Cycles:

* Compute MD5 hash to deal with nvidia opencl compiler cache not recognizing
  changes in #included files, makes it possible to do kernel compile only
  once and remember it for the next time blender is started.
* Kernel tweak to compile with ATI/linux. Enabling any more functionality than
  simple clay render still chokes the compiler though, without a specific error
  message ..

intern/cycles/util/util_path.h

@@ -35,6 +35,8 @@ string path_filename(const string& path);
 string path_dirname(const string& path);
 string path_join(const string& dir, const string& file);
 
+string path_files_md5_hash(const string& dir);
+
 CCL_NAMESPACE_END
 
 #endif