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, 14 insertions, 3 deletions

diff --git a/Source/cmTargetIncludeDirectoriesCommand.cxx b/Source/cmTargetIncludeDirectoriesCommand.cxx
index ee91521..e7b906c 100644
--- a/Source/cmTargetIncludeDirectoriesCommand.cxx
+++ b/Source/cmTargetIncludeDirectoriesCommand.cxx
@@ -84,10 +84,21 @@ void cmTargetIncludeDirectoriesCommand
                          const std::vector<std::string> &content,
                          bool prepend, bool system)
 {
+  cmTargetPropCommandBase::HandleInterfaceContent(tgt, content,
+                                                  prepend, system);
+
   if (system)
     {
-    // Error.
+    std::string joined;
+    std::string sep;
+    for(std::vector<std::string>::const_iterator it = content.begin();
+      it != content.end(); ++it)
+      {
+      joined += sep;
+      sep = ";";
+      joined += *it;
+      }
+    tgt->AppendProperty("INTERFACE_SYSTEM_INCLUDE_DIRECTORIES",
+                        joined.c_str());
     }
-  cmTargetPropCommandBase::HandleInterfaceContent(tgt, content,
-                                                  prepend, system);
 }