gyp: python3 fixes: utf8 decode, use of 'None' in eval

PR-URL: #1925
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

gyp/pylib/gyp/generator/make.py

@@ -1776,7 +1776,7 @@ def WriteMakeRule(self, outputs, inputs, actions=None, comment=None,
       # - The multi-output rule will have an do-nothing recipe.
 
       # Hash the target name to avoid generating overlong filenames.
-      cmddigest = hashlib.sha1(command if command else self.target).hexdigest()
+      cmddigest = hashlib.sha1((command or self.target).encode('utf-8')).hexdigest()
       intermediate = "%s.intermediate" % cmddigest
       self.WriteLn('%s: %s' % (' '.join(outputs), intermediate))
       self.WriteLn('\t%s' % '@:')

gyp/pylib/gyp/input.py

@@ -240,7 +240,7 @@ def LoadOneBuildFile(build_file_path, data, aux_data, includes,
     if check:
       build_file_data = CheckedEval(build_file_contents)
     else:
-      build_file_data = eval(build_file_contents, {'__builtins__': None},
+      build_file_data = eval(build_file_contents, {'__builtins__': {}},
                              None)
   except SyntaxError as e:
     e.filename = build_file_path
@@ -1094,7 +1094,7 @@ def EvalSingleCondition(
     else:
       ast_code = compile(cond_expr_expanded, '<string>', 'eval')
       cached_conditions_asts[cond_expr_expanded] = ast_code
-    if eval(ast_code, {'__builtins__': None}, variables):
+    if eval(ast_code, {'__builtins__': {}}, variables):
       return true_dict
     return false_dict
   except SyntaxError as e: