Patch of cpplint to detect mixture uses of tabs and spaces for indent

cpplint-mixture-indent.patch

diff --git a/cpplint.py b/cpplint.py
index 95c0c32..b8cabad 100755
--- a/cpplint.py
+++ b/cpplint.py
@@ -4466,6 +4466,9 @@ def CheckStyle(filename, clean_lines, linenum, file_extension, nesting_state,
   if line.find('\t') != -1:
     error(filename, linenum, 'whitespace/tab', 1,
           'Tab found; better to use spaces')
+  if Match('^\s* \t', line) or Match('^\s*\t    ', line):
+    error(filename, linenum, 'whitespace/indent', 1,
+          'Indent with mixture of tabs and spaces is not allowed')

   # One or three blank spaces at the beginning of the line is weird; it's
   # hard to reconcile that with 2-space indents.