package.py : extra arguments, fixed inheritance issue

- added attribute to hold extra arguments in PackageBase instances
- fixed registration from within packages
- examples : hdf5, lzo

lib/spack/spack/package.py

@@ -40,6 +40,8 @@
 import time
 import functools
 import inspect
+import copy
+
 from StringIO import StringIO
 from urlparse import urlparse
 
@@ -135,7 +137,17 @@ def _append_checks(check_name):
             checks = getattr(meta, attr_name)
             if checks:
                 for phase_name, funcs in checks.items():
-                    phase = attr_dict.get(PackageMeta.phase_fmt.format(phase_name))
+                    try:
+                        # Search for the phase in the attribute dictionary
+                        phase = attr_dict[PackageMeta.phase_fmt.format(phase_name)]
+                    except KeyError:
+                        # If it is not there it's in the bases
+                        # and we added a check. We need to copy
+                        # and extend
+                        for base in bases:
+                            phase = getattr(base, PackageMeta.phase_fmt.format(phase_name), None)
+                        attr_dict[PackageMeta.phase_fmt.format(phase_name)] = copy.deepcopy(phase)
+                        phase = attr_dict[PackageMeta.phase_fmt.format(phase_name)]
                     getattr(phase, check_name).extend(funcs)
                 # Clear the attribute for the next class
                 setattr(meta, attr_name, {})
@@ -511,6 +523,8 @@ def __init__(self, spec):
         if self.is_extension:
             spack.repo.get(self.extendee_spec)._check_extendable()
 
+        self.extra_args = {}
+
     @property
     def package_dir(self):
         """Return the directory where the package.py file lives."""