path);
+void* Extensions::LoadExtensionLibrary(const char* library_path,
+                                       const char* extension_name) {
+  const char* strings[5] = { library_path, "/lib",

[Mads Ager (google), 2012/03/15 08:44:09]

Does this work if library_path is the empty string?

[Bill Hesse, 2012/03/15 13:08:54]

The library_path should always be an absolute file path.  This is checked in
LoadExtension in extensions.cc.

On 2012/03/15 08:44:09, Mads Ager wrote:

+                             extension_name, ".so", NULL };
+  char* library_file = Concatenate(strings);
+  void* lib_handle = dlopen(library_file, RTLD_LAZY);
+  free(library_file);
   return lib_handle;
 }
 
 void* Extensions::ResolveSymbol(void* lib_handle, const char* symbol) {
   void* result = dlsym(lib_handle, symbol);
   if (dlerror() != NULL) return NULL;
   return result;
 }