Create a setting for comparing against a fixed build

tools/memap.py

@@ -5,7 +5,7 @@ from __future__ import print_function, division, absolute_import
 
 from abc import abstractmethod, ABCMeta
 from sys import stdout, exit, argv
-from os import sep
+from os import sep, rename
 from os.path import (basename, dirname, join, relpath, abspath, commonprefix,
                      splitext)
 import re
@@ -20,6 +20,7 @@ from jinja2.environment import Environment
 
 from .utils import (argparse_filestring_type, argparse_lowercase_hyphen_type,
                     argparse_uppercase_type)
+from .settings import COMPARE_FIXED
 
 
 class _Parser(object):
@@ -801,6 +802,8 @@ class MemapParser(object):
                     self.old_modules = parser().parse_mapfile(old_input)
             except IOError:
                 self.old_modules = None
+            if not COMPARE_FIXED:
+                rename(mapfile, "%s.old" % mapfile)
             return True
 
         except IOError as error:

tools/settings.py

@@ -58,6 +58,9 @@ MBED_ORG_USER = ""
 # Print compiler warnings and errors as link format
 PRINT_COMPILER_OUTPUT_AS_LINK = False
 
+# Compare against a fixed build of the project for space consumption
+COMPARE_FIXED = False
+
 # Print warnings/errors in color
 COLOR = False
 
@@ -91,7 +94,7 @@ for _n in _ENV_PATHS:
             print("WARNING: MBED_%s set as environment variable but doesn't"
                   " exist" % _n)
 
-_ENV_VARS = ['PRINT_COMPILER_OUTPUT_AS_LINK', 'COLOR']
+_ENV_VARS = ['PRINT_COMPILER_OUTPUT_AS_LINK', 'COLOR', 'COMPARE_FIXED']
 for _n in _ENV_VARS:
     value = getenv('MBED_%s' % _n)
     if value: