Add the INTERFACE_SYSTEM_INCLUDE_DIRECTORIES target property.

Unlike other target properties, this does not have a corresponding
non-INTERFACE variant.

This allows propagation of system attribute on include directories
from link dependents.

1 files changed, 2 insertions, 0 deletions

diff --git a/Source/cmGeneratorTarget.h b/Source/cmGeneratorTarget.h
index c0fd772..dedfa60 100644
--- a/Source/cmGeneratorTarget.h
+++ b/Source/cmGeneratorTarget.h
@@ -78,6 +78,8 @@ private:
   void ClassifySources();
   void LookupObjectLibraries();
 
+  std::map<std::string, std::vector<std::string> > SystemIncludesCache;
+
   cmGeneratorTarget(cmGeneratorTarget const&);
   void operator=(cmGeneratorTarget const&);
 };