--- clang.orig/tools/scan-build/ccc-analyzer	2015-07-02 00:35:29.000000000 +0200
+++ clang/tools/scan-build/ccc-analyzer		2015-10-28 23:13:42.538854405 +0100
@@ -579,7 +579,7 @@
   }
 
   # Compile mode flags.
-  if ($Arg =~ /^-[D,I,U,isystem](.*)$/) {
+  if ($Arg =~ /^-(?:[DIU]|isystem)(.*)$/) {
     my $Tmp = $Arg;
     if ($1 eq '') {
       # FIXME: Check if we are going off the end.