The Tor Browser / file revision

 import pymake.data

 import pymake.parser

 import pymake.parserdata

 import sys

 '''

 Modifies the output of Sun Studio's -xM to look more like the output

 of gcc's -MD -MP, adding phony targets for dependencies.

 '''

 def add_phony_targets(path):

     print path

     deps = set()

     targets = set()

     for stmt in pymake.parser.parsefile(path):

         if isinstance(stmt, pymake.parserdata.Rule):

             assert isinstance(stmt.depexp, pymake.data.StringExpansion)

             assert isinstance(stmt.targetexp, pymake.data.StringExpansion)

             for d in stmt.depexp.s.split():

                 deps.add(d)

             for t in stmt.targetexp.s.split():

                 targets.add(t)

     phony_targets = deps - targets

     if not phony_targets:

         return

     with open(path, 'a') as f:

         f.writelines('%s:\n' % d for d in phony_targets)

 if __name__ == '__main__':

     for f in sys.argv[1:]:

         add_phony_targets(f)