Add "make bloatcheck" to run Matt Mackall's bloat-o-meter. Copy an old

busybox_unstripped to busybox_old, build a new version, and "make bloatcheck"
to see a detailed breakdown of the size difference.

Makefile

@@ -132,6 +132,8 @@ help:
 	@echo '  uninstall'
 	@echo
 	@echo 'Development:'
+	@echo '  bloatcheck             - show size difference between busybox_unstripped'
+	@echo '                           and busybox_old
 	@echo '  check			- run the test suite for all applets'
 	@echo '  checkhelp		- check for missing help-entries in Config.in'
 	@echo '  randconfig		- generate a random configuration'
@@ -358,6 +360,9 @@ checkhelp:
 .PHONY: sizes
 sizes: busybox_unstripped
 	$(NM) --size-sort $(<)
+.PHONY: bloatcheck
+bloatcheck: busybox_old busybox_unstripped
+	@scripts/bloat-o-meter busybox_old busybox_unstripped
 
 .PHONY: objsizes
 objsizes: busybox_unstripped

scripts/bloat-o-meter

@@ -0,0 +1,60 @@
+#!/usr/bin/python
+#
+# Copyright 2004 Matt Mackall <mpm@selenic.com>
+#
+# inspired by perl Bloat-O-Meter (c) 1997 by Andi Kleen
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
+import sys, os, re
+
+if len(sys.argv) != 3:
+    sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
+    sys.exit(-1)
+
+def getsizes(file):
+    sym = {}
+    for l in os.popen("nm --size-sort " + file).readlines():
+        size, type, name = l[:-1].split()
+        if type in "tTdDbB":
+            if name.find(".") != -1: name = "static." + name.split(".")[0]
+            if name in sym: sym[name] += int(size, 16)
+            else :sym[name] = int(size, 16)
+    return sym
+
+old = getsizes(sys.argv[1])
+new = getsizes(sys.argv[2])
+grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
+delta, common = [], {}
+
+for a in old:
+    if a in new:
+        common[a] = 1
+
+for name in old:
+    if name not in common:
+        remove += 1
+        down += old[name]
+        delta.append((-old[name], name))
+
+for name in new:
+    if name not in common:
+        add += 1
+        up += new[name]
+        delta.append((new[name], name))
+
+for name in common:
+        d = new.get(name, 0) - old.get(name, 0)
+        if d>0: grow, up = grow+1, up+d
+        if d<0: shrink, down = shrink+1, down-d
+        delta.append((d, name))
+
+delta.sort()
+delta.reverse()
+
+print "add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
+      (add, remove, grow, shrink, up, -down, up-down)
+print "%-40s %7s %7s %+7s" % ("function", "old", "new", "delta")
+for d, n in delta:
+    if d: print "%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d)