Change lookup path for Dart native extensions shared libraries.

runtime/bin/extensions_linux.cc

Index: runtime/bin/extensions_linux.cc
diff --git a/runtime/bin/extensions_linux.cc b/runtime/bin/extensions_linux.cc
index df4df5895e30641075aff47ad42173554576a4ea..e0c65740bb0a9d2202547e6321281e72a05d521b 100644
--- a/runtime/bin/extensions_linux.cc
+++ b/runtime/bin/extensions_linux.cc
@@ -5,11 +5,13 @@
 #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;
 }