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, 4 insertions, 0 deletions

diff --git a/Tests/IncludeDirectories/SystemIncludeDirectories/systemlib.cpp b/Tests/IncludeDirectories/SystemIncludeDirectories/systemlib.cpp
new file mode 100644
index 0000000..f111bfa
--- /dev/null
+++ b/Tests/IncludeDirectories/SystemIncludeDirectories/systemlib.cpp
@@ -0,0 +1,4 @@
+
+#include "systemlib.h"
+
+int systemlib() { return 0; }