Don't generate LASTCHANGE at build time.

tools/export_tarball/export_tarball.py

Index: tools/export_tarball/export_tarball.py
diff --git a/tools/export_tarball/export_tarball.py b/tools/export_tarball/export_tarball.py
index 861503eec64991bd88b1f6cfa8f0e84e16babbc1..cc599c3ebfa1ccd33708d0c3caa67d470561bd01 100755
--- a/tools/export_tarball/export_tarball.py
+++ b/tools/export_tarball/export_tarball.py
@@ -101,6 +101,11 @@ def main(argv):
     print 'Cannot find the src directory.'
     return 1
 
+  if subprocess.call(['python', 'build/util/lastchange.py', '-o',

[Paweł Hajdan Jr., 2012/05/25 18:49:35]

This is introducing code duplication. I appreciate that you remember about
export_tarball.py (thanks!), but I'm afraid most people have no idea it even
exists.

Will this really result in build errors in build/util/LASTCHANGE file is not
present? If so, I'd prefer making that non-fatal.

+                      'build/util/LASTCHANGE'], cwd=GetSourceDirectory()) != 0:
+    print 'Could not run build/util/lastchange.py to update LASTCHANGE.'
+    return 1
+
   output_fullname = args[0] + '.tar.bz2'
   output_basename = os.path.basename(args[0])