From 4557c8db4813b4198fb7d64249e104bdcb828ae5 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Thu, 20 Sep 2012 23:22:59 +0200
Subject: [PATCH] Don't prepend a path before generator expressions in
 include_directories.

---
 Source/cmIncludeDirectoryCommand.cxx | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/Source/cmIncludeDirectoryCommand.cxx b/Source/cmIncludeDirectoryCommand.cxx
index 4dd98a16c..11c5f4e9c 100644
--- a/Source/cmIncludeDirectoryCommand.cxx
+++ b/Source/cmIncludeDirectoryCommand.cxx
@@ -105,10 +105,13 @@ void cmIncludeDirectoryCommand::AddDirectory(const char *i,
     cmSystemTools::ConvertToUnixSlashes(ret);
     if(!cmSystemTools::FileIsFullPath(ret.c_str()))
       {
-      std::string tmp = this->Makefile->GetStartDirectory();
-      tmp += "/";
-      tmp += ret;
-      ret = tmp;
+      if(ret[0] != '$' && ret[1] != '<')
+        {
+        std::string tmp = this->Makefile->GetStartDirectory();
+        tmp += "/";
+        tmp += ret;
+        ret = tmp;
+        }
       }
     }
   this->Makefile->AddIncludeDirectory(ret.c_str(), before);